[FFmpeg-devel] How to synchronize device sources

[Nicolas George]

Noah Bergbauer (12020-01-26):
> I am currently working on a patch that implements DXGI desktop
> capturing and WASAPI audio capturing for Windows.
> 
> For this, I implemented two new devices in libavdevice.
> 
> The basics work, but now I'm not sure how to synchronize the audio
> stream with the video stream. Specifically, the two devices
> obviously maintain independent pts, starting from the point in time
> when they were first read from. So while in most cases there
> is no human-noticeable offset, this does occasionally - with some bad
> luck - produce a rather large error.
> 
> So is there anything I'm missing here? How can I make sure the two
> streams sync up (other than hardcoding some kind of communication
> between them)?

Devices that do live capture should, at least as an option, use the
absolute clock as pts. With that information, syncing becomes easy.

Regards,

-- 
  Nicolas George
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