JP2003324690A - Video recording and playback device - Google Patents

Abstract

(57) [Problem] To provide a video recording / reproducing apparatus capable of performing special reproduction of video data at a stable reproduction speed. The video data stream includes a plurality of video data having time information indicating a playback time, and each video data is arranged in chronological order of the playback time of the video data. A video recording / reproducing apparatus 100 that selects each video data in the order of the reproduction time at a specific reproduction time interval, decodes and reproduces each selected video data, and every time the video data is selected, The decoding processing efficiency of the selected video data is measured, and each time the decoding processing efficiency is measured, the reproduction time interval for selecting video data from the video data stream is determined based on the measured decoding processing efficiency value. A video recording / reproducing apparatus comprising a control unit 112 for adjusting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording / reproducing apparatus for recording and reproducing a transport stream in which video data is multiplexed according to the MPEG2 standard, and more particularly to a technique for special reproduction such as fast-forwarding of the recorded stream.

[0002]

2. Description of the Related Art In recent years, with the spread of digital broadcasting and the increase in storage capacity of recording media, video data encoded by inter-frame prediction, such as MPEG2-transport stream, is recorded and reproduced on the storage medium. A video recording / playback device that can do this has appeared. As one of the techniques used in such a video recording / reproducing apparatus, there is a technique called special reproduction such as fast-forward or reverse reproduction.

A moving image reproduced in the normal reproduction is an I picture including all video data necessary for reproducing a frame which is a still image which is a constituent unit of the moving image,
It is composed of a P picture that includes video data that is the difference from the previous frame and a B picture that contains video data that is the difference from the previous and subsequent frames (hereinafter, the above three types of pictures are collectively referred to as a "picture". .).

In the normal reproduction, 30 pictures are generally reproduced per second, whereas in the special reproduction, the video data to be reproduced is composed of only I pictures and has 7.5 to 3 pictures per second. About I pictures are reproduced. FIG. 11 shows an example of a video data stream reproduced in normal reproduction and special reproduction (fast forward). Each numbered quadrangle indicates each picture forming the video data stream, the number attached to each quadrangle indicates the time-series order of each picture, and the shaded quadrangle indicates an I picture. For simplification of explanation, it is assumed that the number of pictures reproduced per second is 6 in both normal reproduction and special reproduction. As shown in FIG. 11, in the normal reproduction, the pictures are reproduced in order, whereas in the special reproduction at the reproduction speed of 3 times, only one of the three pictures is reproduced. In the special reproduction at the reproduction speed of 6 times, only one of the six images is reproduced. By extracting and reproducing a specific picture in this way, special reproduction such as fast-forwarding and reverse reproduction is realized.

FIG. 12 shows a flowchart of a trick play process performed by the video recording / playback apparatus. Below, Figure 1
The special reproduction process will be described with reference to 2. When the picture reproduction timing arrives, the video recording / reproducing apparatus sets a timer for measuring the reproduction timing of the picture to be reproduced next (1201), and the I-picture stored in the buffer memory of the video recording / reproducing apparatus. 1 is decoded and reproduced (1202). After playback, from the video data stream recorded on the recording medium of the video recording device,
An I picture is searched for and read (1203), written in the buffer memory, and it is determined whether or not a preset number of I pictures are stored in the buffer memory (step S1204).

Here, since the time required to read the I picture from the recording medium is not constant and may be delayed, the writing of the I picture into the buffer memory is delayed due to the read delay, and the I picture to be reproduced may be delayed. In order to eliminate the problem that the number is insufficient, the video recording / reproducing apparatus is controlled so that a predetermined number of I pictures are always stored in the buffer memory in advance.

If not stored (step S120)
4: N), the next I picture is read from the recording medium (step S1203), written in the buffer memory, and the process of step S1204 is performed. If it is stored (step S1204: Y), the trick play process ends. By executing the special reproduction process in the video recording / reproducing apparatus, the user can record the recorded video data.
You can enjoy not only normal playback but also special playback such as fast-forwarding and enjoy the played video.

[0008]

[Patent Document 1] Japanese Patent Application No. 11-275967

[0009]

[Patent Document 2] Japanese Patent Application No. 11-335709

[0010]

[Patent Document 3] Japanese Patent Application No. 11-187030

[0011]

However, the processing in the special reproduction requires the processing to retrieve the I picture for each picture, and when reproducing the picture, the transfer control from the recording medium to the buffer memory is performed for each picture. It is necessary to control the decoding of the transferred I picture, and when the processing load is large compared to the normal reproduction and the processing load is increased, the conventional video recording / reproducing apparatus causes a delay in the reproduction of the video, and There is a problem that the reproduction speed is delayed and the reproduction cannot be performed at the special reproduction speed specified by the user, so that the user cannot enjoy the special reproduction at a stable speed.

In view of the above problems, it is an object of the present invention to provide a video recording / reproducing apparatus capable of performing special reproduction of video data at a stable reproduction speed.

[0013]

In order to solve the above-mentioned problems, according to the present invention, a video data stream is composed of a plurality of video data having time information indicating a reproduction time, and each video data reproduces the video data. A video playback device for selecting video data to be played back from the video data stream arranged in order of time according to a playback time order at a specific playback time interval, and decoding and playing each selected video data. Measuring means for measuring the decoding processing efficiency of the selected video data each time the video data is selected, and selecting the video data to be reproduced from the video data stream each time the decoding processing efficiency is measured. Adjusting means for adjusting the reproduction time interval for adjusting the reproduction time interval based on the measured value of the decoding processing efficiency.

In the present invention, the video data stream is
Each video data is reproduced at a specific reproduction time interval from the video data stream composed of a plurality of video data having time information indicating a reproduction time, and each video data is arranged in the order of the reproduction time of the video data. A method of reproducing in a video recording / reproducing apparatus for selecting and decoding each selected video data according to the order of, and measuring the decoding processing efficiency of the selected video data every time the video data is selected. And a step of adjusting the reproduction time interval for selecting video data from the video data stream based on the measured value of the decoding processing efficiency every time the decoding processing efficiency is measured. Can be characterized.

In the present invention, the video data stream is
Each video data is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged at a specific playback time interval from the video data stream in which the video data is arranged in the order of the playback time of the video data. A program used in a video recording / reproducing apparatus for selecting in accordance with the order and decoding and reproducing each selected video data, wherein the program is a decoding processing efficiency of the selected video data every time the video data is selected. And a step of adjusting the reproduction time interval for selecting video data from the video data stream based on the measured decoding efficiency every time the decoding efficiency is measured. It can be characterized by including and.

Further, according to the present invention, the video data stream is
Each video data is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged at a specific playback time interval from the video data stream in which the video data is arranged in the order of the playback time of the video data. A computer-readable recording medium that records a program used in a video recording / reproducing apparatus that selects in accordance with the order, and decodes and reproduces each selected video data, wherein the program is selected every time the video data is selected. A measuring step for measuring the decoding processing efficiency of the selected video data, and the decoding processing efficiency for measuring the reproduction time interval for selecting the video data from the video data stream every time the decoding processing efficiency is measured. And adjusting step based on the value of.

As a result, the reproduction time interval of the video data from the video data stream to be specially reproduced is adjusted in association with the fluctuation of the decoding processing efficiency, so that the decoding processing efficiency of the video reproduction recording apparatus is improved during the special reproduction. Even if it decreases, the delay of the time required from the start to the end of the reproduction of the video data stream to be specially reproduced can be reduced by adjusting the reproduction time interval of the video data to be wide. .

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <Structure> FIG. 1 is a functional block diagram showing a structure of a video recording / reproducing apparatus 100 according to an embodiment of the present invention. The video recording / reproducing apparatus 100 includes an operation unit 1
10, tuner section 111, control section 112, first picture selection section 113, second picture selection section 114, buffer 1
15, recording medium 116, decoding unit 117, display unit 11
It is composed of 8. The video recording / reproducing apparatus 100 is composed of a CPU, a ROM, a RAM, a hard disk, a decoder, and the like as hardware. A computer program is stored in the ROM or the hard disk, and the CPU operates according to the computer program. The video recording / playback apparatus realizes its function.

The operation unit 110 receives an instruction of a program to be received, an instruction of a reproduction mode, an instruction of a special reproduction start of video data, an instruction of a special reproduction speed, and the like from the user, and outputs the received instruction to the control unit 112. The tuner section 111 is
When a transport stream (hereinafter, referred to as “TS”) in which video data is multiplexed according to the MPEG2 standard is input to the video recording / reproducing apparatus 100, video data forming a program pre-specified by the user is extracted,
The extracted video data is recorded on the recording medium 116 via the buffer 115.

The recording medium 116 records a video data stream, a position information list and a frame rate list. The video data stream recorded in the recording medium 116 is not limited to the one extracted by the tuner unit 111, and may be one input from an external device via an IEEE1394 interface or the like.

FIG. 2 is a conceptual diagram showing the correspondence between the structure of the position information list recorded on the recording medium 116 and the video data stream. FIG. 2A shows a part of the structure of the video data stream. The video data stream is a GOP (Group of Pictur) 712.
e) It is composed of video data groups organized in units.

Here, "GOP" is a video data group unit for performing moving picture compression, and is usually 0.
One group of GOPs is configured by one picture (about 15 pictures) required for displaying a moving image for 5 seconds, and each group unit includes an I picture indicated by 719 at the head. This allows any G on the stream
Playback can be started from OP.

An SH (sequence header) 711 is attached immediately before each GOP, and the reproduction start position of the video data stream recorded on the recording medium 116 can be determined based on the SH. In FIG. 2B,
7 shows each position information list recorded on the recording medium 116 in association with each SH and I picture of the video data stream. Each position information list is shown by 700.

The “positional information list” means each SH and I in the video data stream generated by the control unit 112 when the video data stream is transferred to the recording medium 116 via the buffer 115 and recorded. Information including position information indicating the position of the picture by the number of bytes of data transferred from the SH located at the beginning and time information indicating the STC (System Time Clock) count at the time of recording each SH and I picture List means SH
And I picture position information are indicated by 701 and 708, respectively, and SH and I picture time information are indicated by 702 and 702, respectively.
709.

MPEG-2 is used for each SH and each picture.
Each SH in the video data stream according to the standard
And a start code indicating the start position of the picture and a PCT (Picture Coding Type) code indicating the type of each picture. Based on the start code and the PCT code, the start point of each SH and I picture in the video data stream and The end point is detected by the control unit 112,
The number of transfer bytes from the beginning of the video data stream to the start point and end point of each SH and I picture is recorded in the position information list.

FIG. 3 shows a specific example of the contents of the position information list. Note that the position information is transferred T instead of the number of transfer bytes.
It may be indicated by the number of S packets. Further, the time information may be indicated by a difference value from the STC count number in the immediately preceding SH and I picture.

By using the position information list, the SH and I pictures at the time of special reproduction can be searched, so that the special reproduction can be efficiently performed as compared with the case of performing the special reproduction by directly analyzing the stream. In addition, the reproduction time in the stream and the remaining reproduction time can be calculated during the normal reproduction and the special reproduction, and the user can know the current reproduction time and the reproduction time until the end of the stream.

FIG. 10 shows an example of a screen display during special reproduction. At the time of special reproduction, a special reproduction mode (fast forward, reverse reproduction, etc.), reproduction speed 551, reproduction time 552 of the stream being reproduced, and remaining reproduction time 553 are displayed on the screen 550. Further, the “frame rate list” is a frame to be selected by the control unit 112 in the I-picture extraction interval adjustment processing, which will be described later and is set for each special playback speed that can be set in the video recording / playback apparatus 100. A list of rates.

FIG. 4 shows a specific example of the frame rate list. For convenience of explanation, FIG. 4 shows only a specific example of the frame list when the reproduction speed is 10 times speed, and omits specific examples of the frame list when the reproduction speed is other than that. Figure 4
As shown in, the maximum and minimum values are set for the frame rate to be selected.
When the maximum frame rate is selected by the control unit 112 and thereafter the frame rate increase process is performed in the I picture extraction interval adjustment process, the control unit 1
The frame rate for increase processing corresponding to the frame rate selected immediately before is selected by 12 (for example, when the frame rate selected immediately before is “20”, “2
5 ”is selected) and the frame rate reduction processing is performed, the reduction processing frame rate corresponding to the frame rate selected immediately before by the control unit 112 is selected (for example, the frame rate selected immediately before). Is "2
In the case of "0", "15" is selected).

This makes it possible to increase or decrease the frame rate stepwise. The control unit 112 performs a process of adjusting the reproduction speed of the video data during special reproduction.
Specifically, the time interval at which each I picture recorded in the buffer 115 is decoded and the read time of each I picture from the recording medium 116 are measured, and the I picture corresponding to each measured time interval and read time is measured. The frame rate is selected from the frame rate list recorded in the recording medium 116, the selected frame rate is notified to the first picture selecting unit 113 and the second picture selecting unit 114, and recorded in the buffer 115 or the recording medium 116. A process of adjusting the interval for selecting I pictures in the displayed video data stream to an interval according to the notified frame rate (hereinafter, referred to as "I picture selection interval adjusting process") is performed.

The control unit 112, when notifying the selected frame rate to the first picture selection unit 113 and the second picture selection unit 114 respectively, matches the reproduction speed designated by the user at the start of special reproduction. To notify you. The details of the I picture selection interval adjustment processing performed by the control unit 112 will be described later.

The first picture selection unit 113 includes a control unit 11
When the special playback speed and frame rate are notified from 2,
In the video data stream recorded on the recording medium 116, the time interval (T) for selecting the I picture based on the time information of the position information list is shown below based on the notified special reproduction speed and frame rate. It is calculated by the calculation formula (1).

Time interval (T) for selecting I picture = playback speed / frame rate (1) First picture selection unit 1
By referring to the position information list recorded on the recording medium 116, 13 indicates the I picture selected immediately before (when there is no immediately selected I picture, the position information list has the smallest byte of position information). STC obtained by adding the STC count number corresponding to the calculated time interval to the STC count number of the first I picture indicating the number)
The I picture having the STC count number closest to the count number is selected, the position of the I picture in the video data stream recorded on the recording medium 116 is specified based on the position information of the I picture, and the I picture is selected. Is read from the video data stream, a read completion signal is notified to the control unit 112, and the read I picture is transferred to the buffer 115 and recorded.

Here, the I picture selection process performed by the first picture selection unit 113 when the frame rate notified from the control unit 112 is the increase processing frame rate is referred to as "first frame rate increase process". Also, the first picture selection unit 113, every time an I picture is recorded in the buffer 115, the buffer 11 for the I picture to be recorded next.
5 holds the buffer position information indicating the storage position in 5 and the position information in the position information list of the recorded I picture, and when the special reproduction speed and the frame rate are notified from the control unit 112, the buffer position information is set to the control unit 112.
To notify.

The second picture selection unit 114 has the buffer 1
In the video data stream of each I picture recorded in 15, each I picture to be decoded is
The time interval (T) selected based on the reproduction time added to the picture is calculated based on the special reproduction speed and the frame rate notified from the control unit 112, and the calculation formula (1) is used.
For each I picture recorded in the buffer 115, the STC count number of each reproduction time indicated by the time difference from the reproduction time of the immediately preceding I picture is sequentially detected from the head I picture of the buffer 115. By sequentially adding the detected STC count number of each reproduction time from the beginning, the cumulative reproduction time interval from the first I picture is calculated for each I picture, and the cumulative reproduction time interval is calculated by the above formula ( The I picture closest to the STC count number corresponding to the time interval T calculated in 1) is selected, the selected I picture is read from the buffer 115 and output to the decoding unit 117.

Here, when the frame rate notified from the control unit 112 is the increase processing frame rate, the I picture selection processing performed by the second picture selection unit 114 is referred to as "second frame rate increase processing". Further, when the selection of the final I picture is completed, the second picture selection unit 114 notifies the control unit 112 of the completion of selection.

The buffer 115 temporarily records the video data stream input from the tuner section 111 and the I picture transferred from the recording medium 116. The decoding unit 117 decodes the I picture input by the second picture selection unit 114, reproduces it, and outputs it to the display unit 118. FIG. 5 is a functional block diagram showing the configuration of the decoding unit 117. The decoding unit 117 includes a decoding mode control unit 1171, a decoding completion detection unit 1172, and a picture decoding unit 1173.

The decoding control unit 1171 is a control unit 112.
The picture decoding unit 1173 is instructed to perform special reproduction or normal reproduction based on the reproduction mode instruction input from. When the decoding completion detection unit 1172 detects the picture output signal output from the picture decoding unit 1173 when outputting the reproduced I picture to the display unit 118, the decoding completion detection unit 1172 notifies the control unit 112 of the decoding completion signal.

The picture decoding unit 1173 operates in the reproduction mode instructed by the decoding control unit 1171 in the second mode.
The I picture input by the picture selection unit 114 is decoded, reproduced, and output to the display unit 118, and the picture output signal is output to the decoding completion detection unit 1172. The display unit 118 displays the video represented by the I picture after the reproduction, which is input from the decoding unit 117. <Operation> Next, details of the I-picture extraction interval adjustment process performed by the control unit 112 will be described. This adjustment process is performed when the I picture is read from the recording medium 116 and the buffer 11
This is performed in two stages during the decoding process of the I picture recorded in No. 5. Hereinafter, the I-picture extraction interval adjustment processing performed at the time of reading is referred to as “reading adjustment processing”, and the processing performed at the time of decoding processing is referred to as “decoding processing time adjustment processing”.

First, the read adjustment process will be described.
FIG. 6 is a flowchart showing a read time adjustment process performed by the control unit 112. Hereinafter, the read adjustment process will be described with reference to FIG. The control unit 112 uses the recording medium 11
When the timing to read the I picture comes from the video data stream recorded in step 6 (step S6)
01), the timer is set, and the first
The measurement of the read time (T1) until the I picture is read by the picture selection unit 113 is started (step S
602), when the notification of the read completion signal is received from the first picture selection unit 113 (step S603), the measurement is ended (step S604), and the measured read time (T1) is
Frame rate (f) selected at the start of measurement
It is determined whether or not it is longer than the maximum permissible read time (1 / f) calculated based on (step S605).

When it is long (step S605: Y), the control unit 112 refers to the frame rate list, selects the reduction processing frame rate corresponding to the selected frame rate (f), and selects the selected reduction processing frame rate. The frame rate is set to the first picture selecting unit 113 and the second picture selecting unit 1.
14 is notified (step S606), and it is determined whether the trick play processing of the video data stream is completed (step S607).

When the process is completed (step S607: Y),
When the read time adjustment process is completed and is not completed (step S607: N), a decode process time adjustment process, which will be described later, is performed (step S608). In step S605,
If not long (step S605: N), step S6
The processing of 07 is performed.

Next, the operation of the decoding process adjustment process will be described. FIG. 7 is a flowchart showing the operation of the decoding process adjustment process performed by the control unit 112. Less than,
The decoding adjustment process will be described with reference to FIG. 7. When the control unit 112 receives the notification of the storage position of the I picture in the buffer 115 from the second picture selection unit 114 when outputting the I picture selected by the second picture selection unit 114 to the decoding unit 117, The two-picture selection unit 114 determines whether or not the picture subjected to the first frame rate increase processing is in the standby state by the value of the flag (hereinafter, referred to as “standby state determination flag value”) (step S701).

In the standby state (step S701:
Y), a buffer of the head I picture holding whether or not the storage position corresponds to the storage position of the head I picture at which the first frame rate increasing process is started by the first picture selection unit 113 The determination is made by comparing with the position information (step S702). When it corresponds (step S <b> 702: Y), the set special reproduction speed and the held increase processing frame rate are notified to the second picture selection unit 114, and the standby state determination flag value is set to a value indicating a non-standby state. (For example, “0”), the time interval (T) held for the second frame rate increase processing is set in the timer (step S703), the timer is further activated, and the measurement of the set time is started. (Step S704),
It is determined whether or not a decoding completion signal is notified from the decoding unit 117 within the set time (step S705).

When there is no notification (step S705:
N), the control unit 112 refers to the frame rate list, selects the reduction processing frame rate corresponding to the frame rate selected immediately before, and sets the selected reduction processing frame rate to the first picture selection unit 113 and the second picture selection unit 113. Notify each of them to the picture selection unit 114 (step S706),
It waits for the notification of the decoding completion signal (step S70).
7) If there is a notification (step S707: Y), a new time interval (T) is calculated from the calculation formula (1) based on the selected reduction processing frame rate (step S707).
708), the calculated time interval (T) is set in the timer (step S709), and it is determined whether or not there is a selection completion notification from the second picture selection unit 114 (step S7).
10).

When the selection completion notification is given (step S7)
10: Y), the process is terminated, and if there is not any (step S71)
0: N), and returns to the read adjustment process (step S72).
2). In step S705, when the notification is given (step S705: Y), the time (T2) from the time when the timer is activated until the notification is given is calculated (step S711), and by referring to the frame list, The increase processing frame rate (f1) corresponding to the frame rate (f0) selected immediately before is selected, and based on the set special reproduction speed and the increase processing frame rate,
The time interval (T) is calculated by the above calculation formula (1) (step S712), and it is determined whether the time (T2) is shorter than the calculated time interval (T) (step S71).
3).

If it is short (step S713: Y), it is determined whether or not the frame rate (f0) selected immediately before is the maximum value at the set special reproduction speed (step S7).
14). If it is not the maximum value (step S714: N),
It is determined whether the read time (T1) measured immediately before is shorter than the calculated read time (1 / f0) based on the frame rate (f0) selected immediately before (step S7).
15).

If the frame rate is short (step S714: Y), the selected frame rate for increasing processing is notified to the first picture selecting section 113 (step S716), and the frame rate increasing processing notified by the first picture selecting section 113. The buffer position information for the first I picture at which the start is started is held (step S717), and the second frame rate is increased by the above calculation formula (1) based on the set reproduction speed and the selected increase processing frame rate. The time interval (T) used for processing is calculated, and the time interval and the selected increase processing frame rate are held (step S71).
8) The standby state determination flag value is set to a flag value (for example, "1") indicating that the standby state is set (step S71).
9), after the timer setting time has elapsed, the process of step S710 is performed.

If it is not short in step S713 (step S713: N), it is the maximum value in step S714 (step S714: Y) and if it is not short in step S715 (step S7).
15: N), after each timer setting time has elapsed (step S720: Y), the process of step S710 is performed. In step S701, when it is not in the standby state (step S701: N) and when it is not applicable in step S702 (step S702: N), the timer is started,
The set time set in the timer at that time (as an initial setting, the time calculated by the above calculation formula (1) based on the set reproduction speed and the maximum value of the frame rate for the reproduction speed in the frame list) After the interval (T) is set, measurement of the time period reset by the execution of the processing after step 703 is started (step S721), and the processing of step S705 is performed.

Next, the operation of the I picture selection process performed by the first picture selection unit 113 will be described. FIG. 8 is a flowchart showing the above operation. The above operation will be described below with reference to FIG. First picture selection unit 1
When the controller 14 receives the notification of the special reproduction speed and the frame rate from the control unit 112 (step S801), the time interval (T) is calculated based on the notified special reproduction speed and the frame rate by the calculation formula (1). Calculate (step S8
02), by referring to the position information list, the I picture selected immediately before (if there is no I picture selected immediately before, the head I picture showing the minimum number of bytes in the position information list) Is calculated by adding the STC count number corresponding to the calculated time interval (T) to the accumulated STC count number (step S803), and the calculated STC count number is smaller than the byte number indicated by the position information of the I picture selected immediately before. For each I picture having a large number of bytes, the absolute value of the difference between the STC count number of the I picture and the cumulative STC count number is calculated (step S804), and the I picture having the smallest absolute value of the difference is selected (step S804). S805), in the video data stream recorded in the recording medium 116, based on the position information of the I picture. Identifying a position of the I-picture, reads the I-picture from the video data stream, and notifies the read completion signal to the control unit 112, read out I
The picture is transferred to the buffer 115 and recorded (step S806).

Next, the operation of the I picture selection process performed by the second picture selection unit 114 will be described. FIG. 9 is a flowchart showing the above operation. The above operation will be described below with reference to FIG. Second picture selection unit 1
When the controller 14 receives the notification of the special reproduction speed and the frame rate from the control unit 112 (step S901), the buffer 1
In the video data stream of each I picture recorded in 15, each I picture to be decoded is
The time interval (T) selected based on the reproduction time added to the picture is calculated based on the special reproduction speed and the frame rate notified from the control unit 112, and the calculation formula (1) is used.
Is calculated (step S902), and for each I picture recorded in the buffer 115, the STC count number at each reproduction time indicated by the time difference from the reproduction time in the immediately preceding I picture is calculated as (Step S903), the cumulative reproduction time interval (T3) from the first I picture is calculated for each I picture by sequentially adding the detected STC count number at each reproduction time from the first. (Step S
904), the size of the calculated time interval (T) and each cumulative reproduction time interval (T3) is determined in ascending order of (T3) (step S905).

When T3 is equal to or larger than T (step S905: Y), the relevant I picture (hereinafter referred to as "I1").
"Picture". ) Cumulative playback time interval (T
3) and the time interval (T) (hereinafter referred to as "D1"), the time interval (T) and the I immediately preceding the I picture.
The size of the picture (hereinafter referred to as “I2” picture) and the difference (hereinafter referred to as “D2”) from the cumulative reproduction time interval (T3) is determined (step S906).

If D1 is larger (step S90)
6: Y), select the I1 picture (step S90)
7) The selected I1 picture is read from the buffer 115 and output to the decoding unit 117. If the selected I1 picture is not large (step S906: N), the I2 picture is selected (step S908), and the selected I2 picture is buffer 115.
And outputs to the decoding unit 117.

Further, in step S905, T3 is T
If smaller (step S905: N), the next (T
3) is calculated (step S909), and step S905
Process. Although the embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to this embodiment. <Supplement> (1) For example, PID may be added to the position information list. As a result, even in the case of a multiplexed stream, the video data can be identified, so that special reproduction can be efficiently performed even in the stream recorded while being multiplexed. (2) In addition, the frame rate adjustment processing does not increase or decrease stepwise according to the immediately preceding frame rate as in the present embodiment, but the fixed frame rate is set regardless of the immediately preceding frame rate. It may be increased or decreased. Further, when the frame rate is decreased, the frame rate is suddenly lowered to the minimum value (2 in the example of FIG. 4), and then the frame rate is gradually increased (for example, increased by 3 in the example of FIG. 4). It may be that.

[0055]

According to the present invention, a video data stream is composed of a plurality of video data having time information indicating a reproduction time, and each video data is arranged in the order of the reproduction time of the video data. A video playback device that selects video data to be played back at a specific playback time interval in the order of playback time, decodes each selected video data and plays back the video data every time the video data is selected. Measuring means for measuring the decoding processing efficiency of the video data, and decoding for measuring the reproduction time interval for selecting the video data to be reproduced from the video data stream every time the decoding processing efficiency is measured. Adjusting means for adjusting based on the value of the processing efficiency.

In the present invention, the video data stream is
Each video data is reproduced at a specific reproduction time interval from the video data stream composed of a plurality of video data having time information indicating a reproduction time, and each video data is arranged in the order of the reproduction time of the video data. A method of reproducing in a video recording / reproducing apparatus for selecting and decoding each selected video data according to the order of, and measuring the decoding processing efficiency of the selected video data every time the video data is selected. And a step of adjusting the reproduction time interval for selecting video data from the video data stream based on the measured value of the decoding processing efficiency every time the decoding processing efficiency is measured. May be

In the present invention, the video data stream is
Each video data is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged at a specific playback time interval from the video data stream in which the video data is arranged in the order of the playback time of the video data. A program used in a video recording / reproducing apparatus for selecting in accordance with the order and decoding and reproducing each selected video data, wherein the program is a decoding processing efficiency of the selected video data every time the video data is selected. And a step of adjusting the reproduction time interval for selecting video data from the video data stream based on the measured decoding efficiency every time the decoding efficiency is measured. And may be included.

In the present invention, the video data stream is
Each video data is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged at a specific playback time interval from the video data stream in which the video data is arranged in the order of the playback time of the video data. A computer-readable recording medium that records a program used in a video recording / reproducing apparatus that selects in accordance with the order, and decodes and reproduces each selected video data, wherein the program is selected every time the video data is selected. A measuring step for measuring the decoding processing efficiency of the selected video data, and the decoding processing efficiency for measuring the reproduction time interval for selecting the video data from the video data stream every time the decoding processing efficiency is measured. Adjusting step based on the value of

As a result, since the reproduction time interval of the video data from the video data stream to be specially reproduced is adjusted in association with the fluctuation of the decoding processing efficiency, the decoding processing efficiency of the video reproduction recording apparatus is improved during the special reproduction. Even if it decreases, the delay of the time required from the start to the end of the reproduction of the video data stream to be specially reproduced can be reduced by adjusting the reproduction time interval of the video data to be wide. .

Here, the measuring means measures the decoding processing efficiency by measuring the decoding processing time of the selected video data, and the adjusting means measures the measured decoding processing time immediately before. First determining means for determining whether or not it is larger than the reproduction time interval adjusted on the basis of the decoding time, and if the measured decoding process time is smaller than the reproduction time interval, the decoding process time. Is greater than the reproduction time interval and the second determination means for determining whether is smaller than the threshold value,
The reproduction time interval is lengthened to a predetermined level, and when it is smaller than a threshold value, the reproduction time interval is shortened to a predetermined level. Interval determining means for determining the reproduction time interval for selecting the video data to be reproduced, the video reproduction device, at the reproduction time interval determined by the interval determining means from the video data stream, It is possible to provide a selecting means for newly selecting video data to be reproduced from the video data stream.

As a result, when the decoding process decreases, the reproduction time interval of the video data from the video data stream to be specially reproduced is widened, the delay of the special reproduction time is reduced, and when the decoding process is restored, the reproduction of the video data is performed. Since the time interval is narrowed and a moving image with less discontinuity between images is reproduced, it is possible to realize an effective special reproduction corresponding to a change in decoding processing efficiency.

Here, when the measured decoding processing time is larger than the reproduction time interval adjusted based on the decoding processing time measured immediately before, the adjusting means is associated with the reproduction time interval. The reproduction time interval may be increased to a predetermined level, and when the reproduction time interval is smaller than the threshold value, the reproduction time interval may be decreased to a predetermined level associated with the reproduction time interval.

As a result, it becomes possible to adjust the reproduction time interval of the video data in consideration of the set level of the reproduction time interval of the immediately preceding video data. It is possible to prevent the special reproduction of a moving image that makes a person feel uncomfortable. Here, the video recording / reproducing apparatus further includes a recording medium recording the video data stream, a temporary recording medium having a recording area for temporarily recording video data selected from the video data stream, and the recording. Recording processing means for performing a recording process of selecting video data to be reproduced from the video data stream recorded on the medium, reading the selected video data from the recording medium, and recording the video data on the temporary recording medium. Recording processing efficiency measuring means for measuring the efficiency of the recording processing each time is selected, and the adjusting means is further recorded on the recording medium every time the recording processing efficiency is measured. The playback time interval for selecting video data to be played back from the video data stream is adjusted based on the measured recording processing efficiency value. It is also possible to be.

In the present invention, the video data stream is
The video data to be reproduced is composed of a plurality of video data having time information indicating the reproduction time, and each video data is arranged in the order of the reproduction time of the video data. A video reproducing apparatus for selecting and reproducing each video data selected according to the order of the reproduction time, the recording medium recording the video data stream, and the video selected from the video data stream. Video data to be reproduced is selected from a temporary recording medium having a recording area for temporarily recording data and the video data stream recorded on the recording medium, and the selected video data is read from the recording medium, and Recording processing means for performing recording processing for recording on a temporary recording medium, and efficiency of the recording processing each time video data is selected And recording performance measuring means for measuring,
Each time the recording processing efficiency is measured, the reproduction time interval for selecting the video data to be reproduced from the video data stream recorded in the recording medium is measured based on the measured recording processing efficiency value. It is also possible to provide an adjusting means for adjusting.

In the present invention, the video data stream is
Each video data is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged at a specific playback time interval from the video data stream in which the video data is arranged in the order of the playback time of the video data. A reproducing method in a video recording / reproducing apparatus comprising a recording medium recording the video data stream, which is selected in accordance with the order, decodes and reproduces each selected video data, and which is recorded on the recording medium. A recording process step of performing a recording process of selecting video data to be reproduced from the video data stream, reading the selected video data from the recording medium, and recording the video data on the temporary recording medium, and each time the video data is selected, A recording processing efficiency measuring step for measuring the efficiency of the recording processing; and the recording medium every time the recording processing efficiency is measured. From the video data stream recorded, it may include an adjustment step of adjusting, based on the value of the recording process efficiency the measured playback time interval for selecting video data to be reproduced.

In the present invention, the video data stream is
Each video data is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged at a specific playback time interval from the video data stream in which the video data is arranged in the order of the playback time of the video data. A program used in a video recording / reproducing apparatus including a recording medium that selects in accordance with the order, decodes and reproduces each selected video data, and records the video data stream,
A recording process in which the program performs a recording process of selecting video data to be reproduced from the video data stream recorded in the recording medium, reading the selected video data from the recording medium, and recording the video data in the temporary recording medium. Step, a recording processing efficiency measuring step for measuring the efficiency of the recording processing each time video data is selected, and the video data stream recorded on the recording medium every time the recording processing efficiency is measured. It is also possible to include an adjusting step of adjusting the reproduction time interval for selecting video data to be reproduced based on the measured recording processing efficiency value.

In the present invention, the video data stream is
Each video data is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged at a specific playback time interval from the video data stream in which the video data is arranged in the order of the playback time of the video data. A computer-readable recording medium in which a program used in a video recording / reproducing apparatus, which is selected in accordance with the order, decodes and reproduces each selected video data, and which records the video data stream, is recorded. The program performs a recording process of sequentially selecting video data to be reproduced from the video data stream recorded on the recording medium, reading the selected video data from the recording medium, and recording the video data on the temporary recording medium. Processing steps,
A recording processing efficiency measuring step for measuring the efficiency of the recording processing each time video data is selected, and a reproduction from the video data stream recorded on the recording medium every time the recording processing efficiency is measured. It is also possible to include an adjusting step of adjusting the reproduction time interval for selecting the video data to be reproduced based on the measured value of the recording processing efficiency.

As a result, the reproduction time interval of the video data from the video data stream to be specially reproduced is adjusted in association with the fluctuation of the recording processing capacity, so that the recording processing capacity of the video reproduction recording apparatus is improved during the special reproduction. Even if it decreases, the delay of the time required from the start to the end of the reproduction of the video data stream to be specially reproduced can be reduced by adjusting the reproduction time interval of the video data to be wide. .

[Brief description of drawings]

FIG. 1 is a video recording / reproducing apparatus 1 according to an embodiment of the present invention.
It is a functional block diagram showing a configuration of 00.

FIG. 2 is a conceptual diagram showing a correspondence relationship between a configuration of a position information list recorded on a recording medium 116 and a video data stream.

FIG. 3 shows a specific example of the contents of a position information list.

FIG. 4 shows a specific example of a frame rate list.

5 is a functional block diagram showing a configuration of a decoding unit 117. FIG.

FIG. 6 is a flowchart showing a read adjustment process performed by the control unit 112.

FIG. 7 is a flowchart showing the operation of a decoding process adjustment process performed by the control unit 112.

FIG. 8 is a flowchart showing an operation of I-picture selection processing performed by the first picture selection unit 113.

9 is a flowchart showing an operation of I-picture selection processing performed by the second picture selection unit 114. FIG.

FIG. 10 shows an example of a screen display during special reproduction.

FIG. 11 shows an example of a video data stream reproduced in normal reproduction and special reproduction (fast forward).

FIG. 12 shows a flowchart of a trick play process performed by the video recording / playback apparatus.

[Explanation of symbols]

100 video recording / playback device 110 Operation part 111 tuner section 112 control unit 113 first picture selection unit 114 second picture selection unit 115 buffer 116 recording medium 117 Decoding section 118 display 1171 Decode mode control unit 1172 Decoding completion detection unit 1173 Picture decoding unit

Claims (11)

[Claims] 1. A video data stream is composed of a plurality of video data having time information indicating a playback time, and each video data is to be played back from the video data stream in which the video data is arranged in the order of the playback time of the video data. A video playback device that selects video data at a specific playback time interval in the order of playback times, decodes and plays each selected video data, and selects the video data each time the video data is selected. Measuring means for measuring the decoding processing efficiency of the decoding processing efficiency of the decoding processing efficiency for selecting the video data to be reproduced from the video data stream every time the decoding processing efficiency is measured. An image reproducing apparatus comprising: an adjusting unit that adjusts based on a value. 2. The measuring means measures the decoding processing efficiency by measuring the decoding processing time of the selected video data, and the adjusting means measures the decoding processing time measured immediately before. First determining means for determining whether or not the reproduction processing time interval adjusted based on the decoding processing time is larger than the reproduction processing time interval; and if the measured decoding processing time is smaller than the reproduction processing time interval, the decoding processing time Second determination means for determining whether or not the reproduction time interval is smaller than a threshold, and if the reproduction time interval is larger than the reproduction time interval, the reproduction time interval is lengthened to a predetermined level. The playback time for selecting the video data to be newly played back so that the playback time interval is maintained when the level is shortened to An interval determining unit that determines an interval, and the video reproducing device generates video data to be newly reproduced from the video data stream at the reproduction time interval determined by the interval determining unit from the video data stream. The video reproducing apparatus according to claim 1, further comprising selection means for selecting. 3. The adjusting means is associated with the reproduction time interval when the measured decoding process time is larger than the reproduction time interval adjusted based on the decoding process time measured immediately before. 3. The video recording / reproducing apparatus according to claim 2, wherein the reproduction time interval is lengthened to a predetermined level, and when the reproduction time interval is smaller than a threshold value, the reproduction time interval is shortened to a predetermined level associated with the reproduction time interval. 4. The video recording / reproducing apparatus further includes a recording medium recording the video data stream, and a temporary recording medium having a recording area for temporarily recording video data selected from the video data stream. Recording processing means for selecting video data to be reproduced from the video data stream recorded in the recording medium, reading the selected video data from the recording medium, and performing recording processing for recording the video data in the temporary recording medium, Recording processing efficiency measuring means for measuring the efficiency of the recording processing each time video data is selected, and the adjusting means further records in the recording medium every time the recording processing efficiency is measured. The reproduction time interval for selecting the video data to be reproduced from the video data stream is based on the measured recording processing efficiency value. Video recording and reproducing apparatus according to any one of claims 1 to 3, characterized in that adjusting are. 5. A video data stream is composed of a plurality of video data having time information indicating a reproduction time, and each video data is reproduced from the video data stream arranged in the order of the reproduction time of the video data. A video reproducing apparatus for selecting video data to be reproduced at a specific reproduction time interval in the order of reproduction times, decoding and reproducing each selected video data, and a recording medium recording the video data stream. The video data to be reproduced is selected and selected from a temporary recording medium having a recording area for temporarily recording the video data selected from the video data stream and the video data stream recorded on the recording medium. Recording processing means for performing recording processing for reading the video data from the recording medium and recording the video data in the temporary recording medium; Recording processing efficiency measuring means for measuring the efficiency of the recording processing each time the data is selected, and for reproducing the video data stream recorded on the recording medium each time the recording processing efficiency is measured. A video recording / reproducing apparatus comprising: an adjusting unit for adjusting the reproduction time interval for selecting the video data to be reproduced based on the measured value of the recording processing efficiency. 6. A video data stream is composed of a plurality of video data having time information indicating a reproduction time, and each video data is reproduced in a specific manner from the video data stream arranged in the order of the reproduction time of the video data. A reproducing method in a video recording / reproducing apparatus for selecting each video data at time intervals according to the order of the reproduction time, and decoding and reproducing each selected video data, which is selected every time the video data is selected. A measuring step of measuring the decoding processing efficiency of the video data, and each time the decoding processing efficiency is measured, the reproduction time interval for selecting the video data from the video data stream is set to a value of the measured decoding processing efficiency. And a step of adjusting based on the adjustment method. 7. A video data stream is composed of a plurality of video data having time information indicating a playback time, and each video data is arranged in the order of the playback time of the video data. A program used in a video recording / reproducing apparatus for selecting each video data in order of reproduction time at an interval, and decoding and reproducing each selected video data, wherein the program is set every time the video data is selected. A measuring step of measuring the decoding processing efficiency of the selected video data, and a decoding processing of measuring the reproduction time interval for selecting the video data from the video data stream every time the decoding processing efficiency is measured. An adjusting step of adjusting based on a value of efficiency, the program. 8. A video data stream is composed of a plurality of video data having time information indicating a reproduction time, and each video data is arranged in the order of the reproduction time of the video data. A computer-readable recording medium that records a program used in a video recording / reproducing device that selects each video data at intervals according to a reproduction time order, and decodes and reproduces each selected video data, wherein the program is A measurement step of measuring the decoding processing efficiency of the selected video data each time the video data is selected; and a measuring step for selecting the video data from the video data stream each time the decoding processing efficiency is measured. Adjusting the playback time interval based on the measured decoding efficiency value. And a computer-readable recording medium. 9. A video data stream is composed of a plurality of video data having time information indicating a reproduction time, and each video data has a specific reproduction time from the video data stream arranged in the order of the reproduction time of the video data. A reproducing method in a video recording / reproducing apparatus including a recording medium which selects each video data according to an order of reproduction time at an interval, decodes and reproduces each selected video data, and records the video data stream. A recording processing step of performing a recording process of selecting video data to be reproduced from the video data stream recorded on the recording medium, reading the selected video data from the recording medium, and recording the video data on the temporary recording medium. A recording processing efficiency measuring step for measuring the efficiency of the recording processing each time video data is selected; Each time the processing efficiency is measured, the reproduction time interval for selecting the video data to be reproduced from the video data stream recorded on the recording medium is adjusted based on the measured recording processing efficiency value. And a reproducing step for adjusting the reproduction speed. 10. A video data stream is composed of a plurality of video data having time information indicating a reproduction time,
From the video data stream in which each video data is arranged in the order of the reproduction time of the video data, at a specific reproduction time interval, each video data is selected according to the order of the reproduction time, and each selected video data is decoded and reproduced. A program used in a video recording / reproducing apparatus having a recording medium recording the video data stream, the program selecting video data to be reproduced from the video data stream recorded in the recording medium. Then, a recording process step of performing a recording process of reading the selected video data from the recording medium and recording the video data on the temporary recording medium, and a recording process efficiency measurement for measuring the efficiency of the recording process every time the video data is selected. And the video data stream recorded on the recording medium each time the recording processing efficiency is measured. Program, characterized in that it comprises an adjustment step of adjusting, based on the value of the recording process efficiency is measured reproduction time interval for selecting video data to be reproduced from the beam. 11. A video data stream is composed of a plurality of video data having time information indicating a reproduction time,
From the video data stream in which each video data is arranged in the order of the reproduction time of the video data, at a specific reproduction time interval, each video data is selected according to the order of the reproduction time, and each selected video data is decoded and reproduced. A computer-readable recording medium recording a program used in a video recording / reproducing apparatus having a recording medium recording the video data stream, wherein the program is recorded from the video data stream recorded in the recording medium. Sequentially selecting video data to be reproduced, reading the selected video data from the recording medium,
A recording processing step of performing a recording processing of recording on the temporary recording medium, a recording processing efficiency measuring step of measuring efficiency of the recording processing every time video data is selected, and a recording processing efficiency of measuring the recording processing efficiency every time. Adjusting the reproduction time interval for selecting the video data to be reproduced from the video data stream recorded on the recording medium based on the measured value of the recording processing efficiency. Characteristic computer-readable recording medium.