[Ffmpeg-devel] Re: lavc mpeg4 with b frames in mov/mp4

[bond]

> Michael Niedermayer wrote:
> > Hi
> >
> > On Fri, May 19, 2006 at 10:44:37AM +0200, Baptiste Coudurier wrote:
> >> Hi
> >>
> >> While testing lavc mpeg4 in mov/mp4, I noticed that quicktime player
> >> does not play a stream with B frames;
> >
> > elaorate please, what happens?
>
> Blank screen, as usual when quicktime player cannot decode the stream.
>
> >
> >> ctts is correct though. Weird
> >> thing is that xvid streams are correctly played.
> >
> > xvid encoded with ffmpeg -vcodec xvid?
> >
> > [...]
> >
>
> Yes. 'ctts' is wrong with xvid since pts are not correctly computed but
> still the picture is decoded.

till now quicktime didnt handle mpeg-4 asp (and therefore no b-frames), it
only handles simple profile

are you sure that in the xvid sample it really decodes also the b-frames (or
simply skips them)?