SegmentTimeline Pattern for Audio #272
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Implements DASH Edition 6 Pattern mechanism for audio SegmentTimeline with $Time$ template. Automatically detects repeating duration patterns caused by audio frame alignment with video segments. Features: - Pattern detection with 1.25 cycle threshold for practical use - Canonical pattern representation starting with longest duration - Exact pattern entry (PE) calculation for timing alignment - URL generator option for "SegmentTimeline with $Time$ using Pattern" - Comprehensive test coverage including complex 24s audio-video cycles - Support for AAC-LC, AC-3, and HE-AAC frame alignment scenarios Pattern detection handles cases like: - 4-segment AAC patterns in 2s video segments - 8-segment patterns in alternating 4s+2s video (24s LCM cycle) - Audio frame misalignment creating cyclic duration variations
…ressing - Add segtimelinenr_pattern/ URL option for SegmentTimeline with $Number$ and Pattern - Extend pattern detection to support both $Time$ and $Number$ addressing modes - Update URL generator with new pattern option for number-based addressing - Tests to check that SegmentTimeline Pattern is same for both modes
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This PR adds options to use DASH Ed. 6 patterns for audio SegmentTimelines with Time or Number.
The URL signaling is
segtimeline_patternandsegtimelinenr_patterninstead ofsegtimeline_1orsegtimelinenr_1.A good sequence for testing this is testpic_2s where audio has a cycle of 4 segments to align with video.
Should solve #270.