CN102364952A - Method for processing audio and video synchronization in simultaneous playing of a plurality of paths of audio and video - Google Patents
Method for processing audio and video synchronization in simultaneous playing of a plurality of paths of audio and video Download PDFInfo
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Abstract
The invention relates to a method for processing audio and video synchronization in the simultaneous playing of a plurality of paths of audio and video. The requirements of multi-user communication application on the simultaneous synchronization of the plurality of paths of audio and video cannot be met by a conventional audio and video synchronization technology. The method provided by the invention comprises the following steps of: each user acquires own audio and video data, compresses the acquired audio and video data into audio and video compressed packets, marks timestamps on the audio and video compressed packets and transmits the audio and video compressed packets to a server; the server decompresses and mixes the audio and video compressed packets received from each user, records the timestamps corresponding to all the audio compressed packets participating in the mixing in mixing results, compresses the audio compressed packets into mixed compressed packets, transmits the mixed compressed packets to clients and directly transmits the video compressed packets to the clients; and after receiving the mixed compressed packets and the video compressed packets, each client decompresses the mixed compressed packets, sequentially plays the decompressed audio data, and displays video frames in corresponding video compressed packets according to the principle of driving video by audio. By the method, synchronization relationships between all the audio and the video can be integrally stored.
Description
Technical field
The invention belongs to technical field of computer multimedia, relate to the method for multichannel audio-video frequency being handled through after the Network Transmission, specifically is the method that a kind of multichannel audio-video frequency is handled audio-visual synchronization when playing simultaneously.
Background technology
Along with the develop rapidly of current internet broadband technology and multimedia information technology, network-multimedia application has become the important content that internet uses.Particularly in the network teleconference,, need play simultaneously multichannel audio-video frequency owing to relate to the interbehavior between many people.This moment, each road audio frequency and video all needed synchronously, otherwise can't accomplish the effect of " labial is synchronous ", the fluency that influence is linked up.Traditional audio-visual synchronization technology is with timestamp of each mark of audio frequency and video bag, when playing, carries out synchronously according to this timestamp.This mode can only work in the situation of one road audio frequency and one road video, can't operate as normal under the situation of MCVF multichannel voice frequency and multi-channel video, and can not satisfy people more than this type of video conference and link up application multichannel audio-video frequency is carried out synchronous requirement simultaneously.
Summary of the invention
The objective of the invention is deficiency, a kind of multi-channel video method for synchronous that drives based on voice playing is provided to prior art.
The concrete steps of the inventive method are:
Step (1). each user obtains audio, video data separately respectively and Voice & Video is compressed separately; Is that unit is divided into audio data unit with the voice data of gathering with 10～120 milliseconds, and each audio data unit is compressed into the audio compression bag, each audio compression bag mark collection client machine timestamp constantly; Each frame in the video data is compressed into the video compression bag, each video compression bag mark collection client machine timestamp constantly; Each audio compression bag and each video compression bag are sent to server;
The method that each user obtains audio, video data separately respectively comprises through the equipment collection and from media file, obtains; As passing through the equipment collection, the moment of then described timestamp for gathering; As from media file, obtaining, playback of media files or decompress(ion) assembly can be provided with timestamp for data, and this timestamp is the moment that relative media file begins, and converting into current computer is the timestamp of standard constantly.
Step (2). audio mixing behind each user's that server will receive the audio compression bag decompress(ion), the audio compression bag time corresponding of all participation audio mixings of record is stabbed in the audio mixing result then, is compressed into the audio mixing compressed package, sends to client; The video compression bag directly sends to client.
N user U1, U2 ..., UN, each user has one road audio frequency, total N road audio frequency, be respectively A1, A2 ..., AN; Server needs audio mixing to go out N+1 road audio frequency, is respectively:
The 0 the tunnel. comprised all audio frequency, be designated as M0,
The 1 the tunnel. other all audio frequency except that A1, be designated as M1,
The 2 the tunnel. other all audio frequency except that A2, be designated as M2,
…、
The N road. other all audio frequency except that AN are designated as MN.
The every road audio frequency that generates all need it is corresponding N or the timestamp of source, N-1 road audio frequency write in this road audio frequency, this audio pack will have N or N-1 timestamp, and the pairing source of these timestamps audio frequency.
After generating this N+1 road audio frequency, M0 is sent to the user that all do not send audio frequency, M1 sends to U1, and M2 sends to U2, and by that analogy, the audio content that sends to each user does not comprise this user's audio frequency.
Step (3). after each client receives audio mixing compressed package and video compression bag,,, show the frame of video in the corresponding video compression bag then according to the principle of audio driven video with played in order behind the audio mixing compressed package decompress(ion).
The content that each client receives is the N road video compression bag of one road audio mixing compressed package and server forwards; Carry out through the audio driven video during broadcast, audio compression bag of promptly every broadcast, write down all timestamps of comprising in this audio compression bag (U, A) When playing X user's video, take out the corresponding video time stamp of this road video frame to be play (UX, VX); (UX AX), compares VX and AX the same user's of the audio frame that taking-up was simultaneously play recently timestamp; If VX is more than or equal to AX, represent that then video content after audio content, can play; And if VX less than AX; According to audio driven video principle, represent that this frame of video does not also arrive the moment of playing, need therefore to wait for that broadcast judgement next time determines whether and can play.
The inventive method is tie with the audio time stamp, with multi-channel video and audio sync, reach all videos all can with the effect of audio frequency " labial is synchronous ".The inventive method sound intermediate frequency is when the server audio mixing; Do not use single timestamp to come audio mixing compressed package of mark; But the timestamp that will participate in the MCVF multichannel voice frequency of this audio mixing compressed package is all preserved; As the timestamp of audio mixing compressed package, so just intactly preserved the synchronized relation between all Voice & Videos.
Embodiment
Handle the method for audio-visual synchronization when a kind of multichannel audio-video frequency is play simultaneously, concrete steps are:
Step (1). each user obtains audio, video data separately respectively and Voice & Video is compressed separately; Is that unit is divided into audio data unit with the voice data of gathering with 10～120 milliseconds, and each audio data unit is compressed into the audio compression bag, each audio compression bag mark collection client machine timestamp constantly; Each frame in the video data is compressed into the video compression bag, each video compression bag mark collection client machine timestamp constantly; Each audio compression bag and each video compression bag are sent to server.
The method that each user obtains audio, video data separately respectively comprises through the equipment collection and from media file, obtains; As passing through the equipment collection, the moment of then described timestamp for gathering; As from media file, obtaining, playback of media files or decompress(ion) assembly can be provided with timestamp for data, and this timestamp is the moment that relative media file begins, and converting into current computer is the timestamp of standard constantly.
Video processing then is that the video with input is unit with the frame, use the video encoder compression after, according to network condition, the size (being generally 400～1400 bytes) and the timestamp of this frame of video that cut into suitable transmission send to server together.For making things convenient for the receiving terminal ordering and judge whether that the packet loss phenomenon is arranged in transmission course, audio frequency and video Bao Jun has sequence number.Sequence number is that 2 bytes increase progressively, and restarts from 0 above after the maximum.For improving the user experience of bandwidth when relatively poor, audio, video data uses different connections to send, and when bandwidth is not enough, audio frequency connects because the relative video connection of data is fewer, is protected easily like this.And our mutual main means are through audio frequency, and in general video is supplementary means, do like this to let audio frequency relatively more smooth, reduce the influence to the user.
Step (2). audio mixing behind each user's that server will receive the audio compression bag decompress(ion), the audio compression bag time corresponding of all participation audio mixings of record is stabbed in the audio mixing result then, is compressed into the audio mixing compressed package, sends to client; The video compression bag directly sends to client.
N user U1, U2 ..., UN, each user has one road audio frequency, total N road audio frequency, be respectively A1, A2 ..., AN; Server needs audio mixing to go out N+1 road audio frequency, is respectively:
The 0 the tunnel. comprised all audio frequency, be designated as M0,
The 1 the tunnel. other all audio frequency except that A1, be designated as M1,
The 2 the tunnel. other all audio frequency except that A2, be designated as M2,
…、
The N road. other all audio frequency except that AN are designated as MN.
The every road audio frequency that generates all need it is corresponding N or the timestamp of source, N-1 road audio frequency write in this road audio frequency, this audio pack will have N or N-1 timestamp, and the pairing source of these timestamps audio frequency.For example M0 will comprise (U1, A1) (U2, A2) ... (UN, AN), M1 will comprise (U2, A2) (U3, A3) ... (UN, AN).
After generating this N+1 road audio frequency, M0 is sent to the user that all do not send audio frequency, M1 sends to U1, and M2 sends to U2, and by that analogy, the audio content that sends to each user does not comprise this user's audio frequency, promptly avoids echogenicity in these user's loudspeaker.
Step (3). after each client receives audio mixing compressed package and video compression bag,,, show the frame of video in the corresponding video compression bag then according to the principle of audio driven video with played in order behind the audio mixing compressed package decompress(ion).
The content that each client receives is the N road video compression bag of one road audio mixing compressed package and server forwards; Carry out through the audio driven video during broadcast, audio compression bag of promptly every broadcast, write down all timestamps of comprising in this audio compression bag (U, A) When playing X user's video, take out the corresponding video time stamp of this road video frame to be play (UX, VX); (UX AX), compares VX and AX the same user's of the audio frame that taking-up was simultaneously play recently timestamp; If VX is more than or equal to AX, represent that then video content after audio content, can play; And if VX less than AX; According to audio driven video principle, represent that this frame of video does not also arrive the moment of playing, need therefore to wait for that broadcast judgement next time determines whether and can play.
Network Transmission uncertain more intense, main performance have following some: data packet disorder and the uncertainty that receives time-delay.When sending data through TCP, the data that different connections are sent may be different with the order of sending when receiving, and when sending data through UDP, the order that different packets arrives also is unwarrantable, and this is the out of order characteristic of packet.No matter use TCP or UDP; The time that the packet arrival the other side computer that sends is consumed all is uncertain; Can change along with the Network Transmission quality condition, generally possibly in 1 millisecond to 500 milliseconds, fluctuate, in the time of the network difference even might reach the several seconds.Because above two characteristics, need sort respectively to the audio, video data that receives and cushion processing.The foundation of ordering is the sequence number in the packet, and the time of buffering will determine according to network delay.Network delay is more little, and the expression network condition is good more, can suitably reduce the voice data of buffering so, obtains better real-time property.Network delay is big more; The expression network condition is poor more, and we will suspend broadcast so, equals the duration of network delay up to the voice data duration of buffering; Though sacrificed real-time like this; But improved the fluency of playing, reduced when playing because buffering is too short, data are not had the data can be with the phenomenon of a card that causes after playing.
Claims (1)
1. handle the method for audio-visual synchronization when a multichannel audio-video frequency is play simultaneously, it is characterized in that the concrete steps of this method are:
Step (1). each user obtains audio, video data separately respectively and Voice & Video is compressed separately; Is that unit is divided into audio data unit with the voice data of gathering with 10～120 milliseconds, and each audio data unit is compressed into the audio compression bag, each audio compression bag mark collection client machine timestamp constantly; Each frame in the video data is compressed into the video compression bag, each video compression bag mark collection client machine timestamp constantly; Each audio compression bag and each video compression bag are sent to server;
The method that each user obtains audio, video data separately respectively comprises through the equipment collection and from media file, obtains; As passing through the equipment collection, the moment of then described timestamp for gathering; As from media file, obtaining, playback of media files or decompress(ion) assembly can be provided with timestamp for data, and this timestamp is the moment that relative media file begins, and converting into current computer is the timestamp of standard constantly;
Step (2). audio mixing behind each user's that server will receive the audio compression bag decompress(ion), the audio compression bag time corresponding of all participation audio mixings of record is stabbed in the audio mixing result then, is compressed into the audio mixing compressed package, sends to client; The video compression bag directly sends to client;
N user U1, U2 ..., UN, each user has one road audio frequency, total N road audio frequency, be respectively A1, A2 ..., AN; Server needs audio mixing to go out N+1 road audio frequency, is respectively:
The 0 the tunnel. comprised all audio frequency, be designated as M0,
The 1 the tunnel. other all audio frequency except that A1, be designated as M1,
The 2 the tunnel. other all audio frequency except that A2, be designated as M2,
……
The N road. other all audio frequency except that AN are designated as MN;
The every road audio frequency that generates all need it is corresponding N or the timestamp of source, N-1 road audio frequency write in this road audio frequency, this audio pack will have N or N-1 timestamp, and the pairing source of these timestamps audio frequency;
After generating this N+1 road audio frequency, M0 is sent to the user that all do not send audio frequency, M1 sends to U1, and M2 sends to U2, and by that analogy, the audio content that sends to each user does not comprise this user's audio frequency;
Step (3). after each client receives audio mixing compressed package and video compression bag,,, show the frame of video in the corresponding video compression bag then according to the principle of audio driven video with played in order behind the audio mixing compressed package decompress(ion);
The content that each client receives is the N road video compression bag of one road audio mixing compressed package and server forwards; Carry out through the audio driven video during broadcast, audio compression bag of promptly every broadcast, write down all timestamps of comprising in this audio compression bag (U, A); When playing X user's video, take out the corresponding video time stamp of this road video frame to be play (UX, VX); (UX AX), compares VX and AX the same user's of the audio frame that taking-up was simultaneously play recently timestamp; If VX is more than or equal to AX, represent that then video content after audio content, can play; And if VX less than AX; According to audio driven video principle, represent that this frame of video does not also arrive the moment of playing, wait for that broadcast judgement next time determines whether and can play.
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| CN103702013A (en) * | 2013-11-28 | 2014-04-02 | 北京航空航天大学 | Frame synchronization method for multiple channels of real-time videos |
| CN105187883A (en) * | 2015-09-11 | 2015-12-23 | 广东威创视讯科技股份有限公司 | Data processing method and client equipment |
| CN105516090A (en) * | 2015-11-27 | 2016-04-20 | 刘军 | Media play method, device and music teaching system |
| CN103428535B (en) * | 2013-08-02 | 2016-11-30 | 汎惪股份有限公司 | Real-time audio-video transmits and transmits and synchronous broadcast method, system and transmitting element thereof |
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| CN103702013A (en) * | 2013-11-28 | 2014-04-02 | 北京航空航天大学 | Frame synchronization method for multiple channels of real-time videos |
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| CN105187883A (en) * | 2015-09-11 | 2015-12-23 | 广东威创视讯科技股份有限公司 | Data processing method and client equipment |
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| CP03 | Change of name, title or address |
Address after: Xihu District Hangzhou City, Zhejiang Province, 310013 West Road Wensan No. 118 Hangzhou electronic commerce building room 1406 Patentee after: ZHEJIANG WANPENG EDUCATION SCIENCE AND TECHNOLOGY STOCK CO.,LTD. Address before: The electronic commerce building, No. 118 Hangzhou West Road, Zhejiang province 310013 city 15 Floor Patentee before: ZHEJIANG WANPENG NETWORK TECHNOLOGY Co.,Ltd. |
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| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 310051 12 / F, building 8, No. 19, Jugong Road, Xixing street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: ZHEJIANG WANPENG EDUCATION SCIENCE AND TECHNOLOGY STOCK Co.,Ltd. Address before: Xihu District Hangzhou City, Zhejiang Province, 310013 West Road Wensan No. 118 Hangzhou electronic commerce building room 1406 Patentee before: ZHEJIANG WANPENG EDUCATION SCIENCE AND TECHNOLOGY STOCK Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 12 / F, building 8, No. 19, Jugong Road, Xixing street, Binjiang District, Hangzhou City, Zhejiang Province, 310051 Patentee after: Zhejiang Wanpeng Digital Intelligence Technology Co.,Ltd. Address before: 12 / F, building 8, No. 19, Jugong Road, Xixing street, Binjiang District, Hangzhou City, Zhejiang Province, 310051 Patentee before: ZHEJIANG WANPENG EDUCATION SCIENCE AND TECHNOLOGY STOCK CO.,LTD. |