[FFmpeg-devel] hev1 vs. hvc1

[wm4]

On Sun, 18 Jun 2017 13:32:42 +0000
Eran Kornblau <eran.kornblau at kaltura.com> wrote:

> Hi all,
> 
> We're trying to make ffmpeg output a format tag of 'hvc1' for HEVC, since it seems that only hvc1 works in iOS 11 beta.
> We saw that '-tag:v hvc1' does the trick, but it only works in 'mov' format, and not in 'mp4' format (we're using mp4
> format for all our videos)
> The reason is that ff_codec_movvideo_tags contains hvc1 while ff_mp4_obj_type does not.
> The question is - is this intentional? Would it make sense to submit a patch to add hvc1 to mp4?
> 
> Also, something that I don't understand - ff_codec_movvideo_tags has 4cc values for 'tag' while ff_mp4_obj_type
> has small integers values, so unless I'm missing something, any attempt to force a tag in mp4 format will fail.
> Can anyone explain why is that?

I think there are pending patches on libav-devel.