CN112312164A - Video transcoding system based on distributed transcoding server - Google Patents
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234309—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 or from Quicktime to Realvideo
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/436—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation using parallelised computational arrangements
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Abstract
The invention relates to a video transcoding system based on a distributed transcoding server, which comprises terminal equipment, a multimedia resource application platform, a Web server, a resource management server, a transcoding scheduling server, a Job Tracker server, the distributed transcoding server and a Reduce Task server. The video transcoding system adopts a Hadoop framework, realizes scheduling management and data collection in the video transcoding system through the transcoding scheduling server, and respectively completes the division of a video file to be transcoded, the parallel transcoding of the fragment files and the merging of the transcoded fragment files by utilizing the Job Tracker server, the distributed transcoding server and the Reduce Task server, so that the transcoding speed is improved, the playing jam of terminal equipment or a multimedia resource application platform can not occur, good video playing experience is provided for users, and the video transcoding system is very suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a video transcoding system based on a distributed transcoding server.
Background
With the continuous development of new media technology and the rapid rise of video application software, the mode of acquiring information by people is transferred from the traditional television media to various terminal playing devices, and the convergence trend of a broadcast television network, a telecommunication network and the internet is more obvious. As the types of terminal playing devices are increasing day by day, such as video apps, mobile televisions, internet televisions, and the like, and the requirements of different types of terminal playing devices on the packaging format, the encoding format, the resolution ratio, and the like of videos are different, people have higher and higher requirements on smooth playing of the same video on different terminal playing devices or playing platforms, which leads to the need of providing faster and more flexible transcoding services for video operators, performing format conversion on videos with different packaging formats, different encoding formats, different resolutions, and the like to meet the needs of heterogeneous networks and multi-terminal environments, and providing better video playing experience for people, thereby occupying the opportunity in new media markets with increasingly strong competition.
Aiming at the video transcoding requirement, people provide a high-performance video transcoding server and a server cluster special for video transcoding, however, the special high-performance video transcoding server and the server cluster are expensive and difficult to meet the transcoding requirement of a large number of audio and video files, when a plurality of large video files need to be transcoded, the transcoding speed is obviously reduced, the video playing is blocked, the video watching experience of a user is seriously influenced, and the system is not suitable for large-scale popularization and application.
Disclosure of Invention
Based on this, it is necessary to provide a video transcoding system based on a distributed transcoding server, aiming at the problem that the transcoding speed is significantly reduced when the existing high-performance video transcoding server and server cluster transcode a plurality of large video files, and it is difficult to satisfy the efficient transcoding of a large number of large video files.
In order to solve the problems, the invention adopts the following technical scheme:
the utility model provides a video transcoding system based on distributed transcoding server, includes terminal equipment, multimedia resource application platform, Web server, resource management server, transcoding dispatch server, Job Tracker server, distributed transcoding server and Reduce Task server, wherein:
the terminal equipment and the multimedia resource application platform are respectively connected with the Web server, the Web server receives a first transcoding task request sent by the terminal equipment and a second transcoding task request automatically sent by the multimedia resource application platform after receiving an uploaded video file, and the first transcoding task request and the second transcoding task request both carry an appointed transcoding format of the video file to be transcoded;
the Web server sends the corresponding video file to be transcoded to the resource management server according to the first transcoding task request and/or the second transcoding task request, and the resource management server marks the video file to be transcoded and then generates a transcoding task;
the transcoding scheduling server is used for realizing scheduling management and data collection in a video transcoding system, polling the resource management server at regular time, and starting a transcoding service process and sending a corresponding video file to be transcoded to the Job Tracker server when the transcoding scheduling server detects that the resource management server has a newly added transcoding task;
the Job Tracker server divides the received video file to be transcoded, and distributes the divided fragment files to each node of the distributed transcoding server;
each node of the distributed transcoding server transcodes the fragment files distributed to each node according to the specified transcoding format;
the Reduce Task server merges the fragmented files after the completion of transcoding to obtain the transcoded file, and will the transcoded file is returned to the resource management server, the resource management server passes through the Web server returns the transcoded file to corresponding terminal equipment perhaps multimedia resource application platform.
Compared with the prior art, the invention has the following beneficial effects:
the video transcoding system based on the distributed transcoding server adopts a Hadoop framework, achieves scheduling management and data collection inside the video transcoding system through the transcoding scheduling server, and utilizes the Job Tracker server, the distributed transcoding server and the Reduce Task server to respectively complete segmentation of video files to be transcoded, parallel transcoding of fragment files and merging of the fragment files after transcoding is completed, so that the transcoding speed is increased, particularly for transcoding of a large number of video files, the transcoding speed has an obvious advantage, a terminal device or a multimedia resource application platform cannot generate playing jam, good video playing experience is provided for users, and the video transcoding system is very suitable for large-scale popularization and application.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a video transcoding system based on a distributed transcoding server according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a distributed transcoding server in the present invention;
FIG. 3 is a flow chart of a method for partitioning a Job Tracker server according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments, wherein the embodiments are used for explaining the present invention and are not used for limiting the scope of the present invention.
In one embodiment, the present invention provides a video transcoding system based on a distributed transcoding server, and as shown in fig. 1 and fig. 2, the video transcoding system includes a terminal device, a multimedia resource application platform, a Web server, a resource management server, a transcoding scheduling server, a Job Tracker server, a distributed transcoding server, and a Reduce Task server.
The terminal equipment and the multimedia resource application platform are respectively connected with the Web server, wherein the terminal equipment can be various equipment capable of storing video files, such as a hard disk, a CD, a VCD or a DVD, and also can be various equipment capable of playing the video files, such as a computer, an iPad, a smart phone, an Internet television and the like; the multimedia resource application platform is an application service platform capable of providing multimedia resources for users, the users can upload audio files, video files or other text files to the platform for the platform to add and call, and meanwhile, the users can download or preview the uploaded audio files, video files or other text files from the platform on line. When a video file to be transcoded of the terminal equipment needs to be transcoded, the terminal equipment sends a first transcoding task request to the Web server, or after the multimedia resource application platform receives an uploaded video file, the multimedia resource application platform automatically transcodes the format of the uploaded video file, and at the moment, the multimedia resource application platform automatically sends a second transcoding task request to the Web server; the Web server receives a first transcoding task request and a second transcoding task request which is automatically sent by a multimedia resource application platform after receiving an uploaded video file, wherein the first transcoding task request and the second transcoding task request both carry a specified transcoding format of the video file to be transcoded, the specified transcoding format is a format preset by a user and can be various mainstream audio and video formats at present, such as an rm format, an rmvb format, a wmv format, an mov format, an mts format, an mp4 format and the like.
And the Web server sends the corresponding video file to be transcoded to the resource management server according to the received first transcoding task request and/or the second transcoding task request, and the resource management server marks the video file to be transcoded and then generates a transcoding task. The resource management server comprises the functions of resource uploading, resource cataloging, resource retrieval, storage management, resource publishing, background transcoding and the like, can be realized by adopting a B/S (browser/Server) architecture, and generates a corresponding transcoding task for the transcoding scheduling server to view after marking a video file to be transcoded.
The transcoding scheduling server is used for achieving scheduling management and data collection inside the video transcoding system, regularly polls the resource management server and checks whether the resource management server has a newly added transcoding task, and when the transcoding scheduling server detects that the resource management server has the newly added transcoding task, the transcoding scheduling server starts a transcoding service process and sends a corresponding video file to be transcoded to the Job Tracker server.
And the Job Tracker server divides the received video file to be transcoded and distributes the divided fragment file to each node of the distributed transcoding server.
As a specific implementation manner, as shown in fig. 3, when the Job Tracker server segments the received video file to be transcoded, the method includes the following steps:
step S100: acquiring header information of a video file to be transcoded, wherein the header information comprises coding information, packaging information and timestamp information;
step S200: searching and confirming average division points of the video file to be transcoded, wherein the number of the average division points and the size of the divided fragment file can be set according to the size of the video file to be transcoded; since the video files to be transcoded are stored according to a certain data structure, when the video files to be transcoded are divided averagely, it cannot be guaranteed that an average division point is exactly located at an understanding point between frames, and therefore step S300 needs to be executed next;
step S300: searching key frames near the average segmentation point according to the data structure of the video file to be transcoded, adjusting the positions of the segmentation points according to the key frames, and determining the positions of the adjusted segmentation points;
step S400: and finally, segmenting the video file to be transcoded according to the adjusted segmentation points to obtain a plurality of segmented files, acquiring the head information of the video file to be transcoded when each node of the distributed transcoding server transcodes the segmented files, and sequentially adding the head information to each segmented file in the step.
Further, the decoding time stamp DTS and the display time stamp PTS are kept unchanged while header information is added to each slice file. The purpose of keeping the decoding time stamp DTS and the display time stamp PTS unchanged is that when the Reduce Task server merges the fragmented files after the transcoding is completed, the decoding time stamp DTS and the display time stamp PTS do not need to be rewritten, and only the header information needs to be removed and then the fragmented files are directly added, so that the merging speed of the fragmented files is increased, and the transcoding speed is further increased.
The distributed transcoding server comprises a plurality of nodes, such as a node 1, a node 2, … and a node n, wherein each node transcodes the respectively distributed fragment files according to a specified transcoding format set by a user to complete the transcoding work of the fragment files. Because each fragment file is distributed to the corresponding node for transcoding, parallel transcoding of a plurality of fragment files can be realized, and the transcoding speed is high.
Optionally, each node of the distributed transcoding server adopts a CUDA multithread to accelerate the transcoding process, in order to further increase the transcoding speed of the distributed transcoding server. The CUDA (computer Unified Device architecture) is a general parallel computing architecture derived from NVIDIA, and the architecture enables a GPU to solve complex computing problems, realize ultrahigh-performance operation, further realize acceleration of a transcoding process and improve transcoding efficiency.
And the Reduce Task server merges the transcoded fragmented files to obtain a transcoded file, and transmits the transcoded file after transcoding back to the resource management server, and the resource management server returns the transcoded file to the corresponding terminal equipment or the multimedia resource application platform through the Web server.
Further, when the Reduce Task server merges the fragmented files after the transcoding is completed, the method includes the following steps:
the method comprises the following steps: reserving the head information of the first transcoded fragmented file, and removing the head information of each of the other transcoded fragmented files;
step two: and after any one fragmented file with the head information removed is added to the adjacent previous fragmented file, and the complete fragmented file is added, so that the transcoding file can be obtained.
When the Reduce Task server merges the fragmented files after the transcoding is completed, the encoding and decoding do not need to be carried out again, the header information of the rest fragmented files except the first fragmented file only needs to be simply removed, and then the fragmented files are added, so that the merging speed of the fragmented files is high, and the overall transcoding speed of the video transcoding system is further improved.
The video transcoding system based on the distributed transcoding server provided by the embodiment adopts a Hadoop framework, the scheduling management and the data collection in the video transcoding system are realized through the transcoding scheduling server, the Job Tracker server, the distributed transcoding server and the Reduce Task server are used for respectively completing the segmentation of video files to be transcoded, the parallel transcoding of fragment files and the merging of the fragment files after the transcoding is completed, the transcoding speed is increased, particularly for the transcoding of a large number of video files, the transcoding speed has an obvious advantage, so that the playing jam of terminal equipment or a multimedia resource application platform can not occur, good video playing experience is provided for users, and the video transcoding system is very suitable for large-scale popularization and application.
As a specific implementation manner, when one node of the distributed transcoding server fails in transcoding or has an abnormal fault, the Job Tracker server reallocates the fragment file allocated by the node to other nodes for transcoding, freezes a driving thread of the node which fails in transcoding or has the abnormal fault, and sends abnormal node information to the transcoding scheduling server. The embodiment provides a distributed transcoding server exception handling mode, and the Job Tracker server can not distribute other fragment files to the node for transcoding any more by freezing the driving thread of the node, so that the time for redistributing the node to the fragment files is saved, and meanwhile, the node sends node exception information to a transcoding scheduling server for recording and storing, thereby facilitating the later-stage fault tracing. Optionally, when a transcoding of a node of the distributed transcoding server fails or an abnormal fault occurs, the Job Tracker server receives a line to restart the driving thread of the node which fails or has the abnormal fault, and if the restarting fails, the Job Tracker server refreezes the driving thread of the node.
As a specific implementation mode, the Reduce Task server is connected with the transcoding scheduling server, and the transcoding scheduling server receives the fragment file merging completion instruction returned by the Reduce Task server, records and stores the fragment file merging completion instruction, and is used for tracing the data in the later period.
As a specific implementation manner, the Web server is provided with a Web API interface for integrating with a third-party application system, and the third-party application system can read parameters, data and the like in the Web server by calling the Web API interface, so that the integration with the third-party application system is realized, and the performance of the third-party application system is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a video transcoding system based on distributed transcoding server which characterized in that, includes terminal equipment, multimedia resource application platform, Web server, resource management server, transcoding dispatch server, Job Tracker server, distributed transcoding server and Reduce Task server, wherein:
the terminal equipment and the multimedia resource application platform are respectively connected with the Web server, the Web server receives a first transcoding task request sent by the terminal equipment and a second transcoding task request automatically sent by the multimedia resource application platform after receiving an uploaded video file, and the first transcoding task request and the second transcoding task request both carry an appointed transcoding format of the video file to be transcoded;
the Web server sends the corresponding video file to be transcoded to the resource management server according to the first transcoding task request and/or the second transcoding task request, and the resource management server marks the video file to be transcoded and then generates a transcoding task;
the transcoding scheduling server is used for realizing scheduling management and data collection in a video transcoding system, polling the resource management server at regular time, and starting a transcoding service process and sending a corresponding video file to be transcoded to the Job Tracker server when the transcoding scheduling server detects that the resource management server has a newly added transcoding task;
the Job Tracker server divides the received video file to be transcoded, and distributes the divided fragment files to each node of the distributed transcoding server;
each node of the distributed transcoding server transcodes the fragment files distributed to each node according to the specified transcoding format;
the Reduce Task server merges the fragmented files after the completion of transcoding to obtain the transcoded file, and will the transcoded file is returned to the resource management server, the resource management server passes through the Web server returns the transcoded file to corresponding terminal equipment perhaps multimedia resource application platform.
2. The video transcoding system based on the distributed transcoding server as claimed in claim 1, wherein when the Job Tracker server divides the received video file to be transcoded, the method comprises the following steps:
acquiring header information of a video file to be transcoded, wherein the header information comprises coding information, packaging information and timestamp information;
searching and determining an average segmentation point of a video file to be transcoded;
searching key frames near the average division point according to a data structure of a video file to be transcoded, and adjusting the positions of the division points according to the key frames;
and segmenting the video file to be transcoded according to the adjusted segmentation points to obtain a plurality of segmented files, and adding the head information to each segmented file.
3. The video transcoding system based on the distributed transcoding server of claim 2, wherein,
when the header information is added to each slice file, the decoding time stamp and the display time stamp are kept unchanged.
4. The video transcoding system of claim 3, wherein the Reduce Task server merges the transcoded fragmented files, and comprises the following steps:
reserving the head information of the first transcoded fragmented file, and removing the head information of each of the other transcoded fragmented files;
and adding any one fragmented file with the header information removed to the next previous fragmented file.
5. The video transcoding system based on the distributed transcoding server of claim 1 or 2,
when one node of the distributed transcoding server fails in transcoding or has an abnormal fault, the Job Tracker server redistributes the fragment file distributed by the node to other nodes for transcoding, freezes a driving thread of the node which fails in transcoding or has the abnormal fault, and simultaneously sends node abnormal information to the transcoding scheduling server.
6. The video transcoding system based on the distributed transcoding server of claim 1 or 2,
reduce Task server with the transcoding dispatch server is connected, transcoding dispatch server receives the burst file that Reduce Task server returned merges and accomplishes the instruction, and right the burst file merges and accomplishes the instruction and takes notes and save.
7. The video transcoding system based on the distributed transcoding server of claim 1 or 2,
the Web server is provided with a WebAPI interface for integrating with a third-party application system.
8. The video transcoding system based on the distributed transcoding server of claim 1 or 2,
and each node of the distributed transcoding server adopts a CUDA multithreading accelerated transcoding process.
9. The video transcoding system based on the distributed transcoding server of claim 1 or 2,
the terminal equipment is any one of a hard disk, a CD, a VCD and a DVD.
10. The video transcoding system based on the distributed transcoding server of claim 1 or 2,
the specified transcoding format is an mp4 format.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953944A (en) * | 2021-02-23 | 2021-06-11 | 北京华宇信息技术有限公司 | Audio-video transcoding method based on MapReduce |
| CN113411586A (en) * | 2021-05-20 | 2021-09-17 | 北京睿芯高通量科技有限公司 | Transcoding system and block uploading method thereof |
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