[program-sam]

Rescript can hand an edit to Resolve, Premiere, Final Cut, Pro Tools, Reaper and Samplitude, but not to Blender. This adds Blender to the Timeline export. It downloads a .blend (Blender 5.2+) that opens in the Video Editing workspace with every cut in place. It works in the browser as well as the desktop app.

How it works

• Clips link to the original media relative to the project (//<file name>), so save the .blend next to the source. Nothing is packed and no captions are added.
• The project is written in the browser by patching a small vendored scaffold (assets/blend/scaffold.blend; regenerate it with scripts/generate-blend-scaffold.py). This works the same way as the AAF export.
• The 25% proxy preview is on by default. Until proxies are built, Blender previews from the original file.

Matching the rendered export

• The timeline is laid out the way the MP4/WebM export renders it:
  • Each clip keeps exactly the frames ffmpeg's trim keeps.
  • Clips start where concat starts them, rounded to a whole frame.
  • Where a keep's audio outlasts its frames, the render holds the last frame, and a short hold strip does the same here.
• Blender cuts audio only on whole frames. So each sound strip starts exactly on the cut (via a sub-frame sound offset) and ends on the last frame boundary before the next cut. Deleted audio is never played; at most one frame of kept audio is lost at each cut-out.
• Blender plays a 30 fps file frame by frame in a 25 fps project, so the scene must use the source's own frame rate:
  • The rate is read from ffmpeg's stream info during the audio extraction that already runs, in both the wasm and the native path.
  • The frame-rate picker only appears for Blender when the rate can't be detected.

Testing

• npm run test:timeline adds tests/blend-test.ts, covering frame planning, file structure, names, 1,000-clip edits and audio-only projects. When Blender is installed, the test also loads the result in Blender.
• npm run test:ffmpeg now checks the detected frame rate.
• End to end, I rendered the downloaded .blend in Blender 5.2.1 and compared it with rescript's own MP4 export of the same edit:
  • Every frame matches at 25, 29.97, 30 and 60 fps, on synthetic sources and on real 1080p phone footage.
  • Audio stays within half a frame of the export, with no drift.
• Variable-frame-rate phone video is close but not frame-exact: Blender addresses movie frames by index, not by timestamp.

Created with Claude Opus 5.5 in Claude Code, reviewed by GPT-6.1-Sol.

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