On Sun, 18 Jun 2017 13:32:42 +0000
Eran Kornblau <eran.kornb...@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.
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