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. -- Clément B.
signature.asc
Description: PGP signature
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
