Cédric Verstraeten 06e2694763 Improve seam detection and add analysis tools ...

Refine loop/restart (seam) detection and enhance the mp4 analysis tooling.

- mp4: Replace previous previous-interval-based seam heuristic with a safer approach that (1) tracks the running minimum keyframe interval (MinKeyframeGapMs) as the reference cadence and (2) requires the buffered GOP to be genuinely truncated before dropping it. This avoids false positives on variable-GOP (smart-codec) cameras. Added fields, logging updates, and helper methods: bufferedVideoCount, expectedGopFrames, bufferedVideoFrameDuration. LastKeyframeGapMs is now diagnostic only.

- cmd/mp4analyze: Add -from/-to flags and auto-select a detailed inspection window centred on the largest keyframe gap. Limit per-sample printing to that window (and anomalies), fix sync-sample bit detection, pass window to sliceHeaders, and add a compact SUMMARY health report with medians and checks. Added inspectWindow and median helpers.

- tests: Add mp4_variablegop_test.go to verify variable-GOP streams keep healthy short GOPs and that no frames are dropped by the improved seam logic.

These changes prevent healthy GOPs from being discarded on normal short GOPs that follow long static GOPs and add better diagnostics for debugging artifacts.

2026-06-15 14:44:05 +02:00

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main.go

Improve seam detection and add analysis tools

2026-06-15 14:44:05 +02:00