Chain Desk

Given the source frame, work out what an ffmpeg filter chain actually does to the picture: whether it runs at all, the rectangle of the original that survives and where it sat, the smallest rectangle anywhere in the chain and the share of the output invented above it, the stretch between the two axes, and which adjacent swaps change the result or make it illegal. Derived from the ffmpeg-video-editor skill by @sundial-org (awesome-openclaw-skills), which generates these chains from natural language; credited in the app footer.

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