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tylerjenningsw
baf62b22df
Cause: a preview with sound and video, without Cache Before Playback, held its sound while the playhead advanced silently through frames as they rendered, and started the sound at the frame it had reached once the frames ahead were cached or rendering had kept up for a quarter second. So the opening (about the first third of a second) was never heard, and those frames played silently. With Video off, or Cache Before Playback, the sound started at the first frame. Fix: starting such a preview now holds the playhead on its first frame while the frames ahead render (the prefetch window, at most what fits in the RAM preview: not the whole work area), then starts sound and picture together from that frame, the sound's clock driving the picture. Without an output device the picture plays from that frame on its own clock. A stall later on still stops the sound and catches up silently. Stop clears the startup state. Tests (ui_audio_scrub): the two startup tests no longer accept silent frames first: the playhead must hold frame 0 until the sound starts, and the sound must start at frame 0 (also for a 30 s work area, without caching it all). A tone lasting only the first 100 ms after a start at 0 s and at 1 s reaches the output device. Video off still starts at once; no device plays the picture; Stop while preparing leaves nothing playing. The three startup tests fail on the previous code (the playhead had moved on to frame 1, silently).