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Audio and video synchronization


In the developing process of broadcasting system I have encountered with the problem, which, probably, is faced by all developers of such systems it is audio and video synchronization.

I have built my system in such way, that one working program thread was transcoding video, and other thread - was transcoding audio. Then the results were multiplexing. As a result, when viewing by player, there was a considerable mistiming.

At first I tried to solve it, as it called, head-on. I noticed that mistiming on each channel was the same every time, so, I just added the appropriate delay in necessary execution thread of the program. And it worked perfectly the mistiming disappeared.

But my joy did not last for long. Everything worked exactly before the moment, until I worked with only one TV channel. As soon as I ran in parallel processing of several channels, everything was falling apart - the delay was floating and my method didnt work. And it is clear, adding the delay in necessary execution thread - it is like an attempt to slant the result, but not to solve the problem.

So the only working way is synchronization by PTS marks, derived from Mpeg-2 thread. And so did I, and it have solved the problem completely.

Igor, October 2012.



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