[FFmpeg-devel] [PATCH] lavf/isom: add "dvhe" fourCC for HEVC

[Jan Ekström]

On Tue, Nov 6, 2018 at 11:56 PM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>
> Since the patch doesn't change default muxing behaviour, it could
> be committed for the time being, please mention ticket #7347.
> Maybe print a warning if not reading the additional information
> can be an issue.
>
> Carl Eugen

I will post a v2 in a moment which contains all of the AVC and HEVC
identifiers specified in that Dolby specification and which are
registered at the MPEG-4 registration authority (they have two AVC and
two HEVC ones).

After looking at the relevant specs:
* These custom registered identifiers should only be utilized when the
stream cannot be played as-is by a standards-compliant AVC/HEVC
player. In other words, no color metadata is (supposed) to be left in
the video stream, and a custom DOVIConfigurationBox is required to be
parsed in order for the application to be able to interpret the actual
contents of the stream (YCbCr vs ICtCp('ish), HDR or SDR, base layer
or enhancement layer etc).
* These sample entries all contain the standardized configuration box,
which means that they should always be decode'able. Thus I am for
adding these identifiers to the demuxer, even if the actual content
cannot be interpreted without additional parsing.

Jan