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v4l2: update documentation

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Update the examples and remove stale information.
Video4linux support had been already removed.
This commit is contained in:
Luca Barbato 2012-03-03 12:24:56 +01:00
parent 1255eed533
commit af49e1766b
1 changed files with 10 additions and 24 deletions
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doc/indevs.texi
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@ -254,9 +254,9 @@ command:
avconv -f sndio -i /dev/audio0 /tmp/oss.wav
@end example
@section video4linux and video4linux2
@section video4linux2
Video4Linux and Video4Linux2 input video devices.
Video4Linux2 input video device.
The name of the device to grab is a file device node, usually Linux
systems tend to automatically create such nodes when the device
@ -264,33 +264,19 @@ systems tend to automatically create such nodes when the device
kind @file{/dev/video@var{N}}, where @var{N} is a number associated to
the device.
Video4Linux and Video4Linux2 devices only support a limited set of
Video4Linux2 devices usually support a limited set of
@var{width}x@var{height} sizes and framerates. You can check which are
supported for example with the command @file{dov4l} for Video4Linux
devices and using @command{-list_formats all} for Video4Linux2 devices.
supported using @command{-list_formats all} for Video4Linux2 devices.
If the size for the device is set to 0x0, the input device will
try to autodetect the size to use.
Only for the video4linux2 device, if the frame rate is set to 0/0 the
input device will use the frame rate value already set in the driver.
Some usage examples of the video4linux2 devices with avconv and avplay:
Video4Linux support is deprecated since Linux 2.6.30, and will be
dropped in later versions.
Follow some usage examples of the video4linux devices with the ff*
tools.
@example
# Grab and show the input of a video4linux device, frame rate is set
# to the default of 25/1.
avplay -s 320x240 -f video4linux /dev/video0
# Grab and show the input of a video4linux2 device.
avplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
# Grab and show the input of a video4linux2 device, autoadjust size.
avplay -f video4linux2 /dev/video0
# Grab and record the input of a video4linux2 device, autoadjust size,
# frame rate value defaults to 0/0 so it is read from the video4linux2
# driver.
avconv -f video4linux2 -i /dev/video0 out.mpeg
# Grab and record the input of a video4linux2 device, leave the
framerate and size as previously set.
avconv -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg
@end example
@section vfwcap