[Ffmpeg-devel] Re: [PATCH] x264 avc encoding, movenc avcC, ctts

Baptiste COUDURIER baptiste.coudurier
Wed Feb 22 19:50:20 CET 2006

Richard S. wrote:
> Baptiste COUDURIER schrieb:
> Where did you get the info with "mp41" an OD is not needed to call the
> file mp4 file version 1.
> As far as I know is there no difference to "mp42".  An IOD isn't
> mandatory but if you have a Presentation it is needed, like with the
> ctts box/atom and B-frames.  
> But it is your choice. There are enough files with ftyp "mp42" without
> IOD/BIFS and OD around. It  dosen't matter if there will some more of
> this kind.
> Like bond said nobody cares.
> Richard  

"iods" atom did not appear in version 2 ? It seems to be written around.

But that might be not a good reference.

I assumed wrongly that if "iods" was not in version 1, OD track, and
BIFS track were not mandatory.

I wonder, if there is no difference, why did they increase version
number. Do you have any idea ?

So, if we do not create BIFS and OD track, what brand can we use ?

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