Python access to AVFrame metadata

[shenberg]

Lack of this makes some filters useless - e.g. silencedetect which adds a 'silence_start' and/or 'silence_end' key to the frame's metadata when detected - see source

[shersonb]

I would also be interested in this, as I would like access to lavfi.scene_score and data from the blackdetect filter. I currently have to run a ffprobe subprocess to do this.

[github-actions]

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