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potential fix for OOM

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James Magahern
2026-05-02 00:05:11 -07:00
parent 0ec8f0faf9
commit acd73436a7
2 changed files with 45 additions and 9 deletions
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AGENTS.md
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@@ -121,6 +121,8 @@ Important behavior:
- Uses bounded branch queues via `createRelayInputBranch`.
- Pauses upstream reading while any branch queue exceeds half of `MAX_RELAY_BRANCH_QUEUE_BYTES`.
- Stops playback if any branch queue exceeds `MAX_RELAY_BRANCH_QUEUE_BYTES`.
- Backpressure accounting must include both chunks queued in JavaScript and bytes already written to ffmpeg stdin while waiting for `drain`. Otherwise fast movie sources can outrun realtime ffmpeg consumption and grow Node heap until OOM.
- When waiting for relay capacity, wait only on branches that are actually over the pause threshold. Including already-ready branches in a `Promise.race` can create an immediate-resolution spin loop.
Relay mode works best for sequential stream containers such as MPEG-TS/IPTV. It may be less reliable for file formats that require seeking or late metadata, such as some MP4 files.