TWI688268B - Multimedia file management method, terminal device, server device and file management system - Google Patents

Abstract

A multimedia file management method for a terminal device is provided according to an embodiment of the invention, which includes: receiving a multimedia file; estimating decoding time information of the multimedia file according to a file format of the multimedia file; re-encoding the multimedia file according to the decoding time information and frame refresh time information of the multimedia file; and playing the re-encoded multimedia file. Therefore, a multimedia playing quality of the terminal device can be improved.

Description

Multimedia file management method, terminal device, server device and file management system

The invention relates to a file management mechanism, and in particular to a multimedia file management method, terminal device, server device and file management system.

With the popularization of cloud technology and Internet of Things technology, multimedia files such as videos played by terminal devices such as electronic digital signage can be uniformly pushed by the video server in the background. However, terminal devices installed at different locations and/or at different time points may have different device specifications. Therefore, how to improve the playback performance of terminal devices with different software/hardware specifications for multimedia files from a video server is one of the topics that those skilled in the art are devoted to research.

The invention provides a multimedia file management method, terminal device, server device and file management system, which can dynamically adjust the file format and/or resolution of the multimedia file to be played by the terminal device, so as to improve the multimedia playback quality of the terminal device.

An embodiment of the present invention provides a multimedia file management method for a terminal device. The multimedia file management method includes: receiving a multimedia file; evaluating the decoding time information of the multimedia file according to the file format of the multimedia file; The decoding time information and the screen refresh time information of the multimedia file re-encode the multimedia file; and play the re-encoded multimedia file.

Another embodiment of the present invention provides a terminal device, which includes a connection interface, a storage circuit, a display, and a processor. The processor is coupled to the connection interface, the storage circuit and the display. The processor is used for evaluating the decoding time information of the multimedia file according to the file format of the multimedia file. The processor is further used to re-encode the multimedia file according to the decoding time information and the frame refresh time information of the multimedia file. In addition, the processor is further used to play the re-encoded multimedia file via the display.

Another embodiment of the present invention provides a servo device, which includes a connection interface, a storage circuit, and a processor. The storage circuit is used to store multimedia files. The processor is coupled to the connection interface and the storage circuit. The processor is used for evaluating the decoding time information of the multimedia file by the terminal device according to the device information of the terminal device and the file format of the multimedia file. The processor is further used to re-encode the multimedia file according to the decoding time information and the frame refresh time information of the multimedia file. In addition, the processor is further used to transmit the re-encoded multimedia file to the terminal device via the connection interface.

Another embodiment of the present invention provides a file management system, which includes at least one terminal device and a server device. The server device is used to store multimedia files. The server device is further used for evaluating the decoding time information of the multimedia file by the first terminal device according to the file format of the multimedia file and the device information of the first terminal device in the at least one terminal device. The servo device is further used to re-encode the multimedia file according to the decoding time information and the frame refresh time information of the multimedia file. The servo device is further used to send the re-encoded multimedia file to the first terminal device. In addition, the first terminal device is used to play the re-encoded multimedia file.

Based on the above, the present invention proposes to evaluate the decoding time information of the multimedia file by the terminal device according to the file format of the multimedia file, and re-encode the multimedia file according to the obtained decoding time information and the screen refresh time information of the multimedia file. In this way, the terminal device can play the re-encoded multimedia file more smoothly, reducing the problem that the multimedia playback quality of a specific terminal device is degraded due to the inconsistent software/hardware specifications of the terminal device.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

FIG. 1 is a schematic diagram of a file management system according to an embodiment of the invention. Referring to FIG. 1, the file management system 10 includes a servo device 11 and terminal devices 12(1)~12(n). The number of n can be any positive integer. In addition, the number of servo devices 11 may also be one or more, which is not limited by the present invention.

The servo device 11 and the terminal devices 12(1)~12(n) can be various electronic devices with data transmission, data storage and data processing functions, for example, desktop computers, industrial computers, notebook computers, smart Mobile phones or tablets. In addition, the terminal devices 12(1)~12(n) may further have a multimedia file playing function. In an embodiment, at least one of the terminal devices 12(1) to 12(n) may also be an electronic signage, a display, or an information service station (kiosk) device.

The servo device 11 can communicate with the terminal devices 12(1)~12(n) via the network 13. In an embodiment, the network 13 generally refers to any type of wired connection line, such as Ethernet or the like. In an embodiment, the network 13 generally refers to any type of wireless network, for example, a Long Term Evolution (LTE) network or a Wifi network. The invention does not limit the type of network 13.

The servo device 11 can be regarded as a main control device, a management device or a multimedia data center of the terminal devices 12(1) to 12(n). For example, the server 11 may store one or more multimedia files. A multimedia file can be an image file, an audio file, or a composite audio-visual file. The server device 11 can uniformly provide the same multimedia file to the terminal devices 12(1)~12(n) for playback, or provide specific multimedia files to the terminal devices 12(1)~12(n) for playback, respectively.

It should be noted that if one of the terminal devices 12(1) to 12(n) has poor playback capability (eg, decoding capability) for a specific type of multimedia file, the terminal device plays the Multimedia files may cause delays in images and/or sounds during the playback of multimedia files, thereby affecting viewer experience. Therefore, in an embodiment, the terminal devices 12(1)~12(n) can dynamically analyze the file format and/or image resolution of the multimedia file from the server device 11 according to their own software/hardware performance Factors that may cause video and/or audio delays are appropriately adjusted (eg, re-encoding multimedia files), and attempts to improve the playback quality (eg, playback smoothness) of subsequent playback of the multimedia file. Alternatively, in an embodiment, the server device 11 may also dynamically adjust the file format and/or resolution of the multimedia file to be provided to the terminal device according to the software/hardware performance of the specific terminal device to improve the terminal The playback quality of the device when playing this multimedia file.

2 is a schematic diagram of a terminal device according to an embodiment of the invention. The basic circuit composition of the terminal device 12(1) will be described below as an example, and the basic circuit composition of the terminal device 12(1) may be the same or similar to the basic circuit composition of the servo device 11 and/or any other terminal device.

1 and 2, the terminal device 12 (1) includes a connection interface 21, a storage circuit 22, a display 23 and a processor 24. The connection interface 21 may include wired and/or wireless connection interface circuits. The connection interface 21 can connect the terminal device 12(1) to the network 13 and communicate with the server device 11 (and/or other terminal devices 12(2)~12(n)) via the network 13. For example, the connection interface 21 may include a network interface card (NIC) and/or a wireless network interface card.

The storage circuit 22 may include a volatile storage medium and a non-volatile storage medium. For example, the volatile storage medium may be random access memory (RAM), and the non-volatile storage medium may be read only memory (ROM), solid state drive (SSD), or conventional hard drive (HDD). The display 23 is used to display images. For example, the display 23 may be a liquid crystal display (Liquid Crystal Display, LCD), a light-emitting diode display (Light-Emitting Diode (LED) Display), an organic electroluminescence display (Organic Light Emitting Display, OLED), an electrophoretic display ( Electro-Phoretic Display (EPD) or other types of displays.

The processor 24 is coupled to the connection interface 21, the storage circuit 22 and the display 23 and is used to control the connection interface 21, the storage circuit 22 and the display 23. In an embodiment, the processor 24 may also be responsible for the overall operation of the terminal device 12(1). For example, the processor 24 may be a central processing unit (Central Processing Unit, CPU), or other programmable general-purpose or special-purpose microprocessors, digital signal processors (DSPs), and programmable Controllers, application specific integrated circuits (ASICs), programmable logic devices (Programmable Logic Devices, PLD) or other similar devices or combinations of these devices. In addition, the terminal device 12(1) may also include other types of input/output (I/O) interfaces and power supply circuits, etc., which is not limited by the present invention.

3 is a flowchart of a multimedia file management method according to an embodiment of the invention. The multimedia file management method according to an embodiment of the present invention will be described below using the file management system 10 of FIG. 1 and the terminal device 12(1) of FIG. 2 in conjunction with the flowchart of FIG. 3.

1 to 3, in step S301, the terminal device 12(1) receives a multimedia file (hereinafter also referred to as a first multimedia file). For example, the processor 24 of the terminal device 12(1) may receive the first multimedia file from the network 13 via the connection interface 21 and store the received first multimedia file in the storage circuit 22. In addition, the first multimedia file may be provided by the server device 11 or any one of the terminal devices 12(2) to 12(n).

After receiving the first multimedia file, in step S302, the terminal device 12(1) evaluates the decoding time information ds of the first multimedia file according to the file format of the first multimedia file. In an embodiment, the processor 24 of the terminal device 12(1) may pre-calculate the preset decoding time information used by the terminal device 12(1) to decode an image frame in the multimedia file for multiple preset file formats, And record the calculated preset decoding time information in a table. This table can be stored in the storage circuit 22.

As an example in Table 1 below, the processor 24 can perform decoding tests on multimedia files with three preset file formats of H.264, MPEG and VP8 and record the (average) decoding time ds1~ds3 of an image frame. Table 1

For example, the decoding time ds1 recorded in Table 1 may be the (average) decoding time for the processor 24 to decode an image frame of a multimedia file with the H.264 file format; the decoding time ds2 recorded in Table 1 may be The processor 24 decodes the (average) decoding time for an image frame of a multimedia file with an MPEG file format; and the decoding time ds3 recorded in Table 1 can be used by the processor 24 for a multimedia file with a VP8 file format The (average) decoding time for decoding an image frame. In another embodiment, Table 1 may record the preset decoding time information corresponding to all (or at least part of) the file formats supported by the processor 24 for playback, which will not be repeated here.

In step S302, the processor 24 may read one of the recorded preset decoding time information ds1~ds3 from Table 1 as the decoding time of the first multimedia file according to the file format of the first multimedia file Information ds. For example, assuming that the file format of the first multimedia file is H.264, the processor 24 may use the information ds1 recorded in Table 1 as the decoding time information ds of the first multimedia file.

In step S303, the terminal device 12(1) re-encodes the first multimedia file according to the decoding time information ds of the first multimedia file and the frame refresh time information F_refresh of the first multimedia file. For example, the frame refresh time information F_refresh of the first multimedia file can be the reciprocal of the frame rate (frame per second, FPS) (also known as frame rate) F of the first multimedia file (that is, F_refresh=1/F ).

For example, in step S303, the processor 24 of the terminal device 12(1) may determine whether the decoding time information ds of the first multimedia file is less than the frame refresh time information F_refresh of the first multimedia file. If the decoding time information ds is not less than the screen refresh time information F_refresh (that is, ds is greater than or equal to F_refresh), it means that the terminal device 12(1) directly playing the first multimedia file with the original file format may cause image and/or audio delay . Therefore, if the decoding time information ds is not less than the frame refresh time information F_refresh, the processor 24 may perform a file format conversion operation on the first multimedia file to re-encode the first multimedia file.

In the file format conversion operation, the file format of the first multimedia file is converted from the original file format (also known as the first file format) to a new file format (also known as the second file format), and the One file format is different from the second file format. For example, the processor 24 can re-select a file format corresponding to the smallest (or less than the current decoding time ds) decoding time from the above table 1 as the new file format of the first multimedia file (ie, the second file format) . For example, assuming that the original file format of the first multimedia file (that is, the first file format) is H.264 and ds3<ds2<ds1, the processor 24 may select the file format VP8 corresponding to the decoding time ds3 as the second file Format and re-encode the first multimedia file according to the file format VP8. On the contrary, if the decoding time information ds is less than the screen refresh time information F_refresh, the processor 24 may not perform the file format conversion operation.

In step S304, the terminal device 12(1) plays the re-encoded first multimedia file. For example, assuming that the file format of the first multimedia file is converted to a new file format (ie, the second file format) in step S303, the processor 24 subsequently plays the first multimedia file with the second file format via the display 23 Body files can be relatively smooth.

4 is a flowchart of a multimedia file management method according to another embodiment of the invention. The multimedia file management method according to another embodiment of the present invention will be described below using the file management system 10 of FIG. 1 and the terminal device 12(1) of FIG. 2 in conjunction with the flowchart of FIG. 4. It should be noted that steps S401, S402, and S405 in FIG. 4 are respectively the same or similar to steps S301, S302, and S304 in FIG. 3, so details are not described here.

In step S403, the terminal device 12(1) evaluates the frame rendering time information rs of the first multimedia file according to the resolution information P of the first multimedia file. Wherein, the resolution information P of the first multimedia file reflects the image resolution of the first multimedia file (for example, expressed by the number of pixels), and the frame rendering time information rs of the first multimedia file It is the time required to draw one (or one) image frame in the first multimedia file. If the image resolution (the larger the value of P) of the first multimedia file is higher, the time required to draw one (or once) image frame is often more. Conversely, if the image resolution of the first multimedia file is low (the value of P is small), the time required to draw one (or once) image frame is often less. From another perspective, it can be considered that the resolution information P of the first multimedia file is positively related to the frame rendering time information rs of the first multimedia file. The processor 24 of the terminal device 12(1) may bring the resolution information P of the first multimedia file into a specific algorithm or look-up table to obtain the screen rendering time information rs of the first multimedia file.

In step S404, the terminal device 12(1) restarts according to the decoding time information ds of the first multimedia file, the frame drawing time information rs of the first multimedia file, and the screen refresh time information F_refresh of the first multimedia file Encode the first multimedia file. For example, in step S404, the processor 24 of the terminal device 12(1) may perform the operation of step S303 of FIG.

In addition, in step S404, the processor 24 may further determine whether the sum of the decoding time information ds of the first multimedia file and the frame drawing time information rs of the first multimedia file is less than the screen refresh of the first multimedia file Time information F_refresh. If the sum of the decoding time information ds of the first multimedia file and the frame drawing time information rs of the first multimedia file is not less than the frame refresh time information F_refresh of the first multimedia file (that is, ds+rs is greater than or equal to F_refresh ), indicating that the terminal device 12(1) directly playing the first multimedia file with the original image resolution may cause the image and/or sound to be delayed. Therefore, the processor 24 can perform a resolution adjustment operation on the first multimedia file to re-encode the first multimedia file.

In the resolution adjustment operation, the processor 24 adjusts the resolution of the first multimedia file from the original resolution (also referred to as the first resolution) to a new resolution (also referred to as the second resolution), And the first resolution is different from the second resolution. For example, the second resolution may be less than the first resolution.

In one embodiment, the processor 24 only needs to lower the resolution of the first multimedia file. In an embodiment, the processor 24 may further calculate the resolution adjustment parameter F_scale of the first multimedia file according to the following equation (1):

…(1)

…(1)

Assuming that the original resolution information of the first multimedia file is expressed as the original resolution information in the width direction (W1) multiplied by the resolution information in the height direction (H1), the processor 24 can The new resolution information in the width direction is set to (W1xF_scale) and the new resolution information in the height direction of the first multimedia file is set to (H1xF_scale), thereby reducing the resolution of the first multimedia file. In this way, the first multimedia file with the second resolution can be played more smoothly later. Conversely, if the sum of the decoding time information ds of the first multimedia file and the screen rendering time information rs of the first multimedia file is less than the screen refresh time information F_refresh of the first multimedia file (that is, ds+rs is less than F_refresh) , The processor 24 may not perform the resolution adjustment operation.

In summary, in the foregoing embodiment, the processor 24 of the terminal device 12(1) can dynamically decide whether to re-encode the first multimedia file. In particular, in an embodiment that decides to re-encode the first multimedia file, the processor 24 may dynamically decide to only perform the file format conversion operation, only the resolution adjustment operation, or the file format conversion operation and the resolution adjustment operation All need to be executed. In addition, in an embodiment where both the file format conversion operation and the resolution adjustment operation need to be performed, the file format conversion operation and the resolution adjustment operation may be performed simultaneously or sequentially, and the present invention is not limited.

It should be noted that although the foregoing embodiments take the operation of the terminal device 12(1) as an example, the operation flow of FIG. 3 and/or FIG. 4 can actually be applied to the remaining terminal devices 12(2) in FIG. )~12(n). For example, according to the respective software/hardware specifications of the terminal devices 12(1)~12(n), corresponding to the same first multimedia file (for example, from the server device 11), the terminal devices 12(1)~12( n) The re-encoded first multimedia file may have different file formats and/or resolutions. In addition, more types of file adjustment mechanisms can also be used in the operation of re-encoding the first multimedia file. The present invention is not limited to adjusting the file format and resolution of the first multimedia file, as long as the terminal can be improved The playback quality (such as playback smoothness) of the first multimedia file by the device may be sufficient.

In an embodiment, the operation of re-encoding the multimedia file may also be performed in the server 11. By this, even if the terminal devices 12(1)~12(n) do not execute the operation flow as shown in FIG. 3 or FIG. 4, the servo device 11 can also obtain the device information according to the respective device information of the terminal devices 12(1)~12(n). Re-encode the multimedia files to be provided to the terminal devices 12(1)~12(n) to improve the playback quality (such as smoothness) of the multimedia files played by the terminal devices 12(1)~12(n).

For example, assume that Table 2 below is stored in the storage circuit of the servo device 11, and Table 2 describes the preset decoding time information of the terminal devices 12(1) to 12(3) for multiple preset file formats, respectively. In other words, the following Table 2 describes the device information of the terminal devices 12(1) to 12(3). Table 2

In Table 2, the decoding times ds1, ds4, and ds7 are the (average) decoding times for the terminal devices 12(1) to 12(3) to decode one image frame of the multimedia file with the H.264 file format, respectively; The decoding times ds2, ds5 and ds8 are the (average) decoding times for the terminal devices 12(1) to 12(3) to decode an image frame of a multimedia file with the MPEG file format; and the decoding times ds3, ds6 and ds8 is the (average) decoding time for the terminal devices 12(1)~12(3) to decode one video frame of the multimedia file with the VP8 file format, respectively.

In an embodiment, the decoding times ds1 to ds3 in Table 2 may be obtained by the terminal device 12(1) decoding tests on multimedia files with three preset file formats of H.264, MPEG, and VP8. The decoding time ds4~ds6 can be obtained by the terminal device 12(2) decoding the multimedia files with three preset file formats of H.264, MPEG and VP8 respectively. The decoding time ds7~ds9 can be obtained by the terminal device 12(3) decoding the multimedia files with three preset file formats of H.264, MPEG and VP8 respectively. Or, in an embodiment, the decoding times ds1~ds3, ds4~ds6, and ds7~ds9 in Table 2 may be determined by the processor of the servo device 11 according to the specifications of the terminal devices 12(1)~12(3) (For example, software/hardware specifications) obtained by analog decoding test.

In an embodiment, before transmitting a specific multimedia file (eg, the first multimedia file) to the terminal devices 12(1)~12(3), the processor of the server device 11 is based on the terminal device 12(1) The device information of ~12(3) and the file format of the first multimedia file are evaluated by the terminal devices 12(1)~12(3) for decoding time information of the first multimedia file, respectively. For example, assuming that the original file format of the first multimedia file is H.264, then through the lookup table 2, the processor of the server device 11 can obtain the terminal devices 12(1)~12(3) for the first multimedia file, respectively. The decoding time information of the file is ds1, ds4 and ds7.

After obtaining the decoding time information ds1 of the first multimedia file by the terminal device 12(1), the processor of the server device 11 can determine whether it is necessary according to the decoding time information ds1 and the screen refresh time information F_refresh of the first multimedia file Re-encode the first multimedia file to be transmitted to the terminal device 12(1). After obtaining the decoding time information ds4 of the first multimedia file by the terminal device 12 (2), the processor of the server device 11 can determine whether it is necessary according to the decoding time information ds4 and the screen refresh time information F_refresh of the first multimedia file Re-encode the first multimedia file to be transmitted to the terminal device 12(2). After obtaining the decoding time information ds7 of the first multimedia file by the terminal device 12 (3), the processor of the server device 11 can determine whether it is necessary according to the decoding time information ds7 and the screen refresh time information F_refresh of the first multimedia file Re-encode the first multimedia file to be transmitted to the terminal device 12(3). Here, it is determined whether the operation of re-encoding the first multimedia file and the operation of re-encoding the first multimedia file are required according to the decoding time information and the screen refresh time information of the first multimedia file (for example, performing a file format conversion operation ) Operation details can refer to step S303 in FIG. 3, which will not be repeated here.

In one embodiment, the processor of the servo device 11 may further evaluate the frame rendering time information rs of the first multimedia file according to the resolution information P of the first multimedia file. According to the decoding time information ds1, the screen rendering time information rs of the first multimedia file and the screen refresh time information F_refresh of the first multimedia file, the processor of the server 11 can determine whether re-encoding is required to be transmitted to the terminal device 12 (1) The first multimedia file. Based on the decoding time information ds4, the first multimedia file's screen rendering time information rs, and the first multimedia file's screen refresh time information F_refresh, the processor of the server 11 can determine whether re-encoding is required to be transmitted to the terminal device 12 (2) The first multimedia file. Based on the decoding time information ds7, the first multimedia file's screen rendering time information rs, and the first multimedia file's screen refresh time information F_refresh, the processor of the server 11 can determine whether re-encoding is required to be transmitted to the terminal device 12 (3) The first multimedia file. Here, the operation of assessing the frame drawing time information of the first multimedia file, determining whether the operation of re-encoding the first multimedia file and the operation of re-encoding the first multimedia file (for example, performing a resolution adjustment operation) For details of the operation, please refer to step S404 in FIG. 4, which will not be repeated here.

After re-encoding the first multimedia file to be transmitted to at least one of the terminal devices 12(1) to 12(3), the connection interface of the server device 11 can be transferred via the network 13 (recoded or not The re-encoded) first multimedia files are sent to the terminal devices 12(1)~12(3) respectively for storage and playback. For example, suppose that the first multimedia file to be transmitted to the terminal devices 12(1) and 12(2) is re-encoded in the server device 11 and the first multimedia file to be transmitted to the terminal device 12(3) If it is not re-encoded in the servo device 11, the first multimedia files received and played by the terminal devices 12(1) and 12(2) may have new file formats and/or new resolutions, respectively, and The first multimedia file received and played by the terminal device 12(3) has the original file format and the original resolution. In this way, even if the software/hardware performance of the terminal devices 12(1) and 12(2) is poor, the terminal devices 12(1) to 12(3) can smoothly play the first multimedia file with the same content.

In summary, the present invention proposes to evaluate the decoding time information of the multimedia file by the terminal device according to the file format of the multimedia file, and re-encode the multimedia file according to the obtained decoding time information and the screen refresh time information of the multimedia file . In this way, the terminal device can play the re-encoded multimedia file more smoothly, reducing the problem that the multimedia playback quality of a specific terminal device is degraded due to the inconsistent software/hardware specifications of the terminal device.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

10: File management system 11: Servo device 12(1)~12(n): Terminal device 13: Network 21: Connection interface 22: Storage circuit 23: Display 24: Processor S301~S304, S401~S405: Steps

FIG. 1 is a schematic diagram of a file management system according to an embodiment of the invention. 2 is a schematic diagram of a terminal device according to an embodiment of the invention. 3 is a flowchart of a multimedia file management method according to an embodiment of the invention. 4 is a flowchart of a multimedia file management method according to another embodiment of the invention.

S301~S304: Steps

Claims (13)

A multimedia file management method is used for a terminal device. The multimedia file management method includes: calculating, for a plurality of preset file formats, a preset decoding time information used by the terminal device to decode an image frame; and calculating the calculated The default decoding time information is recorded in a table; receiving a multimedia file; reading one of the recorded default decoding time information from the table according to the file format of the multimedia file as the decoding time information of the multimedia file Re-encoding the multimedia file according to the decoding time information and the picture refresh time information of the multimedia file; and playing the re-encoded multimedia file. The multimedia file management method as described in item 1 of the patent scope, wherein the step of re-encoding the multimedia file based on the decoding time information and the screen refresh time information of the multimedia file includes: evaluating based on a resolution information of the multimedia file A picture drawing time information of the multimedia file; and re-encoding the multimedia file according to the decoding time information, the picture refresh time information and the picture drawing time information. The multimedia file management method as described in item 1 of the patent application scope, wherein the step of re-encoding the multimedia file includes performing at least one of a file format conversion operation and a resolution adjustment operation, The file format conversion operation includes converting the file format of the multimedia file from a first file format to a second file format, wherein the first file format is different from the second file format, and the resolution adjustment operation includes Adjusting a resolution of the multimedia file from a first resolution to a second resolution, where the first resolution is different from the second resolution. The multimedia file management method as described in item 3 of the patent application scope, wherein the file format conversion operation is performed after determining that the decoding time information is not less than the screen refresh time information, wherein the resolution adjustment operation is determining the decoding time The sum of the information and the drawing time information of the multimedia file is not less than the refresh time information of the screen. A terminal device includes: a connection interface for receiving a multimedia file; a storage circuit for storing the multimedia file; a display; and a processor coupled to the connection interface, the storage circuit and the display, wherein The processor is used to calculate the preset decoding time information used by the terminal device to decode an image frame for multiple preset file formats, and the processor is further used to record the calculated preset decoding time information in A table and store the table in the storage circuit, wherein the processor is further used to retrieve the table according to the file format of the multimedia file Read one of the preset decoding time information recorded as the decoding time information of the multimedia file, wherein the processor is further used for re-encoding the decoding time information and a frame refresh time information of the multimedia file Multimedia files, wherein the processor is further used to play the re-encoded multimedia files via the display. The terminal device as described in item 5 of the patent application scope, wherein the processor re-encodes the multimedia file according to the decoding time information and the screen refresh time information of the multimedia file includes: according to a resolution information of the multimedia file Evaluate a picture drawing time information of the multimedia file; and re-encode the multimedia file according to the decoding time information, the picture refresh time information and the picture drawing time information. The terminal device according to item 5 of the patent application scope, wherein the operation of re-encoding the multimedia file includes performing at least one of a file format conversion operation and a resolution adjustment operation, wherein the file format conversion operation includes the multimedia The file format of the file is converted from a first file format to a second file format, wherein the first file format is different from the second file format, and the resolution adjustment operation includes a resolution of the multimedia file from a The first resolution is adjusted to a second resolution, wherein the first resolution is different from the second resolution. The terminal device as described in item 7 of the patent application scope, wherein the file format conversion operation is performed after the processor determines that the decoding time information is not less than the screen refresh time information, wherein the resolution adjustment operation is performed on the processor It is executed after determining that the sum of the decoding time information and the picture drawing time information of the multimedia file is not less than the picture refresh time information. A servo device includes: a connection interface; a storage circuit for storing a multimedia file; and a processor coupled to the connection interface and the storage circuit, wherein the processor is used to obtain the terminal device for multiple The default file format is used to decode a preset decoding time information of an image frame, wherein the processor is further used to store the preset decoding time information in the storage circuit, and the processor is further used to according to the multimedia The file format of the file reads one of the preset decoding time information recorded from the storage circuit as the decoding time information of the multimedia file, wherein the processor is further used to determine the decoding time information and the multimedia file A picture refresh time information re-encodes the multimedia file, wherein the processor is further used to transmit the re-encoded multimedia file to the terminal device via the connection interface. The servo device according to item 9 of the patent application scope, wherein the processor re-encodes the multimedia file according to the decoding time information and the screen refresh time information of the multimedia file includes: according to a resolution information of the multimedia file Evaluate a picture drawing time information of the multimedia file; and re-encode the multimedia file according to the decoding time information, the picture refresh time information and the picture drawing time information. The servo device according to item 9 of the patent application scope, wherein the operation of re-encoding the multimedia file includes performing at least one of a file format conversion operation and a resolution adjustment operation, wherein the file format conversion operation includes the multimedia The file format of the file is converted from a first file format to a second file format, wherein the first file format is different from the second file format, and the resolution adjustment operation includes a resolution of the multimedia file from a The first resolution is adjusted to a second resolution, wherein the first resolution is different from the second resolution. The servo device as described in item 11 of the patent application scope, wherein the file format conversion operation is performed after the processor determines that the decoding time information is not less than the picture refresh time information, wherein the resolution adjustment operation is performed on the processor It is executed after determining that the sum of the decoding time information and the picture drawing time information of the multimedia file is not less than the picture refresh time information. A file management system includes: at least one terminal device; and a server device for storing a multimedia file, wherein the server device is further used to obtain a first terminal device in the at least one terminal device for multiple presets respectively The file format is used to decode a preset decoding time information of an image frame, wherein the server device is further used to store the default decoding time information, and the server device is further used to read the location according to the file format of the multimedia file One of the recorded default decoding time information is used as the decoding time information of the multimedia file, wherein the servo device is further used to re-encode the multimedia file according to the decoding time information and a picture refresh time information of the multimedia file, wherein The servo device is further used to transmit the re-encoded multimedia file to the first terminal device, wherein the first terminal device is used to play the re-encoded multimedia file.

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