[SUSPECT ATTACHMENT] Re: [Ffmpeg-devel] Re: Problems encoding H264 with a MP4 / MOV container with ffmpeg

Bill May wmay
Thu Jun 16 20:03:25 CEST 2005

admin wrote:
> Hello,
> Thank you for your reply. Your implementation seem to be the correct one.
> ffmpeg's movenc.c one seem to have a problem, perhaps it doesn't create 
> the "avcC" data which leads to unplayability with Quicktime 7. I'm not a 
> specialist of MP4 muxing however.
> I send you in attachments a file encoded with ffmpeg and one muxed with 
> mp4v2, perhaps you could compare and if you see anything wrong in the 
> ffmpeg stream, you could post some hints to the ffmpeg-devel list? Erik 
> Slagter or someone else could then use your info to fix the code.

Yes.  It does not create the avcC atom required.  This is 14496-15, section, AVCDecoderConfigurationRecord.  It's basically got the 1st 3
bytes of the seq paramaeter set, then all the sequence and parameter

For Quicktime, the seq and parameter sets should not be in the bitstream,
but only in the avcC.

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