[calvin-archastro]

Camera takes crashed, and stills of new takes left layers out. Found while testing the camera after #10. This PR also adds the next Record features: mirroring and voice clean-up.

Fixes

• Cameras with fixed frame rates (C920). The camera offers 30.00003 fps and refuses a frame duration of exactly 1/30, so the recorder crashed as soon as a camera was chosen. It now uses the camera's own duration for that rate.
• Layers missing from stills. ctl frame and the viewer's still dropped any video frame lasting under half a frame. Every take starts with a held frame a few milliseconds before the first real one, so the camera (and sometimes the screen) disappeared for the first second.
  • The still filter now passes the last frame (fps=…:eof_action=pass). This also helps variable-rate footage from phones.
  • The recorder no longer writes a frame within 10 ms of the previous one.
• Square bubble in the live preview. gpui clips to rectangles, so the round bubble showed as a square. Camera preview frames now arrive cut to the part the scene shows, and are drawn round themselves.
• record setup restarts stopped sources. Before, it only restarted them when the setup had changed.

Mirror

• Any picture. Look.mirror flips a picture left to right, before its crop, mask and hidden box. The viewer and export share the same filters, so both use one hflip. It's in the inspector under "Crop and mirror", and in ctl as look --mirror.
• The camera in Record. A Mirror switch in the scene bar (record setup --mirror) flips the live preview and brings each take's camera clip in mirrored. camera.mp4 itself is never flipped.
• Old projects unchanged. Unflipped looks save as before (mirror is left out).

Voice clean-up (like OBS's mic filters)

• What it does. Clip.clean runs three steps:
  • It cuts rumble below 80 Hz.
  • It lowers steady noise (afftdn). Its noise floor rises with the strength setting, and that floor mattered more than the reduction amount.
  • Optionally, it evens out the level (dynaudnorm). In tests this lifted a quiet voice from −32 to −23 dB and held a loud one back slightly, while noise in pauses stayed below the original. A compressor with make-up gain raised the room noise instead, so it was dropped.
• Measured on the C920's own room noise: at the default strength the noise drops about 5 dB, with the voice nearly unchanged. It runs about 25× faster than anlmdn for the same result, and doesn't shift timing.
• Export and playback match. One filter list serves both: the viewer decodes a cleaned clip's sound in the background, as it already did for retimed clips.
• Where to find it.
  • Inspector: Sound › "Clean up the voice", with a Noise slider and "Even out the level".
  • ctl: clean --clip C [--noise F] [--even/--no-even] | --off.
  • Record: a switch under the mic (record setup --clean), so each take's mic clip comes in cleaned. microphone.m4a stays as recorded.

Tested by hand:

• C920 plus mic plus screen plus system sound: each take writes all four files, and the bubble and side-by-side layouts render as expected in ctl frame.
• A mirrored take's camera clip comes in flipped.
• A take with clean-up on brings its mic clip in cleaned, and the export applies the filters.
• Screenshots of the Record tab show the round bubble and the new switches.

fmt, clippy, doc and tests pass, with new tests for: the mirror filter order, the studio's mirror in every layout, the clean-up filters and their place in the export chain, cutting preview frames, and the new ctl flags.

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