CN102055964A - Transcoding method for multimedia file, and transcoder - Google Patents

Abstract

The present invention is applicable to the field of multimedia processing, and provides a multimedia file transcoding method and a transcoder. The method includes the following steps: receiving a source multimedia file and a transcoding parameter input by a user; Code parameter, search and download the corresponding target multimedia file from the peer-to-peer network. The embodiment of the present invention searches and downloads the target multimedia file transcoded according to the source multimedia file and the transcoding parameter from the peer-to-peer network according to the source multimedia file and the transcoding parameter, so that multiple users need to transcode according to the same transcoding parameter When transcoding the same source multimedia file, each user does not need to perform a transcoding operation, which greatly saves the transcoding resources of the multimedia file.

Description

Multimedia file transcoding method and transcoder

technical field

The invention belongs to the field of multimedia processing, and in particular relates to a multimedia file transcoding method and a transcoder.

Background technique

Today, with the rapid development of information, multimedia technology has become an indispensable and important part of people's work and study. With the continuous advancement of network technology, it has been further developed and has become the fastest-growing part of the information industry. In order to promote the further development of multimedia services and meet people's different needs for multimedia services in daily work and life, some standardization organizations have proposed a variety of audio and video coding standards for different business needs in society. Such as the H.263 standard proposed for video telephony and video conferencing services; the MPEG2 standard proposed for DVB, HDTV and DVD; the MPEG4 standard developed for streaming media services in the network; and the network-friendly H.264 that can provide high video compression performance standard etc.

Due to the simultaneous existence of multiple audio and video coding standards, as well as the different requirements for compression efficiency, decompression speed, and target devices used in code streams in multimedia applications, there are a variety of media files. File formats, video formats, compression formats vary. In order to effectively utilize existing multimedia resources, the prior art provides a transcoding technology for converting between multiple audio and video coding standards. The transcoding technology has been widely concerned by people day by day, and has been further researched and developed continuously.

This software or hardware tool that converts between multiple audio and video coding standards is called a transcoder. However, due to the variety of target devices, such as currently commonly used handheld devices include various types of mobile phones, various types of MP4\MP3\PSP and other handheld entertainment devices, etc., for ordinary users, it is difficult to Choose a set of transcoding parameters that are most suitable for your handheld device from among the extremely complex and professional transcoding parameters, and sometimes it is even difficult to choose the parameters that can be played on your handheld device, which invisibly improves the user's use of transcoding device threshold. In addition, the transcoder needs to occupy more CPU resources during the process of transcoding the source multimedia file according to the transcoding parameters to obtain the target multimedia file. When multiple users need to transcode the same source multimedia file according to the same transcoding parameters, serious waste of resources will be caused.

Contents of the invention

The purpose of the embodiment of the present invention is to provide a multimedia file transcoding method, aiming at solving the problem of serious waste of resources when performing file transcoding in the existing multimedia file transcoding method.

The embodiment of the present invention is realized like this, a kind of multimedia file transcoding method, described method comprises the following steps:

Receive the source multimedia file and transcoding parameters input by the user;

According to the source multimedia file and the transcoding parameters, the corresponding target multimedia file is searched and downloaded from the peer-to-peer network.

Preferably, the step of searching and downloading the corresponding target multimedia file from the peer-to-peer network according to the source multimedia file and transcoding parameters is specifically:

Send a target file query request to the query server in the peer-to-peer network, and the target file query request carries source multimedia file information and transcoding parameter information, so that the query server returns a list of clients storing active multimedia files and transcoding parameters;

The target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameters is downloaded from the clients in the client list returned by the query server.

Preferably, the step of searching and downloading the corresponding target multimedia file from the peer-to-peer network according to the source multimedia file and transcoding parameters is specifically:

Send a target file query request to the client in the pre-stored client list, the target file query request carries source multimedia file information and transcoding parameter information, so that the client that receives the target file query request returns the stored A client list of the source multimedia files and transcoding parameters;

The target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameters is downloaded from the clients in the returned client list.

Preferably, the method further comprises the steps of:

When no corresponding target multimedia file is found from the peer-to-peer network according to the source multimedia file and transcoding parameters, directly perform transcoding processing on the source multimedia file according to the transcoding parameters to generate a target multimedia file.

Preferably, the method further comprises the steps of:

When the corresponding target multimedia file is not found from the peer-to-peer network within the preset time, the source multimedia file is directly transcoded according to the transcoding parameters to generate the target multimedia file.

Preferably, before the step of searching and downloading the corresponding target multimedia file from the peer-to-peer network according to the source multimedia file and transcoding parameters, the method further includes:

Estimating the completion time of transcoding according to the source multimedia file and transcoding parameters;

When the estimated transcoding completion time exceeds the preset time, perform the step of searching and downloading the corresponding target multimedia file from the peer-to-peer network according to the source multimedia file and the transcoding parameters;

When the estimated transcoding completion time does not exceed the preset time, the source multimedia file is directly transcoded according to the transcoding parameter to generate the target multimedia file.

Preferably, after the step of directly transcoding the source multimedia file according to the transcoding parameters to generate a target multimedia file, the method further includes the following steps:

The generated target multimedia file is shared to the peer-to-peer network for downloading by other users in the peer-to-peer network.

Another object of the embodiments of the present invention is to provide a transcoder, the transcoder comprising:

An information receiving unit, configured to receive source multimedia files and transcoding parameters input by the user;

The point-to-point network management unit is configured to search and download the corresponding target multimedia file from the point-to-point network according to the source multimedia file and transcoding parameters received by the information receiving unit.

Preferably, the point-to-point network management unit includes:

The first query request sending module is used to send a target file query request to the query server in the peer-to-peer network, and the target file query request carries source multimedia file information and transcoding parameter information, so that the query server returns and stores the source multimedia file and client list of transcoding parameters;

The first file downloading module is configured to download the target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameters from the clients in the client list returned by the query server.

Preferably, the point-to-point network management unit includes:

The second query request sending module is used to send a target file query request to the client in the pre-stored client list, and the target file query request carries source multimedia file information and transcoding parameter information, so that the target file can be received The client of the file query request returns a list of clients storing the source multimedia files and transcoding parameters;

The second file download module is configured to download the target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameters from the clients in the returned client list.

Preferably, the transcoder also includes:

The transcoding time estimating unit is used for estimating the transcoding completion time according to the source multimedia file and transcoding parameters.

A transcoding processing unit, configured to perform transcoding processing on the source multimedia file directly according to the transcoding parameters received by the information receiving unit when the transcoding completion time estimated by the transcoding time estimation unit exceeds a preset time, to generate Target multimedia file.

Preferably, when the transcoding processing unit does not find the corresponding target multimedia file from the peer-to-peer network, or when the peer-to-peer network management unit fails to find the corresponding target multimedia file within the preset time When the corresponding target multimedia file is received, the source multimedia file is directly transcoded according to the transcoding parameters received by the information receiving unit to generate the target multimedia file.

Preferably, the transcoding processing unit includes:

The audio and video separation module is used to analyze the source multimedia file received by the information receiving unit, and separate the audio stream and the video stream;

A video transcoding module, configured to transcode the video stream separated by the audio-video separation module according to the transcoding parameters received by the information receiving unit;

An audio transcoding module, configured to transcode the audio stream separated by the audio-video separation module according to the transcoding parameters received by the information receiving unit;

The target file generating module is used to synthesize the video stream transcoded by the video transcoding module and the audio stream transcoded by the audio transcoding module to generate a target multimedia file.

Preferably, the transcoder also includes:

A file sharing unit, configured to share the target multimedia file generated by the transcoding processing unit to the peer-to-peer network for downloading by other users in the peer-to-peer network.

In the embodiment of the present invention, when the source multimedia file and transcoding parameters input by the user are received, according to the source multimedia file and the transcoding parameters, the source multimedia file and transcoding parameters obtained by transcoding are searched and downloaded from the peer-to-peer network. Target multimedia files, so that when multiple users need to transcode the same source multimedia file according to the same transcoding parameters, each user does not need to perform transcoding operations, which greatly saves transcoding resources for multimedia files.

Description of drawings

Fig. 1 is the implementation flowchart of the multimedia file transcoding method provided by the embodiment of the present invention;

Fig. 2 is a structural block diagram of a transcoder provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiment of the present invention, when the source multimedia file and transcoding parameters input by the user are received, according to the source multimedia file and the transcoding parameters, the source multimedia file and transcoding parameters obtained by transcoding are searched and downloaded from the peer-to-peer network. target multimedia files, so that when multiple users need to transcode the same source multimedia file according to the same transcoding parameters, each user does not need to perform transcoding operations, which saves resources.

Fig. 1 shows the implementation process of the multimedia file transcoding method provided by the embodiment of the present invention, which is described in detail as follows:

In step S101, a source multimedia file and a transcoding parameter input by a user are received.

The transcoding parameters include but are not limited to file container format, video format, video size, video frame rate, video bit rate, audio format, audio bit rate, audio sampling rate, number of audio channels, etc.

In step S102, according to the source multimedia file and the transcoding parameters, the corresponding target multimedia file is searched and downloaded from the peer-to-peer network. When there is a query server in the peer-to-peer network, step S102 is specifically:

A1, send a target file query request to the query server in the point-to-point network, the target file query request carries source multimedia file information and transcoding parameter information, so that the query server returns the client list that stores the source multimedia file and transcoding parameters .

In this embodiment of the present invention, the source multimedia file information carried in the target file query request may be a hash (Hash) value of the source multimedia file. The transcoding parameter information carried in the target file query request may be a playback effect. In this case, the corresponding relationship between the playback effect and the transcoding parameter is established in advance. Examples are as follows:

When the playback effect is "best playback effect", the corresponding transcoding parameters are as follows: video format is, video size is, video frame rate, video bit rate, audio format is, audio bit rate, audio sampling rate is, the number of audio channels is; when the playback effect is "worst playback effect", the corresponding transcoding parameters are as follows: video format is, video size is, video frame rate, video bit rate, audio format is, The audio bit rate, audio sampling rate, and audio channel number are.

A2. Download the target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameter from the clients in the client list returned by the query server.

In another embodiment of the present invention, after step B, the method also includes the following steps:

A3. After the download is successful, the query server adds the client that has downloaded the target multimedia file to the client list that stores the Hash value and transcoding parameters of the source multimedia file.

Examples are as follows:

Assume that the name of the source multimedia file that user A needs to transcode is "hacker.avi", and the selected transcoding parameter is "the target device is PSP, with the best playback effect". When querying, the transcoding parameter will be mapped to a set of integers In the above, for example, "the target device is PSP, the playback effect is the best" may correspond to the integer 1, while "the target device is the PSP, the playback effect is the worst" may correspond to the integer 2, etc.

After the client of user A connects to the query server, it sends a target file query request to the query server. The target file query request carries the Hash value and transcoding parameters of the source multimedia file, and the query server returns other files that store the source multimedia file. The client list of the Hash value and transcoding parameters is given to the client of user A. If the query server cannot find other clients with the Hash value and transcoding parameters of the source multimedia file, the download failure information will be returned. The client of user A downloads the target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameter from the clients in the client list returned by the query server. After the download is completed, the query server adds the client of user A to the list of clients with the Hash value of the source multimedia file and the transcoding parameters.

When there is no query server in the peer-to-peer network, step S102 is specifically:

B1. Send a target file query request to the client in the pre-stored client list, the target file query request carries source multimedia file information and transcoding parameter information, so that the client that receives the target file query request returns the stored information. A list of clients for this source multimedia file and transcoding parameters.

In the embodiment of the present invention, when the client list that has this source multimedia file and transcoding parameter is stored in the client that receives target file query request, then directly return this client list; When receiving target file query request When the client list of the source multimedia file and transcoding parameters is not stored in the client, send the target file query request to the client that has received the target file query request to the client in its pre-stored client list , the target file query request carries source multimedia file information and transcoding parameter information, until the client that stores the source multimedia file and transcoding parameters is found, if no client is found that stores the source multimedia file and transcoding parameters When the client of the parameter is set, the download failure information will be returned.

B2. Download the target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameter from the clients in the returned client list.

In another embodiment of the present invention, after step B2, the method further includes the following steps:

B3. After the download is successful, notify the clients in the pre-stored client list to add the client that has downloaded the target multimedia file to the client list that stores the Hash value and transcoding parameters of the source multimedia file.

Examples are as follows:

Assume that the name of the source multimedia file that user A needs to transcode is "hacker.avi", and the selected transcoding parameter is "the target device is PSP, with the best playback effect". When querying, the transcoding parameter will be mapped to a set of integers In the above, for example, "the target device is PSP, the playback effect is the best" may correspond to the integer 1, while "the target device is the PSP, the playback effect is the worst" may correspond to the integer 2, etc.

User A's client will store some IP lists of other clients locally, and the source multimedia file of user A's client sends a target file query request to other clients in this IP list, and the target file query request carries the source multimedia file Hash value and transcoding parameters, if the adjacent client has stored the list of clients with the hash value and transcoding parameters of the source multimedia file, it will directly return to the client of user A, if not, the adjacent client will then Send a target file query request to the client in its stored client list, the target file query request carries the Hash value and transcoding parameters of the source multimedia file, until the final result is returned to the client of user A. If there are no other clients that have the Hash value and the transcoding parameters of the source multimedia file, a message that the download fails will be returned to the client of user A. After the download is completed, the client of user A notifies all its adjacent clients to add the client of user A to the list of clients with the Hash value of the source multimedia file and the transcoding parameters.

Of course, in the embodiment of the present invention, other algorithms for finding the target multimedia file can also be set according to the specific implementation of the transcoder, and the above examples are not limited. In the embodiment of the present invention, a point-to-point transmission network with other users is pre-established, and when the source multimedia file and transcoding parameters input by the user are received, the corresponding target multimedia file is searched from the point-to-point network, wherein the corresponding target multimedia file The file refers to a multimedia file obtained by performing a transcoding operation on the source multimedia file according to the transcoding parameters.

In another embodiment of the present invention, when the corresponding target multimedia file is not found from the peer-to-peer network, the source multimedia file is directly transcoded according to the transcoding parameters to generate the target multimedia file. The specific process belongs to the prior art and will not be repeated here.

When the corresponding target multimedia file is found from the peer-to-peer network, the corresponding target multimedia file can be directly downloaded from the peer-to-peer network, and a human-computer interaction interface can also be output, so that the user can select the multimedia file to convert through the human-computer interaction interface. transcoding method, and download the corresponding target multimedia file from the peer-to-peer network according to the selected multimedia file transcoding method, or directly transcode the source multimedia file according to the transcoding parameters to generate the target multimedia file.

When the transmission speed of the peer-to-peer network is slow, it takes a long time to find the corresponding target multimedia file from the peer-to-peer network, which will bring poor user experience to the user. In order to avoid this problem, in another embodiment of the present invention In the example, the method also includes the following steps:

When the corresponding target multimedia file is not found from the peer-to-peer network within the preset time, the source multimedia file is directly transcoded according to the transcoding parameters to generate the target multimedia file.

Although it takes more CPU resources to transcode the source multimedia files directly according to the transcoding parameters, it may take a long time to find and download the corresponding target multimedia files directly from the peer-to-peer network when the network speed is slow. time, in order to find a better balance between the transcoding speed and the resources consumed by transcoding, in another embodiment of the present invention, before step S102, the method further includes the following steps:

Estimate the transcoding completion time according to the source multimedia file and the transcoding parameters, and when the estimated transcoding completion time exceeds the preset time, execute step S102; otherwise, directly perform transcoding processing on the source multimedia file according to the transcoding parameters, and obtain Target multimedia file. The steps for estimating the completion time of transcoding according to the source multimedia file and transcoding parameters are as follows:

Transcoding completion time = reference time × corresponding coefficient of source multimedia file resolution × source multimedia file duration × corresponding coefficient of target file format × corresponding coefficient of target file resolution × corresponding coefficient of target file encoding format × user PC computing power The corresponding coefficient. The corresponding coefficient is the average value after testing on several test machines. For example, if the corresponding coefficient of the target file encoding format is H.263 is defined as 1, then when the target file encoding format is H.264, due to the complexity of H.264 Higher than H.263, it can be defined as 2.3.

Of course, in another embodiment of the present invention, other transcoding estimation algorithms can also be set according to specific transcoding requirements to estimate the transcoding completion time, and the above examples are not limited.

In order to realize the sharing of the target multimedia file, in another embodiment of the present invention, after the step of obtaining the target multimedia file by directly transcoding the source multimedia file according to the transcoding parameters, the method also includes the following steps:

Share the target multimedia file obtained by transcoding to the peer-to-peer network so that other users in the peer-to-peer network can download it.

Fig. 2 shows the structure of the transcoder provided by the embodiment of the present invention, and for the convenience of description, only the parts related to the embodiment of the present invention are shown. in:

The information receiving unit 21 receives the source multimedia file and transcoding parameters input by the user.

The transcoding parameters include but are not limited to file container format, video format, video size, video frame rate, video bit rate, audio format, audio bit rate, audio sampling rate, number of audio channels, etc.

The peer-to-peer network management unit 22 searches and downloads the corresponding target multimedia file from the peer-to-peer network according to the source multimedia file and the transcoding parameters received by the information receiving unit 21 .

In the embodiment of the present invention, the point-to-point network management unit 22 establishes a point-to-point transmission network with other users when the transcoder is started or when the information receiving unit 21 receives the source multimedia file and transcoding parameters. The corresponding target multimedia file refers to a multimedia file obtained by performing a transcoding operation on the source multimedia file according to the transcoding parameters.

In the embodiment of the present invention, the P2P network management unit 22 includes a first query request sending module (not shown in the figure) and a first file downloading module (not shown in the figure). in:

The first query request sending module sends a target file query request to the query server in the peer-to-peer network, and the target file query request carries source multimedia file information and transcoding parameter information, so that the query server returns and stores the source multimedia file and transcoding parameter information list of clients.

In this embodiment of the present invention, the source multimedia file information carried in the target file query request may be a hash (Hash) value of the source multimedia file. The transcoding parameter information carried in the target file query request may be a playback effect. In this case, the corresponding relationship between the playback effect and the transcoding parameter is established in advance.

The first file downloading module downloads the target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameter from the clients in the client list returned by the query server.

In another embodiment of the present invention, the P2P network management unit 22 includes a second query request sending module (not shown in the figure) and a second file downloading module (not shown in the figure). in:

The second query request sending module sends a target file query request to the client in the pre-stored client list, and the target file query request carries source multimedia file information and transcoding parameter information, so that the client who receives the target file query request The client returns a list of clients storing the source multimedia file and transcoding parameters.

In the embodiment of the present invention, when the client list that has this source multimedia file and transcoding parameter is stored in the client that receives target file query request, then directly return this client list; When receiving target file query request When the client list of the source multimedia file and transcoding parameters is not stored in the client, send the target file query request to the client that has received the target file query request to the client in its pre-stored client list , the target file query request carries source multimedia file information and transcoding parameter information, until the client that stores the source multimedia file and transcoding parameters is found, if no client is found that stores the source multimedia file and transcoding parameters When the client of the parameter is set, the download failure information will be returned.

The second file download module downloads the target multimedia file obtained by transcoding the source multimedia file by using the transcoding parameter from the clients in the returned client list.

When the network speed is slow, it may take a long time to find and download the corresponding target multimedia files directly from the peer-to-peer network. In order to find a better balance between the transcoding speed and the resources consumed by transcoding, In another embodiment of the present invention, the transcoder further includes a transcoding time estimation unit 23 and a transcoding processing unit 24 . in:

The transcoding time estimating unit 23 estimates the transcoding completion time according to the source multimedia file and transcoding parameters. Wherein the transcoding time estimation unit 23 estimates the specific process of the transcoding completion time according to the source multimedia file and the transcoding parameters as follows:

Transcoding completion time = reference time × corresponding coefficient of source multimedia file resolution × source multimedia file duration × corresponding coefficient of target file format × corresponding coefficient of target file resolution × corresponding coefficient of target file encoding format × user PC computing power The corresponding coefficient. The corresponding coefficient is the average value after testing on several test machines. Of course, other transcoding estimation algorithms can also be set according to the specific requirements of transcoding to estimate the completion time of transcoding, not limited to the above examples. The transcoding processing unit 24 directly performs transcoding processing on the source multimedia file according to the transcoding parameters to generate a target multimedia file. In the embodiment of the present invention, when the transcoding completion time estimated by the transcoding time estimation unit 23 exceeds the preset time, the transcoding processing unit 24 directly performs transcoding processing on the source multimedia file according to the transcoding parameters to obtain the target multimedia file. document. The specific process belongs to the prior art and will not be repeated here.

In another embodiment of the present invention, when the peer-to-peer network management unit 22 does not find the corresponding target multimedia file from the peer-to-peer network, the transcoding processing unit 24 is triggered. That is, when the P2P network management unit 22 does not find the corresponding target multimedia file from the P2P network, the transcoding processing unit 24 directly performs transcoding processing on the source multimedia file according to the transcoding parameters to generate the target multimedia file.

In another embodiment of the present invention, when the transmission speed of the peer-to-peer network is slow, it takes a long time to find the corresponding target multimedia file from the peer-to-peer network, which will bring poor user experience to the user. In order to avoid this To solve this problem, in another embodiment of the present invention, when the peer-to-peer network management unit 22 fails to find the corresponding target multimedia file from the peer-to-peer network within a preset time, the transcoding processing unit 24 is triggered. That is, when the transcoding processing unit 24 does not find the corresponding target multimedia file from the peer-to-peer network within the preset time, the transcoding processing unit 24 directly performs transcoding processing on the source multimedia file according to the transcoding parameters to generate the target multimedia file .

The transcoding processing unit 24 includes an audio and video separation module 241 , a video transcoding module 242 , an audio transcoding module 243 and an object file generation module 244 . in:

The audio and video separation module 241 analyzes the source multimedia file received by the information receiving unit 21, and separates the audio stream and the video stream. The specific process belongs to the prior art and will not be repeated here.

The video transcoding module 242 performs transcoding processing on the video stream separated by the audio and video separation module 241 according to the transcoding parameters received by the information receiving unit 21 . The specific process belongs to the prior art and will not be repeated here.

The audio transcoding module 243 performs transcoding processing on the audio stream separated by the audio-video separation module 241 according to the transcoding parameters received by the information receiving unit 21 . The specific process belongs to the prior art and will not be repeated here.

The target file generating module 244 synthesizes the video stream transcoded by the video transcoding module 242 and the audio stream transcoded by the audio transcoding module 243 to generate a target multimedia file. The specific process belongs to the prior art and will not be repeated here.

In order to realize the sharing of target multimedia files, in another embodiment of the present invention, the transcoder further includes a file sharing unit 25 . The file sharing unit 25 shares the target multimedia file generated by the transcoding processing unit 24 to the peer-to-peer network, so that other users in the peer-to-peer network can download it.

In the embodiment of the present invention, when the source multimedia file and transcoding parameters input by the user are received, the corresponding target multimedia file is searched and downloaded from the peer-to-peer network according to the source multimedia file and the transcoding parameter, so that multiple users can When the same source multimedia file needs to be transcoded according to the same transcoding parameter, each user does not need to perform the transcoding operation, which saves resources. At the same time, by estimating the completion time of transcoding, and when the estimated completion time of transcoding exceeds the preset time, according to the source multimedia file and transcoding parameters, find and download the corresponding target multimedia file from the peer-to-peer network. When the completion time does not exceed the preset time, the source multimedia file is directly transcoded according to the transcoding parameters to generate the target multimedia file, so as to find a better balance between the transcoding speed and the resources consumed by transcoding. The degree saves resources for users, and at the same time guarantees the speed of getting target multimedia files.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (14)

1. a multimedia file code-transferring method is characterized in that, described method comprises the steps:

Receive the source multimedia file and the transcoding parameter of user's input;

According to described source multimedia file and transcoding parameter, from point to point network, search and download corresponding target multimedia file.

2. the method for claim 1 is characterized in that, and is described according to described source multimedia file and transcoding parameter, searches and downloads corresponding target multimedia files and be specially from point to point network:

Querying server in point to point network sends the file destination query requests, described file destination query requests is carried source multimedia document information and transcoding parameter information, so that querying server returns the client side list of active multimedia file of storage and transcoding parameter;

Download in the client from the client side list that querying server returns and adopt described transcoding parameter that described source multimedia file is carried out the target multimedia file that transcoding obtains.

3. the method for claim 1 is characterized in that, and is described according to described source multimedia file and transcoding parameter, searches and downloads corresponding target multimedia files and be specially from point to point network:

Client in the client side list of storage in advance sends the file destination query requests, described file destination query requests is carried source multimedia document information and transcoding parameter information, returns the client side list that stores described source multimedia file and transcoding parameter so that receive the client of described file destination query requests;

Download in the client from the client side list of returning and adopt described transcoding parameter that described source multimedia file is carried out the target multimedia file that transcoding obtains.

4. the method for claim 1 is characterized in that, described method also comprises the steps:

When according to described source multimedia file and transcoding parameter, when from point to point network, not finding corresponding target multimedia file, directly described source multimedia file is carried out transcoding and handle according to described transcoding parameter, generate the target multimedia file.

5. the method for claim 1 is characterized in that, described method also comprises the steps:

When in the default time, from point to point network, not finding corresponding target multimedia file, directly described source multimedia file is carried out transcoding and handle according to described transcoding parameter, generate the target multimedia file.

6. the method for claim 1 is characterized in that,, searches from point to point network and downloads before the corresponding target multimedia files according to described source multimedia file and transcoding parameter described, and described method also comprises:

According to described source multimedia file and transcoding parameter estimation transcoding deadline;

When transcoding deadline that estimation obtains surpasses the default time, carry out describedly according to described source multimedia file and transcoding parameter, from point to point network, search and download the target multimedia files of correspondence;

When the transcoding deadline that estimation obtains does not surpass the default time, directly described source multimedia file is carried out transcoding and handle according to described transcoding parameter, generate the target multimedia file.

7. as the described method of the arbitrary claim of claim 4 to 6, it is characterized in that, directly according to described transcoding parameter described source multimedia file is carried out the transcoding processing described, generate after the target multimedia files, described method also comprises the steps:

The target multimedia file that generates is shared to point to point network, to offer other user's download in the point to point network.

8. a transcoder is characterized in that, described transcoder comprises:

Information receiving unit is used to receive source multimedia file and the transcoding parameter that the user imports;

The point to point network administrative unit is used for source multimedia file and transcoding parameter according to described information receiving unit reception, searches and download corresponding target multimedia file from point to point network.

9. transcoder as claimed in claim 8 is characterized in that, described point to point network administrative unit comprises:

The first query requests sending module, be used for sending the file destination query requests to the querying server of point to point network, described file destination query requests is carried source multimedia document information and transcoding parameter information, so that querying server returns the client side list of active multimedia file of storage and transcoding parameter;

The first file download module is used for downloading the client of the client side list returned from querying server and adopts described transcoding parameter that described source multimedia file is carried out the target multimedia file that transcoding obtains.

10. transcoder as claimed in claim 8 is characterized in that, described point to point network administrative unit comprises:

The second query requests sending module, be used for sending the file destination query requests to the client of the client side list of storing in advance, described file destination query requests is carried source multimedia document information and transcoding parameter information, returns the client side list that stores described source multimedia file and transcoding parameter so that receive the client of described file destination query requests;

The second file download module is used for downloading from the client of the client side list returned and adopts described transcoding parameter that described source multimedia file is carried out the target multimedia file that transcoding obtains.

11. transcoder as claimed in claim 8 is characterized in that, described transcoder also comprises:

Transcoding time estimation unit was used for according to source multimedia file and transcoding parameter estimation transcoding deadline.

The transcoding processing unit, be used for when the transcoding deadline that the estimation of described transcoding time estimation unit obtains surpasses Preset Time, directly the transcoding parameter that receives according to described information receiving unit is carried out the transcoding processing to the source multimedia file, generates the target multimedia file.

12. transcoder as claimed in claim 11, it is characterized in that, when described transcoding processing unit does not find corresponding target multimedia file in described point to point network administrative unit from point to point network, perhaps when described point to point network administrative unit does not find corresponding target multimedia file from point to point network in the default time, directly the transcoding parameter that receives according to described information receiving unit is carried out the transcoding processing to the source multimedia file, generates the target multimedia file.

13. transcoder as claimed in claim 11 is characterized in that, described transcoding processing unit comprises:

The audio frequency and video separation module is used for the source multimedia file that described information receiving unit receives is resolved, and isolates audio stream and video flowing;

The video code conversion module, the transcoding parameter that is used for receiving according to described information receiving unit is carried out transcoding to the isolated video flowing of described audio frequency and video separation module and is handled;

Audio frequency transcoding module, the transcoding parameter that is used for receiving according to described information receiving unit is carried out transcoding to the isolated audio stream of described audio frequency and video separation module and is handled;

The file destination generation module is used for the audio stream behind video flowing behind the described video code conversion module transcoding and the audio frequency transcoding module transcoding is synthesized, and generates the target multimedia file.

14., it is characterized in that described transcoder also comprises as the described transcoder of the arbitrary claim of claim 8 to 13:

File sharing unit is used for the target multimedia file that described transcoding processing unit generates is shared to point to point network, to offer other user's download in the point to point network.

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