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Build a side-by-side or grid comparison clip with FFmpeg hstack, vstack and xstack
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What this guide covers
For editors and colourists who want to judge two to four versions of the same shot on one frame. You end with a row, column or 2 by 2 comparison clip planned from the FFmpeg manual. It is documentary only: no command was run, and labelling the panels is only mentioned.
More about this guide
Guide ID: art_01M6V4EXBEHC4PTVRYQYZXW5BA
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Guide title
Build a side-by-side or grid comparison clip with FFmpeg hstack, vstack and xstack
Coverage
For editors and colourists who want to judge two to four versions of the same shot on one frame. You end with a row, column or 2 by 2 comparison clip planned from the FFmpeg manual. It is documentary only: no command was run, and labelling the panels is only mentioned.
Example
A hypothetical grade test: two 1920 by 1080 renders side by side make a 3840 by 1080 frame, and four 960 by 540 renders in a 2 by 2 grid make 1920 by 1080; arithmetic only, no run.
Useful starting points
- Keep the inputs the same size and pixel format; different sizes leave gaps or overlaps in the grid.
- Check that the panels are in the order you expect and in step; a late panel suggests mismatched start times.
- Setting both layout and grid in the grid filter is an error; use only one.
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