fix(compositor): say when a declared camera is unreadable - #357
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Both places that open the preview's webcam decoder fell back to opening the
screen recording a second time, silently, on any error:
let wdec = match Decoder::open(webcam_path, gpu) {
Ok(d) => d,
Err(_) => Decoder::open(screen_path, gpu)?,
};
That collapses two cases which deserve opposite treatment.
A clip with no camera arrives with an EMPTY path -- assetCameraSource returns ""
-- and the stand-in is harmless there: nothing draws it, because compositing
only places a webcam rect when the document declares a camera. Verified end to
end today: recording with the camera off and reopening the project shows no
stray picture-in-picture.
A NON-EMPTY path that fails to open is the other case entirely. The project
declares a camera whose file has moved or been deleted, the webcam rect IS
drawn, and what appears inside it is the screen recording. That is #265's
symptom, still reachable, and nothing in the logs distinguished it from the
harmless case.
The two sites now share one named function, and the bad case logs the path and
the underlying error. Behaviour is otherwise unchanged.
ponytail: keeps the stand-in rather than making wdec an Option<Decoder>, which
would touch 22 sites including the decoder pool and the unsafe compositing loop
-- a refactor of the preview engine, not a cleanup, for a cost nobody has
measured. The log is what would tell us whether the wasted decoder is worth that
work, and how often the reachable case actually fires.
Compile-verified in CI only: the compositor needs thirdparty/ffmpeg, which is
not present in a fresh checkout.
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Inline comments:
In `@crates/compositor/src/live.rs`:
- Around line 102-110: Update the decoder-selection logic around webcam_is_real
and Decoder::open so no-camera paths, including whitespace-only values and the
screen-path sentinel, are detected with the shared predicate before attempting
the webcam decoder. Preserve the existing fallback to Decoder::open(screen_path,
gpu) and emit the warning only when webcam_is_real indicates a real camera path
that fails.
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crates/compositor/src/live.rs
The previous commit tested `webcam_path.is_empty()`. This crate already answers that question, in `webcam_is_real`, and it covers two cases the shorter test misses: a whitespace-only path, and a caller that passes the screen's own path as the webcam path -- which `ExportDialog.tsx` does and older scenes still contain. So the warning would have fired on a project with no camera whenever the caller used the screen-path spelling, telling the reader their camera file is missing when there is no camera at all. Adding a third convention for "no camera" is also precisely what made this bug class hard to see in the first place. `webcam_is_real`'s own doc comment says it: missing the empty-string case is what put the screen recording inside the picture-in-picture box. Checking it first also skips a decoder open that was always going to fail on the no-camera path, and lets the warning drop its condition. Also unwraps the message from the backslash continuations, which collapsed into one line with a run of spaces in the middle.
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Both places that open the preview's webcam decoder fell back to opening the screen recording a second time, silently, on any error:
That collapses two cases which deserve opposite treatment.
The harmless one
A clip with no camera arrives with an empty path (
assetCameraSourcereturns""), and the stand-in costs only a wasted decoder: nothing draws it, because compositing places a webcam rect only when the document declares a camera.Verified end to end today on 1.9.0: record with the camera off, stop, reopen the project both warm and from a cold start. No stray picture-in-picture, no crash. I had flagged this as a likely cause of #348 yesterday and it is not one.
The one that matters
A non-empty path that fails to open means the project declares a camera whose file has moved or been deleted. The webcam rect is drawn, and what appears inside it is the screen recording. That is #265's symptom, still reachable, and nothing in the logs told it apart from the harmless case.
Both sites now share one named function, and the bad case logs the path and the underlying error. Behaviour is otherwise unchanged.
What this deliberately does not do
Make
wdecanOption<Decoder>. That is the structurally correct fix and it touches 22 sites, including the decoder pool and theunsafecompositing loop — a refactor of the preview engine rather than a cleanup, for a cost nobody has measured. Aponytail:comment records the ceiling and the upgrade path.The log is what would justify that work: it says how often the reachable case fires, and gives a way to count the wasted decoders before paying for removing them.
Testing
rustfmtclean on the lines changed (the file's pre-existing import order is left alone; CI does not enforce Rust formatting)thirdparty/ffmpeg, absent from a fresh checkoutRefs #265
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