[FFmpeg-user] Per frame metadata example?

Paul B Mahol onemda at gmail.com
Sat Jul 13 21:20:57 EEST 2019

On 7/13/19, Francesco Pretto <ceztko at gmail.com> wrote:
> Hello,
> I'm investigating on possibility to encode per frame metadata using
> ffmpeg API. Naive attempts to set a dictionary on "AVFrame.metadata"
> with some key values failed without any warning or error during
> encoding, but no values are retrieved on the field during decoding.
> I'm using ffmpeg 4.1.3 with modern send/receive API usage. Other users
> on SO seemed to try similar approach without success[1][2]. I've no
> specific requirements on container format: any format supporting this
> feature plus streaming would be good. I first tried with flv, mp4
> formats and ended up testing nut format noticing some trace of
> specific support for the feature[3]. Is there any obvious mistake I'm
> possibly doing? Is the feature actually supported?

What gives you reason this is supported? None of containers mentioned can
support it even theoretically.

> Regards,
> Francesco
> [1]
> https://stackoverflow.com/questions/51415447/ffmpeg-sidedata-or-metadata-per-frame
> [2]
> https://stackoverflow.com/questions/39330048/ffmpeg-per-frame-metadata-with-rtsp-and-h264
> [3] https://ffmpeg.org/pipermail/ffmpeg-devel/2013-March/141270.html
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