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Christian PillsburyandClaude Opus 4.8
b4c7db2653
For live, presentation.duration is Infinity as soon as the presentation resolves — before any segment appends. updateMediaSourceDuration is composed before the buffer actors, so its entry runs while the MediaSource is freshly open and empty: write Infinity synchronously there (no buffered clamp needed, Infinity ≥ any range). This gets ahead of the first append, which would otherwise set duration to the buffered end (MSE coded-frame-processing) and pin the live stream to a finite, live-edge duration — the async wait-for-idle path loses that race because a live loader appends continuously. VoD keeps the existing wait-open/idle + clamp + write-once-while-NaN path. Verified against a live Mux CMAF stream: mediaSource.duration is Infinity from the start, no finite transient. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>