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y4mcolorbars(1)		      MJPEG tools manual	       y4mcolorbars(1)

NAME
       y4mcolorbars  -	Create	a  YUV4MPEG2 stream containing a colorbar test
       pattern

SYNOPSIS
       y4mcolorbars [options]

DESCRIPTION
       y4mcolorbars creates a YUV4MPEG2 stream consisting entirely  of	frames
       containing  a colorbar test pattern.  The pattern attempts to reproduce
       the standard SMPTE EG-1-1990 colorbar test signal as faithfully as pos‐
       sible, given the constraints of the Y'CbCr colorspace.

       Output is to stdout to facilitate piping to other MJPEG tools.

OPTIONS
       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.
	    Common rates are:
	     24000:1001 - NTSC 3:2 pulldown converted film
		   24:1 - native film
		   25:1 - PAL/SECAM
	     30000:1001 - NTSC video [default]
		   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 inte‐
	    ger ratio.	Common ratios are:
		 1:1  - square pixels (e.g. computer graphics)
		10:11 - CCIR-601 NTSC [default]
		59:54 - CCIR-601 PAL

       -I x Set interlacing mode, used to interpret the PPM image(s), and also
	    encoded in output stream.
	     p - progressive, non-interlaced [default]
	     t - top/upper-field-first interlaced
	     b - bottom/lower-field-first interlaced

       -Q n Data to place in the "-I/+Q" patches in the bottom row of the pat‐
	    tern:
	     0 -  -I and +Q at 20% (20IRE)  [default]
	     1 -  -I and +Q at 50% (50IRE)
	     2 -  +Cb and +Cr at 100%

       -S mode
	    Set chroma subsampling mode.
		   444 - 4:4:4 (no subsampling) [default]
	       420jpeg - 4:2:0 JPEG/MPEG-1, interstitial cositing
	      420mpeg2 - 4:2:0 MPEG-2, horizontal cositing

	    The	 supported  subsampled	modes  use a lousy subsampling filter;
	    better results will be achieved by passing the default 4:4:4  out‐
	    put to a scaler which supports subsampling, such as y4mscaler(1).

       -v [0,1,2]
	    Set verbosity level.
	     0 -  warnings and errors only.
	     1 -  add informative messages, too. [default]
	     2 -  add chatty debugging message, too.

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

	    y4mcolorbars -n 200 -It -S 420jpeg | yuvplay

       To create and display 200 frames of colorbars corresponding to  a  bot‐
       tom-field-first interlaced 4:3 PAL source:

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

BUGS
       First,  it's not clear to the author (who hasn't actually ever seen the
       SMPTE EG-1-1990 document itself) what the absolute excursion of the  -I
       and  +Q	regions	 is supposed to be; however, the phase is correct, and
       that should be the critical feature.  Second, the PLUGE bars, of -4 and
       +4  IRE,	 can  never  be precisely synthesized --- the Y' digital space
       maps [16,235] over the full luma excursion, but the full luma excursion
       in  analog  space depends on whether or not 7.5 IRE NTSC setup is being
       used by whatever device eventually produces the	analog	output.	  How‐
       ever, the difference is within 1-bit of Y' accuracy anyway.

AUTHOR
       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:
	 mjpeg-users@lists.sourceforge.net

       For more info, see our website at
	      http://mjpeg.sourceforge.net

SEE ALSO
       mjpegtools(1), mpeg2enc(1), y4mscaler(1), yuv2lav(1), yuvplay(1)

MJPEG Linux Square		 28 April 2004		       y4mcolorbars(1)
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