Ship log

A monthly field report from engineers who debug WebRTC, LiveKit, and real-time video for a living.

What broke in production this month. What's worth migrating to. What's not. Written by the same team that ships telemedicine, e-learning, OTT, and voice-AI systems — shipping video since 2005.

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Latest

July 2026 — Wowza streaming.

Field Notes ·  

How we made arbitrary MP4 files Wowza-compatible for SCTE-35 ad insertion.

2,400 words · ~ 10 min read

A debugging journey through MP4 timestamps, MPEG-TS timebases, and the subtle difference between “works in any player” and “works in a Wowza ad-insertion pipeline.”

Read the issue →
  • SetupWowza Streaming Engine, VOD MP4 ingest transmuxed to MPEG-TS for HLS, SCTE-35 markers for server-side ad insertion. Worked on our reference encodes, broke on arbitrary client MP4s.
  • SymptomAd breaks landed a few frames off, or got silently skipped. Files played cleanly in every player; nothing flagged in the Wowza ingest logs.
  • SearchGOP/keyframe alignment → HLS segment duration → SCTE-35 injection timing. Three wrong hypotheses, then the transmuxed PTS/DTS values.
  • FixNormalize each MP4 before ingest: strip edit lists, rebase timestamps to zero, force a timescale that divides cleanly into 90 kHz. Re-mux so DTS/CTS stay monotonic.
  • Takeaway"Plays everywhere" is a weak guarantee. Players forgive dirty timestamps; a transmuxing ad pipeline doesn't. Normalize MP4 timing before Wowza sees it.

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