[MEncoder-users] How to detect B frames

[Lennart Börjeson]

torsdag 07 juni 2007 09:55 skrev Levente Novák:
> On Thu, 2007-06-07 at 00:30 -0700, RC wrote:
> > On Thu, 07 Jun 2007 09:21:32 +0200
> >
> > Levente Novák <lnovak at dragon.unideb.hu> wrote:
> > > > It doesn't matter, at all, whether the SOURCE video has b-frames or
> > > > not.
> > > >
> > > > Your problem is elsewhere.
> > >
> > > Except of course if he is going to use the lavf muxer in which case it
> > > _does_ matter a lot (i_certify_that...).
> >
> > Still no.  Not at all.
>
> Can you elaborate on this? You must have a source devoid of B-frames,
> otherwise you can not use the lavf muxer (it's well in the docs, even
> MEncoder spits it out at encoding time).
>

The OUTPUT of mencoder, as read by the lavf muxer, must not have B-frames. The 
INPUT to mencoder, i.e. the SOURCE videos, may have B-frames. You must only 
make sure the transcoding process (i.e. the relevant encoding options) does 
not produce B-frames.

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