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export

Design & creation

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Updated 10-16 03:42

About this skill

Export

Pireel exports render locally in the user's open studio tab (WebCodecs client compositing) and the file is saved straight to the user's machine via the browser's download — nothing is uploaded, there is no cloud render queue and no download URL. The flow is export_video to start, track_export to poll, then locate the downloaded file.

Flow

  1. Call export_video with the options the user asked for (all optional):
{ "resolution": 1080, "fps": 30, "format": "mp4" }

Resolution options: 2160 / 1440 / 1080 (default) / 720 / 540. FPS: 24 / 30 (default) / 60. Format: mp4 (default) / webm / mov.

  1. Rendering is roughly realtime — a 3-minute video takes about 3 minutes. Poll track_export every ~15s; it returns {status, progress} while running.

  1. When track_export returns status: "done" it includes filename — the browser has already saved that file. Locate it:

    • Default location is the user's Downloads folder: ~/Downloads on macOS/Linux, %USERPROFILE%\Downloads on Windows (unless the user configured a different browser download directory or the browser asks where to save).
    • Check for a fresh in-progress .crdownload/partial file matching the filename first; wait until it completes (suffix gone, size stable).
    • Chrome de-duplicates names itself (name (1).mp4) — prefer the freshest file matching the base name over an exact-name older file.
    • Confirm the absolute path to the user; show the video inline when the harness supports it.

  2. Unchanged content re-exports instantly (the tab caches the last render for the same composition + options).

Preconditions & fallbacks

  • The studio tab must be open and stay open until the export finishes. If tools report OFFLINE MODE, ask the user to open the project in the browser first.
  • If track_export reports an error, report it verbatim and suggest retrying once; repeated failures usually mean the source video File was lost after a page refresh — the user should re-open the project so it reconnects, then retry.
  • If the file cannot be found in Downloads after completion, the browser may be configured to ask for a save location — ask the user where they saved it instead of guessing.
  • Do not flatten or re-encode the timeline yourself with local ffmpeg as the primary deliverable — the studio render is the source of truth (framing, graphics, captions are composited there).