usage: y4mcolorbars [options] Creates a YUV4MPEG2 stream consisting of frames containing a standard colorbar test pattern (SMPTE, 75%). Options: (defaults specified in []) -n n frame count (output n frames) [1] -W w frame width [720] -H h frame height [480] -F n:d framerate (as ratio) [30000:1001] -A w:h pixel aspect ratio [10:11] -I x interlacing [p] p = none/progressive t = top-field-first b = bottom-field-first -Q n content of -I/Q areas: [0] 0 = 20% -I,+Q 1 = 50% -I,+Q 2 = 100% +Cb,+Cr -S mode chroma subsampling mode [444] '420jpeg' -> 4:2:0 JPEG/MPEG-1 (interstitial) '420mpeg2' -> 4:2:0 MPEG-2 (horiz. cositing) '444' -> 4:4:4 (no subsampling) -v n verbosity (0,1,2) [1]