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doc/filters: re-arrange options for testsrc family 

Additionally:
* Mention that allrgb and allyuv do not support the "size" option.
* Separate examples into subsection.

Fixes ticket #6906.

Signed-off-by: Lou Logan <lou@lrcd.com>
This commit is contained in:
Lou Logan 2017-12-11 12:46:02 -09:00
parent cbd524b26c
commit 555119bd76
1 changed files with 25 additions and 19 deletions
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doc/filters.texi
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@ -17099,28 +17099,24 @@ The sources accept the following parameters:
@table @option
@item alpha
Specify the alpha (opacity) of the background, only available in the
@code{testsrc2} source. The value must be between 0 (fully transparent) and
255 (fully opaque, the default).
@item color, c
Specify the color of the source, only available in the @code{color}
source. For the syntax of this option, check the "Color" section in the
ffmpeg-utils manual.
@item level
Specify the level of the Hald CLUT, only available in the @code{haldclutsrc}
source. A level of @code{N} generates a picture of @code{N*N*N} by @code{N*N*N}
pixels to be used as identity matrix for 3D lookup tables. Each component is
coded on a @code{1/(N*N)} scale.
@item color, c
Specify the color of the source, only available in the @code{color}
source. For the syntax of this option, check the "Color" section in the
ffmpeg-utils manual.
@item size, s
Specify the size of the sourced video. For the syntax of this option, check the
@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
The default value is @code{320x240}.
This option is not available with the @code{haldclutsrc} filter.
This option is not available with the @code{allrgb}, @code{allyuv}, and
@code{haldclutsrc} filters.
@item rate, r
Specify the frame rate of the sourced video, as the number of frames
@ -17129,9 +17125,6 @@ generated per second. It has to be a string in the format
number or a valid video frame rate abbreviation. The default value is
"25".
@item sar
Set the sample aspect ratio of the sourced video.
@item duration, d
Set the duration of the sourced video. See
@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}
@ -17140,6 +17133,14 @@ for the accepted syntax.
If not specified, or the expressed duration is negative, the video is
supposed to be generated forever.
@item sar
Set the sample aspect ratio of the sourced video.
@item alpha
Specify the alpha (opacity) of the background, only available in the
@code{testsrc2} source. The value must be between 0 (fully transparent) and
255 (fully opaque, the default).
@item decimals, n
Set the number of decimals to show in the timestamp, only available in the
@code{testsrc} source.
@ -17149,27 +17150,32 @@ timestamp value multiplied by the power of 10 of the specified
value. Default value is 0.
@end table
For example the following:
@subsection Examples
@itemize
@item
Generate a video with a duration of 5.3 seconds, with size
176x144 and a frame rate of 10 frames per second:
@example
testsrc=duration=5.3:size=qcif:rate=10
@end example
will generate a video with a duration of 5.3 seconds, with size
176x144 and a frame rate of 10 frames per second.
@item
The following graph description will generate a red source
with an opacity of 0.2, with size "qcif" and a frame rate of 10
frames per second.
frames per second:
@example
color=c=red@@0.2:s=qcif:r=10
@end example
@item
If the input content is to be ignored, @code{nullsrc} can be used. The
following command generates noise in the luminance plane by employing
the @code{geq} filter:
@example
nullsrc=s=256x256, geq=random(1)*255:128:128
@end example
@end itemize
@subsection Commands