[Ffmpeg-devel] Re: mov writer appends... (qt-faststart doesn't work on MP4/3GP)

[Patrick Roberts]

--- Stephane van Hardeveld <s.vanhardeveld at chello.nl>
wrote:

> Pat,
> 
> I might be able to obtain a draft version from 2002,
> don't know if it 
> will work for you?
> 
> S.

  I'd love to take a look at it.  I can't imagine the
difference would be that great.

Thanks!
Pat



> 
> Patrick Roberts wrote:
> > Hi IIya-
> > 
> > 
> >>...the MOV encoder in ffmpeg places the headers
> > 
> > necessary for seeking
> > 
> >>and video information at the end of the file
> rather
> > 
> > than at the
> > 
> >>beginning...
> > 
> > 
> >   I'm working on a solution for this currently.  I
> > have something I think will work for 2-pass
> encoding,
> > but not yet elegantly for single pass.
> > 
> >   The qt-faststart mentioned doesn't work for MP4
> or
> > 3GP files.  Mp4creator's -optimize flag ends up
> > ripping out atoms that it doesn't think are
> necessary,
> > and sometimes breaks playback for some devices.
> > 
> >   I'm also working to add support for adding
> MP4/3GP
> > hint tracks (required for many streaming servers).
> 
> > Also on adding the avcC atom, which I'm not sure
> how
> > avc1/h264 support inside MP4/3GP containers got
> > included in ffmpeg, since MP4/3GP avc1 isn't
> supposed
> > to work without a avcC block.
> > 
> >   One piece of info I'm missing is the rest of the
> MP4
> > AVC standard, specifically ISO/IEC 14496-10.  If
> > anyone knows were to find similar information
> (other
> > than source code) without paying the $200 the IEC
> > wants, please let me know.
> > 
> > -Pat
> > 
> > 
> > --- Ilya Konstantinov <future at shiny.co.il> wrote:
> > 
> > 
> >>Hi,
> >>
> >>Unlike Apple's QuickTime, Nokia's 3GP encoder
> etc.,
> >>the MOV encoder in
> >>ffmpeg places the headers necessary for seeking
> and
> >>video information at
> >>the end of the file rather than at the beginning,
> >>that way making the
> >>produced files less suitable for streaming. Also,
> I
> >>suspect that this
> >>fact causes 3gp files produced with ffmpeg not to
> >>play on my Nokia 6230i
> >>phone. I'm not sure of the later conclusion, but
> >>when comparing files
> >>produced by Nokia or QuickTime with ffmpeg's
> files,
> >>ffmpeg's difference
> >>seems to be in the header ordering.
> >>
> >>_______________________________________________
> >>ffmpeg-devel mailing list
> >>ffmpeg-devel at mplayerhq.hu
> >>http://mplayerhq.hu/mailman/listinfo/ffmpeg-devel
> >>
> > 
> > 
> > 
> > 
> > 		
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> 
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