[MPlayer-dev-eng] [PATCH] -oac copy with ac3 sound and lavf ts demuxer issues (Was: Re: [MEncoder-users] Video/Audio asynchronous)

[Matthias Hopf]

On Feb 24, 07 19:11:26 +0100, Nico Sabbi wrote:
> Matthias Hopf wrote:
> 
> >>>I rechecked, and first stumbled over another issue: lavf thinks this
> >>>video is 1920x1080 at 59.96fps(!), while mpegts detects 29.976. I called
> >>>the lavf calls with -ofps 30000/1001 in order to ignore this for now.
> >>
> >>well if lavf says 60000/1001 then i would suspect that to be true
> >>telecined mpeg specifies frames based on such a timebase
> >
> >
> >I've never seen 60000/1001 for 1080i in my life (don't know if it's even
> >part of the standard), only for 720p. And the video does seem to be
> >30fps not 60, because with lavf mencoder creates a lot of duplicated
> >frames.
> >
> 
> maybe it has the progressive_sequence flag set, so every frame is 
> supposed to last 2x the framerate (plus the time related to the rff).
> I've already seen such beasts

Well, demux_ts detects 30000/1001, and when demuxed with lavf and *not*
specifying -ofps, you'll end up with a *lot* of duplicated frames.
So this could well be, if lavf doesn't support that flag yet.

Matthias

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