On 12/10/2016 14:50, Francois Cartegnie wrote:
> Because not every side data is handled or extracted
> internally by libav, a libavcodec user might need
> to attach some extradata and retrieve it in
> presentation order after decoding.
> 
> Ex: active format data,
>     unhandled closed captions format
> ---
>  libavcodec/avcodec.h      | 7 +++++++
>  libavcodec/utils.c        | 1 +
>  libavfilter/vf_showinfo.c | 3 +++
>  libavformat/dump.c        | 3 +++
>  libavutil/frame.h         | 8 ++++++++
>  5 files changed, 22 insertions(+)
> 

Sounds a good idea for a number of usages indeed.

Probably we could extend the format for custom SEI embedded data, but
that could be a separate side data in itself.

lu


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