[FFmpeg-user] confusion with "-vsync 1" / "-vsync cfr" and "-map" (to sync audio to video)
Carl Eugen Hoyos
cehoyos at ag.or.at
Fri Jan 11 20:19:04 CET 2013
Tracey Jaquith <tracey <at> archive.org> writes:
> I am the developer of the TV Archive ( http://archive.org/tv )
> and have a question regarding A/V "sync" issues.
> We are finding that some of our "harder" channels are
> requiring "-vsync 0" or "-vsync 1". The problem with the
> former is that our resulting .mp4 get A/V slip when
> progressively downloaded through the flash plugin (only) but
> are fine for html5 browsers. So we want to go with "-vsync 1".
> I'd *like* to make the audio frames dropped/duped
I suspect this means that, instead of -vsync x,
you want to use -async 1 (which is now also
-af aresample=async iirc).
Generally, please do not post extracts of console but only
complete, uncut console output (at least the first 50 and
the last 50 lines).
(Did -vsync in your command line really make a difference?
Hard to believe...)
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