Month: 2025-08 — FFmpeg/FFmpeg: Focus on accurate duration propagation from IMF samples to AVPacket to improve playback accuracy and processing reliability.

June 2025 monthly summary focused on stabilizing the media processing pipeline in ossrs/ffmpeg-webrtc. The month centered on a critical bug fix in the FFmpeg demuxer to improve reliability across diverse media configurations, with measurable business value in reduced crash risk and smoother deployments. Key features delivered: - Stability improvement in the FFmpeg demuxer by implementing robust handling for codec_id changes when avcodec_open2 fails, enabling stable demuxing for media files with varying codec configurations. Major bugs fixed: - FFmpeg demuxer crash caused by avcodec_open2 failure: ensured codec_close correctly handles scenarios where the codec ID changes, preventing segmentation faults during demuxing. Commit: 59a6660625675c8343f3de858b93c8294f05bb52. Overall impact and accomplishments: - Significantly improved runtime stability for media ingestion and processing in the OSSRS/ffmpeg-webrtc stack, reducing crash surfaces and support incidents related to demuxing across formats. - Enabled broader media compatibility, supporting formats with dynamic codec configurations and improving user experience in streaming pipelines. Technologies/skills demonstrated: - C/C++ and FFmpeg internals, particularly demuxer error handling and lifecycle management. - Defensive programming to handle edge cases in codec lifecycle. - Change traceability and impact assessment through commit-level collaboration.

May 2025 monthly summary for ossrs/ffmpeg-webrtc: Delivered a reliability-focused fix in the MPEG-TS demuxer to update stream information when PMT ES stream_type changes. This ensures accurate stream identification across codec transitions, improving playback stability and downstream processing reliability in dynamic streaming scenarios.

February 2025: Focused engineering effort on stability and correctness of caption parsing within the ossrs/ffmpeg-webrtc project. Delivered a targeted bug fix that improves reliability of EIA-608 caption handling for QuickTime in FFmpeg, reducing edge-case failures and aligning with existing FFmpeg trac work.

November 2024: Delivered targeted stability and alignment improvements in ossrs/ffmpeg-webrtc. Implemented fixes to the zscale filter’s alignment and plane-count handling and enhanced av_frame_get_buffer to honor explicit data pointer alignment. These changes reduce processing errors, improve robustness of the zscale path, and strengthen memory alignment guarantees across FFmpeg components, benefiting transcoding and real-time streaming workloads. Demonstrated proficiency in low-level C, FFmpeg internals, and thorough commit-driven development.