[FFmpeg-devel] [PATCH] movenc: support GPMF track (gpmd) remuxing
u at pkh.me
Fri Jul 21 17:11:04 EEST 2017
On Fri, Jul 21, 2017 at 04:09:29PM +0200, Clément Bœsch wrote:
> 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
that atom (as in, the sample description)
> present in the first place.
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