Lessons Learned: Low Latency Ingest
summary
Caffeine reimplements its ingest gateway in Go using Pion, libav, HighVisions go‑SRT, Cisco open hq64 and Comcast go‑TS and ships it in August. A decade‑old ffmpeg SRTP bug causes srtcp signature verification errors because ffmpeg uses 4 bytes instead of the spec 10 bytes so the gateway removes the final six bytes of each SRTCP packet as a practical workaround. Large keyframes at a 2s keyframe interval cause ~0.25–0.33s pauses; fixes include an adaptive jitter buffer and encoder tuning and the team also writes its own go binding for libav.
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chapters (7)
- 0:00Low latency ingest at Caffeine TV
- 1:49Rewriting media ingest system
- 4:58Four lessons learned
- 7:44FFmpeg SRTP signature issues
- 9:29Go bindings for AV lib challenges
- 11:13WebRTC frame pacing delays
- 16:33Summary & Q&A
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