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       y4mcolorbars [options]


       y4mcolorbars  creates  a   YUV4MPEG2   stream   consisting
       entirely  of  frames  containing  a colorbar test pattern.
       This  stream  is  ready  for  further  processing  by  the
       mpeg2enc(1) MPEG encoder and image processing filters like

       Output is to stdout to facilitate piping  to  other  MJPEG


       y4mcolorbars accepts the following options:

       -n num
            Output a total of 'num' output frames.  (default: 1)

       -F n:d
            Set  framerate  encoded in output stream, as an exact
            integer ratio.  (default:  30000:1001)  Common  rates
             24000:1001 - NTSC 3:2 pulldown converted film
                   24:1 - native film
                   25:1 - PAL/SECAM
             30000:1001 - NTSC video
                   50:1 - PAL field rate
             60000:1001 - NTSC field rate

       -W w Set frame width. (default: 720)

       -H h Set frame height. (default: 480)

       -A n:d
            Set  pixel  aspect ratio encoded in output stream, as
            an exact integer ratio.   (default:   10:11)   Common
            ratios are:
                 1:1  - square pixels (computer graphics)
                10:11 - CCIR-601 NTSC
                59:54 - CCIR-601 PAL

       -I x Set  interlacing  mode,  used  to  interpret  the PPM
            image(s),  and  also  encoded   in   output   stream.
            (default:  'p')
             p - progressive, non-interlaced
             t - top/upper-field-first interlaced
             1 = add informative messages, too.
             2 = add chatty debugging message, too.


       To create and display 200 frames of colorbars  correspond­
       ing to a top-field-first interlaced 4:3 NTSC source:

            y4mcolorbars -n 200 -It | yuvplay

       To  create and display 200 frames of colorbars correspond­
       ing to a bottom-field-first interlaced 4:3 PAL source:

            y4mcolorbars -n 200 -H 576 -F 25:1  -A  59:54  -Ib  |


       This man page was written by Matt Marjanovic.
       If  you have questions, remarks, problems or you just want
       to contact the developers, the main mailing list  for  the
       MJPEG-tools is:

       For more info, see our website at


       mjpegtools(1),   mpeg2enc(1),   yuvscaler(1),  yuv2lav(1),

MJPEG Linux Square       13 November 2001         y4mcolorbars(1)

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