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fix(player): read yt-dlp PCM from a pipe cliamp owns - #561
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ffmpeg's PCM came through Cmd.StdoutPipe while monitorExit ran cmd.Wait during playback. Wait closes that pipe as soon as ffmpeg exits, so the end of every yt-dlp track dropped the PCM still buffered in the pipe and failed the next read with "file already closed" instead of EOF. The player took that for a dropped connection: the last track in the queue restarted from the beginning instead of ending the queue. Give ffmpeg an os.Pipe instead, as the yt-dlp to ffmpeg hop already does. Found and first fixed in #422.
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ChangesPCM output draining
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Suggested reviewers: Merge Risk: ⚪ Minimal · up to Buffered PCM remains readable after ffmpeg exits, so normal playback can finish the last track instead of cutting it short. No actionable current-head risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@player/ytdl_test.go`:
- Line 250: Reduce the payload in the pipe-buffer fixture around the frames
constant and yt-dlp script so it fits within the minimum pipe capacity and
remains buffered after the fixture process exits; keep the expected audio length
consistent with the smaller payload.
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player/ytdl.goplayer/ytdl_test.go
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Linux caps a new pipe at two pages once a user passes the pipe soft limit, where the 16 KiB fixture could block ffmpeg before it exits. 1 KiB still shows the dropped output on the old StdoutPipe code.
Summary
When the last YouTube track in the queue ends, cliamp shows
reconnecting in 1sand plays it again from the start instead of ending the queue.ffmpeg's PCM was read through
Cmd.StdoutPipewhilemonitorExitrunscmd.Waitduring playback.Waitcloses that pipe as soon as ffmpeg exits, so the PCM still in the pipe was dropped and the next read failed withread |0: file already closedinstead of EOF. The player took that for a dropped connection and reconnected. When the next track is already preloaded the gapless switch hides it, which is why it shows on the last track.ffmpeg now writes to an
os.Pipethat cliamp owns, as the yt-dlp → ffmpeg hop already does.The fix comes from #422, which bundles it with other yt-dlp changes; this is that one change on its own, and #422 can drop it when it rebases.
Screenshots / video
No layout change. At the end of the last YouTube track, playback stops instead of showing
ERR: reconnecting in 1s.How to test
make checkTestYTDLPipeDrainsOutputAfterFFmpegExitsreads from fixture yt-dlp and ffmpeg scripts after ffmpeg has exited. It fails on main withstreamed 0 frames, want 4096.cliamp "https://music.youtube.com/watch?v=nb8CnIo_-_A"(1:40). On main it restarts afterreconnecting in 1s; with this change playback stops.Checklist
make checkpassesdocs/andsite/index.htmlupdated for user-facing changes (none needed)🤖 Generated with Claude Code
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