Ffmpeg23 Online

ffmpeg -i input.avi -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k output.mp4 ffmpeg -i input.mp4 -ss 00:01:00 -to 00:02:00 -c copy output.mp4 4.3 Extract Audio ffmpeg -i video.mkv -vn -c:a libmp3lame -b:a 320k audio.mp3 4.4 Generate a Test Pattern (Useful for debugging) ffmpeg -f lavfi -i testsrc=duration=10:size=1280x720:rate=30 -c:v libx264 test.mp4 4.5 Real-time Screen Capture (X11) ffmpeg -f x11grab -framerate 30 -video_size 1920x1080 -i :0.0 -c:v libx264 output.mkv 5. Performance Optimization FFmpeg 2.3 leverages multiple optimizations:

| Feature | Benefit | | :--- | :--- | | | MMX, SSE, AVX, AVX2 for x86; NEON for ARM. | | Threading | -threads auto for frame-level and slice-level parallelism. | | Hardware Acceleration | VAAPI (Intel), VDPAU (NVIDIA), DXVA2 (Windows). | | Presets (libx264) | ultrafast → veryslow trade encoding speed for compression. | ffmpeg23