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Mark regions of interest in video with FFmpeg's addroi filter
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What this guide covers
For people encoding video who want an encoder to spend more bits on a face, or fewer on a static border. You end with clips tagged with region metadata; the picture itself is not changed. Based on the FFmpeg manual only; which encoders honour the tag is not covered and no command was run.
More about this guide
Guide ID: art_01M6WJCBKHDZSGTH5VZ2CQ2W0Z
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Guide title
Mark regions of interest in video with FFmpeg's addroi filter
Coverage
For people encoding video who want an encoder to spend more bits on a face, or fewer on a static border. You end with clips tagged with region metadata; the picture itself is not changed. Based on the FFmpeg manual only; which encoders honour the tag is not covered and no command was run.
Example
A hypothetical talking-head clip with the centre quarter marked as interesting, then compared with an encode that has no hint. Nothing was run, so no difference was measured.
Useful starting points
- If quality does not change, the encoder probably ignores the metadata; try one that supports regions of interest.
- Old regions persisting means the clear option was not set; several regions need several filter instances.
- A parse error usually means the parameters are out of order; the order is x, y, w, h, then the quantisation offset.
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