[FFmpeg-devel] [RFC][PATCH] ticks_per_frame / timebase

Michael Niedermayer michaelni
Thu Feb 26 16:55:38 CET 2009

On Thu, Feb 26, 2009 at 04:40:51PM +0100, Reimar D?ffinger wrote:
> On Thu, Feb 26, 2009 at 03:15:09PM +0100, Michael Niedermayer wrote:
> > Attached is a patch that adds ticks_per_frame, which is a convertion factor
> > between the timebase and the "framerate" as stored in the header.
> > the patch also adapts several uses of timebase that where using it in the
> > meaning of the framerate
> > this patch is based on the one from ivan
> > 
> > i will commit this in a few hours if i receive no objections or better
> > suggestions. (short delay because of the release ...)
> I think you missed at least one place (though that might be broken as it
> is anyways), the problem is libx264.c:
>     x4->params.i_fps_num = avctx->time_base.den;
>     x4->params.i_fps_den = avctx->time_base.num;
> The problem here is that obviously libx264 uses this for its rate
> control - which means after this change bitrate will be regularly off by a
> factor of 2 for H.264->H.264 encodings.

do you think that there will be a problem after this change or have you
actually reproduced one created by this patch or the recent changes to
if you have a actual reproduceable test case iam interrested in the details
of it


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I do not agree with what you have to say, but I'll defend to the death your
right to say it. -- Voltaire
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