ossrs/ffmpeg-webrtc
Jan 2025 – Mar 2025
3 Months active
Languages Used
AssemblyC
Technical Skills
ARM AssemblyARM NEON IntrinsicsDSP ImplementationEmbedded SystemsLow-level OptimizationPerformance Optimization
Krzysztof Pyrkosz
PROFILE
Krzysztof Pyrkosz
Over four months, Szabolcs Szakacs developed and optimized ARM64 NEON-accelerated audio and video processing features for the ossrs/ffmpeg-webrtc and FFmpeg/FFmpeg repositories. He implemented vectorized routines and dot-product optimizations in Assembly and C, targeting AAC encoding, color space conversions, and VVC decoding. His work included refactoring core DSP and scaling functions, introducing NEON intrinsics for throughput gains, and streamlining DMVR and BDOF paths for real-time workloads. By focusing on low-level performance tuning and maintainability, Szabolcs delivered measurable speedups and reduced CPU usage, enhancing ARM-based device support and laying a foundation for future improvements in embedded multimedia pipelines.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
18Total
Bugs
0
Commits
18
Features
9
Lines of code
1,596
Activity Months4
Your Network
258 people
Work History
September 2025
7 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary focused on DMVR-related feature delivery and BD OF performance optimizations for FFmpeg/FFmpeg's aarch64 VVC decoder. The month prioritized feature delivery and performance improvements with careful attention to ARM NEON optimization and code-path efficiency. No explicit major bug fixes were documented this month; the work aimed at increasing decoding throughput and hardware compatibility for ARM-based platforms. The changes lay groundwork for further VVC decoder enhancements and performance tuning in subsequent cycles.
7 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary focused on DMVR-related feature delivery and BD OF performance optimizations for FFmpeg/FFmpeg's aarch64 VVC decoder. The month prioritized feature delivery and performance improvements with careful attention to ARM NEON optimization and code-path efficiency. No explicit major bug fixes were documented this month; the work aimed at increasing decoding throughput and hardware compatibility for ARM-based platforms. The changes lay groundwork for further VVC decoder enhancements and performance tuning in subsequent cycles.
September 2025
March 2025
4 Commits • 4 Features
Mar 1, 2025March 2025 — ossrs/ffmpeg-webrtc: Delivered significant ARM64/NEON performance improvements across critical video processing paths. Implemented vectorized refactors and dot-product optimizations that boost throughput and reduce CPU usage on AArch64, with conditional compilation for portability. Key achievements include refactoring hscale_16_to_15__fs_4 for 16-to-15 bit scaling, dot-product based RGBA32→Y conversion, vvc_avg enhancements for 8/10/12-bit depths, and NEON-accelerated vvc_dmvr improvements. These changes drive higher real-time encoding/decoding performance and energy efficiency on ARM64 devices.
March 2025
4 Commits • 4 Features
Mar 1, 2025March 2025 — ossrs/ffmpeg-webrtc: Delivered significant ARM64/NEON performance improvements across critical video processing paths. Implemented vectorized refactors and dot-product optimizations that boost throughput and reduce CPU usage on AArch64, with conditional compilation for portability. Key achievements include refactoring hscale_16_to_15__fs_4 for 16-to-15 bit scaling, dot-product based RGBA32→Y conversion, vvc_avg enhancements for 8/10/12-bit depths, and NEON-accelerated vvc_dmvr improvements. These changes drive higher real-time encoding/decoding performance and energy efficiency on ARM64 devices.
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025 — ossrs/ffmpeg-webrtc: ARM64 NEON performance optimizations across audio and video pipelines to boost real-time WebRTC throughput and reduce CPU usage. Delivered two major feature sets: (1) AArch64 NEON audio codec optimizations: simplified opus_postfilter_neon; optimized ac3_sum_square_butterfly_int32_neon. Commits: 9fb97215dfb2f1933cc2b959f29734a0671323eb; e8d4c559871ef93fc94a8efb8144f1738eba4c62. (2) AArch64 NEON color space and pixel format conversions: RGB24 to YUV12 optimization; NEON-accelerated YUYV/UYVY to YUV conversions. Commits: 64107e22f545d3899f9270751531997734d89a3d; b92577405b40b6eb5ecf0036060e34e0219da1e3. No major bugs fixed this month; overall impact is improved throughput and reduced CPU usage for audio/video processing in WebRTC workloads on ARM64 devices, enabling lower latency and higher quality streams. Technologies demonstrated: ARM64 NEON, Opus DSP, AC3 butterfly optimization, SWScale neon paths.
4 Commits • 2 Features
Feb 1, 2025February 2025 — ossrs/ffmpeg-webrtc: ARM64 NEON performance optimizations across audio and video pipelines to boost real-time WebRTC throughput and reduce CPU usage. Delivered two major feature sets: (1) AArch64 NEON audio codec optimizations: simplified opus_postfilter_neon; optimized ac3_sum_square_butterfly_int32_neon. Commits: 9fb97215dfb2f1933cc2b959f29734a0671323eb; e8d4c559871ef93fc94a8efb8144f1738eba4c62. (2) AArch64 NEON color space and pixel format conversions: RGB24 to YUV12 optimization; NEON-accelerated YUYV/UYVY to YUV conversions. Commits: 64107e22f545d3899f9270751531997734d89a3d; b92577405b40b6eb5ecf0036060e34e0219da1e3. No major bugs fixed this month; overall impact is improved throughput and reduced CPU usage for audio/video processing in WebRTC workloads on ARM64 devices, enabling lower latency and higher quality streams. Technologies demonstrated: ARM64 NEON, Opus DSP, AC3 butterfly optimization, SWScale neon paths.
February 2025
January 2025
3 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary focusing on key features, fixes, impact, and skills demonstrated for ossrs/ffmpeg-webrtc.
January 2025
3 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary focusing on key features, fixes, impact, and skills demonstrated for ossrs/ffmpeg-webrtc.
Activity
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Quality Metrics
Correctness99.4%
Maintainability80.0%
Architecture83.4%
Performance100.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
AssemblyC
Technical Skills
ARM AssemblyARM NEON IntrinsicsARM64 AssemblyAssembly LanguageAssembly Language ProgrammingAssembly ProgrammingAudio ProcessingDSP ImplementationEmbedded SystemsImage ScalingLow-Level OptimizationLow-level OptimizationNEON IntrinsicsPerformance OptimizationPerformance Tuning
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline
FFmpeg/FFmpeg
Sep 2025 – Sep 2025
1 Month active
Languages Used
AssemblyC
Technical Skills
ARM AssemblyARM NEON IntrinsicsAssembly LanguageAssembly Language ProgrammingAssembly ProgrammingEmbedded Systems