Hi, the following command generates an MP4 file which can be played by ffplay but results in corrupted video when playing it with mplayer/vlc/quicktime: $ ffmpeg -f lavfi -i testsrc -vcodec libx264 -pix_fmt yuv422p -y out422p.mp4 Any idea? -- FFmpeg = Frightening & Forgiving Minimal Perennial Erudite Gladiator