[Ffmpeg-devel] Possibly wrong tags assigned in movenc.c

[Nico Sabbi]

Michael Niedermayer wrote:

>Hi
>
>On Wednesday 11 May 2005 17:08, Nico Sabbi wrote:
>  
>
>>Hi,
>>according to IS-14496-1, when muxing to MP4 the tag assigned to H264 in the
>>
>>object_type field present in the DecoderConfigDescriptor is 0x21,
>>while ffmpeg assigns 241 (in ff_mov_obj_type).
>>
>>Additionally, stream_type should be 0x4 for video
>>and 0x5 for audio, instead movenc uses 0x11 and 0x15 respectively.
>>
>>Are the current values specific to quicktime?
>>    
>>
>
>i would guess they are probably just wrong, do they cause problems with any 
>players? do the IS-14496-1 values cause problems with any players? if later 
>is not worse then we should change them, cvs commit or patch welcome
>
>[...]
>  
>

I remember reading in this list that qt7 can't decode mp4 with h264 made 
by ffmpeg,
so I compared the codes used by ffmpeg with the ones in the specs.

It turns out that 0x11 and 0x15 were correct, so I added a comment to 
specify how
that byte (the streamtype) is coded. The value for the object type is 
really wrong, though.

At the moment I don't have a qt7 to test, if I find one I will report.
It would be nice if some Mac user made some test with my patched 
attached and without
to verify if it fixes qt7 playback.

    Nico

 
 
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