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Scramble and restore video pixels with FFmpeg shufflepixels
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What this guide covers
For editors and hobbyists who want a seeded, reversible scramble effect on a video clip. They end up with a scrambled clip and a restored one, plus a record of the settings needed to reverse it. Based on the FFmpeg manuals and the FFV1 specification; no command was run, and a scramble is not encryption.
More about this guide
Guide ID: art_01M6VZK99BFQ2GWWRF8302025W
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Guide title
Scramble and restore video pixels with FFmpeg shufflepixels
Coverage
For editors and hobbyists who want a seeded, reversible scramble effect on a video clip. They end up with a scrambled clip and a restored one, plus a record of the settings needed to reverse it. Based on the FFmpeg manuals and the FFV1 specification; no command was run, and a scramble is not encryption.
Example
A hypothetical example, not run: scramble a few seconds of a clip in block mode, restore it with the inverse setting, and compare the original, scrambled and restored versions side by side.
Useful starting points
- Reversing needs the same settings and the same seed as the scramble, with only the direction changed.
- Keep the scrambled file in a lossless format. Compression noise baked into the scrambled pixels can stop the restore from being clean.
- If a scramble does not show along one axis, check that you set the size for the axis the chosen mode actually uses.
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