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

[Patrick Roberts]

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.
> 
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> 



		
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