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y4mcolorbars - Create a YUV4MPEG2 stream containing a colorbar test pattern


y4mcolorbars [options]


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 possible, given the constraints of the Y'CbCr

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


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 integer 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
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 pattern:
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 output 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.


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 bottom-field-first
interlaced 4:3 PAL source:

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

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