[MPlayer-users] x264 and loss of sync with B-frames

Rich Felker dalias at aerifal.cx
Mon May 16 09:50:21 CEST 2005

On Mon, May 16, 2005 at 12:56:14AM -0400, Jason Tackaberry wrote:
> On Mon, 2005-05-16 at 00:53 -0400, Rich Felker wrote:
> > I think it's a bug, and one that's fairly hard t oovercome without
> > ugly hacks or large architectural changes. My advice is and always has
> > been: do not use B frames. They're nasty and cause all sorts of
> > problems, and do not significantly improve compression.
> But is that the case with H264?  At least, according to the
> documentation at
> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-x264.html:
>         The usefulness of B-frames is questionable in most other codecs
>         you may be used to. In H.264, this has changed: there are new
>         techniques and block types that are possible in B-frames.
>         Usually, even a naive B-frame choice algorithm can have a
>         significant PSNR benefit.
> Are the ugly hacks you speak of required with mplayer, or in the x264
> code?

in mencoder. a/v sync has absolutely nothing to do with codec.


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