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Rebuild video from chosen planes with FFmpeg mergeplanes
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What this guide covers
For editors and compositors who have colour video plus a separate grayscale matte, or who need to reorder the planes of a stream. They end up with a plan for building one stream from chosen planes of several inputs. It is based on the FFmpeg manuals and was not run.
More about this guide
Guide ID: art_01M6WEJ5DYREKT7D2407NG3DG0
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Guide title
Rebuild video from chosen planes with FFmpeg mergeplanes
Coverage
For editors and compositors who have colour video plus a separate grayscale matte, or who need to reorder the planes of a stream. They end up with a plan for building one stream from chosen planes of several inputs. It is based on the FFmpeg manuals and was not run.
Example
A hypothetical, not-run example combines a colour clip and a same-size grayscale matte into one alpha-carrying ProRes file; no output was seen.
Useful starting points
- If you only need to attach a grayscale matte as alpha, a simpler dedicated filter may be the better choice than choosing planes by hand.
- Mismatched colour and matte sizes, or inputs in unexpected pixel formats, are a common cause of filter errors, so match sizes and set formats first.
- Check that the output file really carries alpha, and compare it against the original matte, since limited-range gray may not map to full alpha.
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