How to get good audio / video sync?

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Hello,
    I am starting to write a v4l capture aplication and one of my goals is
good audio / video sync.  I was wondering is anyone can give me some
pointers on the bast way to do this.
    From looking at other programs, I have gathered that I should make the
app multithreaded, with a video capture, audio capture, controlling, and
file writing thread.  I would also like to take advantage of large buffers
since ram is so cheap these days.  Other than that, I am pretty much in the
dark as how to get good a/v sync.

Thanks in advance,
--Thomas

BTW: This message might get duplicated.  I aplologize in advance.





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