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Stefan Breunig

PROFILE

Stefan Breunig

Worked on the FFmpeg/FFmpeg and ossrs/ffmpeg-webrtc repositories, focusing on video processing filter stability, streaming protocol correctness, and automated testing. Improved the Frei0r filter by correcting timing semantics and enhancing plugin compatibility, using C programming and in-depth filter development. Expanded test coverage for edge cases, including realigned input dimensions and plugin-based video filters, to prevent regressions and ensure reliable processing. Addressed HLS byterange logic for iframe-only streaming, fixing byte offset calculations and adding targeted tests. Maintained code quality through cleanup and build automation, resulting in more robust streaming deployments and a maintainable codebase across C and Makefile environments.

Overall Statistics

Feature vs Bugs

60%Features

Repository Contributions

7Total
Bugs
2
Commits
7
Features
3
Lines of code
104
Activity Months3

Work History

April 2026

4 Commits • 2 Features

Apr 1, 2026

April 2026 monthly summary: Delivered targeted testing enhancements, corrected HLS byterange logic, and performed maintainability improvements across FFmpeg repos. Focused on validating plugin-based video filters, ensuring reliable iframe-only streaming, and reducing technical debt.

November 2025

2 Commits • 1 Features

Nov 1, 2025

November 2025 monthly summary for FFmpeg/FFmpeg focused on stabilizing the Frei0r filter pathway and expanding test coverage to prevent timing-related regressions in real-time video processing. Key feature delivered: - Frei0r filter stability and robustness improvements: corrected time handling when input frames are realigned and added tests to ensure Distort0r handles unaligned input dimensions, increasing reliability of video processing. Major bugs fixed: - Fixed time handling in avfilter/vf_frei0r when input is realigned to ensure correct PTS propagation and timing accuracy; accompanying regression tests added to prevent reoccurrence. Overall impact and accomplishments: - Improved reliability of the video processing pipeline in FFmpeg, reducing timing glitches in real-time filtering, and reducing risk of downstream output inconsistencies. - Strengthened QA through targeted regression tests for edge-case input alignment, enabling smoother maintenance and faster iteration. Technologies/skills demonstrated: - C/C++ codebase changes in FFmpeg, specifically in avfilter and filter-video components - Time-stamping (PTS) handling, input realignment edge-cases, and filter graph robustness - Test-driven development with regression tests for realigned input dimensions

July 2025

1 Commits

Jul 1, 2025

Month: 2025-07. Summary of work focused on stabilizing timing semantics for FFmpeg's Frei0r filter and maintaining overall repository quality. Delivered a targeted bug fix that corrects how timing is passed, improving plugin compatibility and runtime reliability.

Activity

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Quality Metrics

Correctness97.2%
Maintainability88.6%
Architecture88.6%
Performance88.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

CMakefile

Technical Skills

C programmingbuild automationbuild systemsfilter developmentstreaming protocolstestingvideo processing

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

FFmpeg/FFmpeg

Jul 2025 Apr 2026
3 Months active

Languages Used

CMakefile

Technical Skills

C programmingfilter developmentvideo processingtestingbuild systems

ossrs/ffmpeg-webrtc

Apr 2026 Apr 2026
1 Month active

Languages Used

CMakefile

Technical Skills

C programmingbuild automationstreaming protocolstestingvideo processing