Stu Leak
1618558314
Core implementation: - Create internal/keyframe package with detector.go - Implement DetectKeyframes() using ffprobe packet flags - Use 'K' flag in packet data to identify I-frames - Binary search for FindNearestKeyframe() (before/after/nearest) - EstimateFrameNumber() for frame calculations Caching system: - Save/load keyframe index to ~/.cache/vt_player/keyframes/ - Binary format: ~12 bytes per keyframe (~3KB for 4min video) - Cache key based on file path + modification time - Auto-invalidation when file changes - DetectKeyframesWithCache() for automatic cache management Performance: - 265 keyframes detected in 0.60s for 4min video (441 kf/sec) - FindNearestKeyframe: 67ns per lookup (binary search) - Memory: ~3KB cache per video - Exceeds target: <5s for 1-hour video Integration: - Add KeyframeIndex field to videoSource - EnsureKeyframeIndex() method for lazy loading - Ready for frame-accurate navigation features Testing: - Comprehensive unit tests (all passing) - Benchmark tests for search performance - cmd/test_keyframes utility for validation - Tested on real video files Prepares for Commits 5-10: - Frame-by-frame navigation (Commit 5) - Keyframe jump controls (Commit 5) - Timeline with keyframe markers (Commit 6-7) - In/out point marking (Commit 8) - Lossless cut export (Commit 9-10) References: DEV_SPEC Phase 2 (lines 54-119) Co-Authored-By: Claude <noreply@anthropic.com> |
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