FFmpeg Outputs: HLS, Thumbnails & Storage #59

Goal

Pipe the RTP from Day 1 into FFmpeg and produce MP4 (archive), HLS/LL-HLS segments
(VOD playback), and periodic thumbnails.

Why this matters

§9: FFmpeg muxes to MP4, segments to HLS (.m3u8 + .ts), and extracts thumbnails.
HLS output is also the basis for the large-scale HLS hybrid (§15).

Tasks

• Spawn FFmpeg with the Day 1 SDP as input (RTP ingest)
• Output MP4 mux for archive/download
• Output HLS / LL-HLS (.m3u8 + .ts segments) for VOD playback
• Extract thumbnails (-vf fps=1/10 → every 10s + a poster frame)
• Write outputs to scratch (instance store / EFS); bound disk usage
• Handle FFmpeg lifecycle: start with recording, stop cleanly on stream end, capture errors

Acceptance criteria

• A short test stream yields a valid playable MP4 and an HLS playlist + segments
• Thumbnails are generated at the configured interval
• FFmpeg exits cleanly on stop; failures are logged (not silent)

Notes

Segment as you go — don't wait for stream end (sets up streaming upload on Day 3).
Work on the video quality resolution.