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Vance Ingalls
bfa27381e1
The internal AbortController exists so a fatal FX error can cancel in-flight
ffmpeg before the finally-block deletes workDir. It reached the entry guard and
applyAudioFxChain, and nothing else: the trim, the video extract and the
download were all still handed the CALLER's signal. So `internalController
.abort()` cancelled nothing, and the `rmSync(workDir, { recursive: true })`
immediately after it ran while those children were still writing into the
directory.
Concretely: track A's FX render fails while track B is mid-trim, with no
external cancellation. B's ffmpeg keeps writing `${id}-trimmed.wav` into an
unlinked directory until it finishes. The comment above the controller
describes a mechanism that was never wired to the processes it names.
The download also had no signal at all, though downloadToTemp accepts one.
No test: the three changes are which variable is passed to a child process
helper, and observing the difference means driving real ffmpeg to the point of
cancellation. The old wiring's inertness is provable by reading — the caller's
signal is never aborted by this function — and the new wiring is the same three
calls with the controller the function already built.