[FFmpeg-devel] [RFC] lavfi: metadata injection
stefasab at gmail.com
Thu Oct 11 11:27:38 CEST 2012
On date Wednesday 2012-10-10 00:55:09 +0200, Clément Bœsch encoded:
> So here is an attempt to introduce some communication between filters, and
> allow the users to exploit the results of analysis filters.
> [PATCH 1/4] lavfi: add metadata to buffer ref.
> This patch is based on https://github.com/kuehnelth/libav/commit/b8e9baf7
> I added more dict copy & stuff. Hopefully it is correct, but the code is a
> bit convoluted so I'm still unsure if I'm missing or no a corner case.
> [PATCH 2/4] lavd: make lavfi device export the metadata up to the
> This one is a proposition of raising information from a lavfi input device up
> to AVFrame. It abuses the priv field, but it looks like the simpler way to
> me. I had a solution making use of side_data, but it was really too much
> code. priv seems mostly unused, and we can move to some other system if
> necessary in the future.
> [PATCH 3/4] lavfi/silencedetect: export silence info to metadata.
> First application of the feature. Still lacking documentation, but I'm
> waiting for more filters to use it. We should decide on the convention to
> follow for the prefix. I selected "lavfi", it can be discussed to whatever
> color you prefer.
> Example of usage:
> % ./ffprobe -v 0 -f lavfi -i amovie=silence.mp3,silencedetect -show_frames -of flat|grep lavfi_silence
end == start??
FFmpeg = Fundamentalist and Fantastic Magnificient Patchable EntanGlement
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