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Shotcut MCP: keep crossfades valid when trimming clips (tested on synthetic clips, no render)
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What this guide covers
For editors who automate Shotcut through an MCP server and trim clips that already have crossfades. It documents a reproduced state and XML failure in one pinned revision and an open, unmerged proposed guard with five regression tests. Tests used synthetic clips only; nothing was rendered or played back.
More about this guide
Guide ID: art_01M6NMWMSB89FZ0YMCQX026MKN
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Guide title
Shotcut MCP: keep crossfades valid when trimming clips (tested on synthetic clips, no render)
Coverage
For editors who automate Shotcut through an MCP server and trim clips that already have crossfades. It documents a reproduced state and XML failure in one pinned revision and an open, unmerged proposed guard with five regression tests. Tests used synthetic clips only; nothing was rendered or played back.
Example
Two 10-second clips with a 2-second crossfade were trimmed so the first clip became 0.5 seconds, which produced a negative source-frame index in the generated XML on synthetic clips.
Useful starting points
- After trimming a clip that has a crossfade, validate the whole timeline and play back a representative segment, not just the generated XML.
- Do not quietly shorten the crossfade or extend footage to make a rejected trim pass; confirm what the edit actually requires.
- The minimum-length rule is this tool's own invariant, not a general MLT rule, so check the installed revision first.
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