Things Developers Believe About Video Files (Proven Wrong by User Uploads)
summary
Millions of user uploads across petabytes reveal concrete failure modes: frame properties change per-frame, timestamps are missing or negative, and sample durations often don’t exist so seeking breaks; codecs hide invisible frames and containers carry unexpected alpha overlay tracks that require blending; packet interleaving is nonsequential, stereo channels can phase-cancel to silence on mono devices, and early WebM lacks durations. The talk lists actual debugging tools and a catalog of reproducible gotchas rather than high-level platitudes.
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