Windows beta testing

The first unattended Windows campaign creates a project through the native folder picker, accepts Chrome’s scoped folder permission, imports two clips, drags and trims timeline clips, edits a rectangle mask, verifies undo/redo, and exports using WebCodecs Fast. Run npm run test:e2e:beta on an unlocked Windows desktop with installed Chrome, FFmpeg and the reference-media pack.

The campaign waits for project, import, clip and waveform readiness. Preview checks require stable pixels and compare the source against an independent decode. Generated fixtures encode an exact frame counter and separate audio tones. Export checks validate the browser’s suggested filename, MP4/H.264/AAC format, dimensions, duration, audio, all 90 video frames and their presentation timestamps. Playback of the exported file checks completion, dropped frames and rebuffering in Chrome.

The test exposed a FAST export bug that returned a neighboring buffered frame before the requested source frame was ready. Export now waits for the exact sample and fails if it remains unavailable. It also exposed a preview startup race where Chrome reported loaded media before the first playing frame had a GPU resource; live texture import now waits for that first frame.

Tests use a dedicated Chrome profile and short project workspace. Teardown closes only that profile’s Chrome processes and removes its temporary project/media files, including after failures. Evidence remains under the ignored output/windows-beta directory. Cleanup rejects unrelated paths and filesystem reparse points.

Campaign run-28 passed eight checks in 1.8 minutes on Windows/RTX hardware. Both real-footage and generated exports presented 90 frames with zero dropped frames and zero rebuffer events. This covers three-second 640x360, 30 fps fixtures, not all codecs, resolutions, durations, features or devices. Media import uses a browser file input; only project-directory selection currently exercises the native picker. Whole-machine termination still requires a future external cleanup supervisor.

Implementation and evidence details: harness README.