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Force audio rate to 90khz to comply with rtsp spec#74
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This patch implements comprehensive RTSP timestamp normalization for perfect audio/video sync: 1. Audio frame timestamp improvements: - Added timestamp field back to H264NALUnit structure - Start timestamps at zero instead of the raw encoder value - Calculate precise frame durations based on sample rate - Switch to microsecond precision for better accuracy 2. Video timestamp normalization: - Base timestamps from a zero reference point - Handle cases with missing or zero timestamps - Add small increments for frames in the same batch - Avoid zero and negative timestamps 3. Timestamp tracking infrastructure: - Added base_timestamp and timestamp_initialized fields to streams - Store the first timestamp as reference for normalization - Reset timestamp on new connections - Proper initialization in constructors 4. Better error handling: - Drop oversized frames instead of partial delivery - Start with non-zero timestamps to avoid player errors - Enhanced first frame handling This approach ensures timestamps for both audio and video start from zero and increment in perfect synchronization, preventing any A/V sync issues in players like mpv.
This commits addresses several critical issues with RTSP stream synchronization: 1. Non-Zero Stream Start Time: - Streams were starting at arbitrary large timestamps (around 30000+ seconds) - Now normalized to start from zero for proper player compatibility 2. Audio/Video Sync Drift: - Added base_timestamp and timestamp_initialized fields to both streams - First frame timestamp is now exactly zero for clean synchronization - Implemented independent timestamp resets to prevent long-term drift 3. Frame Handling and Buffer Management: - Added 1ms frame pacing delay for regular frames - Added 3ms delay for larger I-frames to prevent network buffer overflows - Improved detection and handling of oversized frames - Added frame drop tracking and error reporting 4. AudioReframer Improvements: - Modified to use precise frame duration calculations with high precision - Implemented periodic timestamp reset (every 300 frames) - Better timestamp normalization for consistent audio timing These changes together create a robust synchronization system that maintains proper A/V sync across different players and network conditions. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
… duration calculation
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Reference https://datatracker.ietf.org/doc/html/rfc6416#:~:text=default%20value%20of-,90,-kHz%2C%20unless%20specified