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Vance Ingalls
43c88961b2
ffmpeg exits 0 and writes a structurally valid but EMPTY wav whenever a clip's trim starts past the end of its source — `-ss 10 -t 5` on a 2 s file. That track reached `new OfflineAudioContext(channels, 0, rate)`, which throws NotSupportedError, and the error travels past the mixer's per-track failure collector: one mis-set `data-media-start` on one clip with one enabled effect took the WHOLE render down with a RenderQualityError. An empty track has nothing to process, so applyAudioFxChain now hands the input back the way it already does for a chain with nothing enabled — before paying for a browser to decide it. The runtime stub guards the same case at the point the constructor would actually blow up, since it is reachable by any other caller of the injected script. The test falsifies against the real browser path: removing the guard reproduces `NotSupportedError: The number of frames provided (0) is less than the minimum bound (1)`.