Проект OpenNet: MAN y4mcolorbars (1) Команды и прикладные программы пользовательского уровня (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

y4mcolorbars (1)

>> y4mcolorbars (1) ( Linux man: Команды и прикладные программы пользовательского уровня )

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. This stream is ready for further processing by the mpeg2enc(1) MPEG encoder and image processing filters like yuvscaler(1).

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. (default: 30000:1001) Common rates are:
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
b - bottom/lower-field-first interlaced
-S mode: Set chroma subsampling mode. (default: 420_jpeg)
420_jpeg - 4:2:0 JPEG/MPEG-1, interstitial cositing
420_mpeg2 - 4:2:0 MPEG-2, horizontal cositing
Changing the subsampling mode from the default won't necessarily make anything better. This option is just for experimenting.
-v [0,1,2]: Set verbosity level.
0 = warnings and errors only.
1 = add informative messages, too.
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 | 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

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

Партнёры:

Хостинг:

Закладки на сайте
Проследить за страницей

Created 1996-2024 by Maxim Chirkov
Добавить, Поддержать, Вебмастеру