[FFmpeg-devel] [PATCH] movenc: support GPMF track (gpmd) remuxing
u at pkh.me
Fri Jul 21 17:09:29 EEST 2017
On Fri, Jul 21, 2017 at 03:03:19PM +0100, Derek Buitenhuis wrote:
> On 7/21/2017 2:55 PM, Clément Bœsch wrote:
> > It's basically the same layout for every stsd sample description. Check
> > the other tags that extend that layout, the also have that data ref idx to
> > 1. I think I copied from the rtp code, but it's the same for the other as
> > well. This gpmd atom just extends the stsd sample description with a
> > reserved 32-bit value.
> How very useful.
Well, I didn't write the ISO specifications.
If you're refering to the reserved 32-bit value, I suppose it's meant to
allow extensions in the future. Typically it could be reused as a version
or version+flags, which would define more fields, who knows. It's probable
the presence of that field is necessary for some players, so it had to be
present in the first place.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 488 bytes
Desc: not available
More information about the ffmpeg-devel