[FFmpeg-devel] [libav-devel] ff_thread_get_format and metadata

Hendrik Leppkes h.leppkes at gmail.com
Thu Apr 6 12:08:24 EEST 2017

On Thu, Apr 6, 2017 at 11:01 AM, Steve Lhomme <robux4 at gmail.com> wrote:
> Hi,
> As I am progressing in proper HDR10 support in VLC, I am facing an
> issue. The mastering (and lighting pending patch) metadata are set on
> the AVFrame but not available to the ff_get_format() receiver.
> That means when we configure our vout and decoder we don't know if
> it's going to have HDR metadata or not.
> Could we move the mastering (and lighting) metadata on the
> AVCodecContext ? Or provide the metadata on the ff_get_format() call ?
> I CC'ed libav as they have opinions on possible API changes, even
> though there is no mastering metadata support in there yet.

I'm against polluting AVCodecContext with more random fields, and
get_format is fixed API/ABI, we can't change that very easily.

In general, this is per-frame metadata, which can appear or change
with any given frame, without get_format being invoked again. You
should probably just be able to have your output react to that once it
receives it.

- Hendrik

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