To see the list of cards currently recognized by your system check the
files @file{/proc/asound/cards} and @file{/proc/asound/devices}.
-For example to capture with @file{ffmpeg} from an ALSA device with
+For example to capture with @command{avconv} from an ALSA device with
card id 0, you may run the command:
@example
-ffmpeg -f alsa -i hw:0 alsaout.wav
+avconv -f alsa -i hw:0 alsaout.wav
@end example
For more information see:
Documentation/fb/framebuffer.txt included in the Linux source tree.
To record from the framebuffer device @file{/dev/fb0} with
-@file{ffmpeg}:
+@command{avconv}:
@example
-ffmpeg -f fbdev -r 10 -i /dev/fb0 out.avi
+avconv -f fbdev -r 10 -i /dev/fb0 out.avi
@end example
You can take a single screenshot image with the command:
@example
-ffmpeg -f fbdev -vframes 1 -r 1 -i /dev/fb0 screenshot.jpeg
+avconv -f fbdev -frames:v 1 -r 1 -i /dev/fb0 screenshot.jpeg
@end example
See also @url{http://linux-fbdev.sourceforge.net/}, and fbset(1).
@file{jack_lsp}.
Follows an example which shows how to capture a JACK readable client
-with @file{ffmpeg}.
+with @command{avconv}.
@example
-# Create a JACK writable client with name "ffmpeg".
-$ ffmpeg -f jack -i ffmpeg -y out.wav
+# Create a JACK writable client with name "libav".
+$ avconv -f jack -i libav -y out.wav
# Start the sample jack_metro readable client.
$ jack_metro -b 120 -d 0.2 -f 4000
system:capture_2
system:playback_1
system:playback_2
-ffmpeg:input_1
+libav:input_1
metro:120_bpm
-# Connect metro to the ffmpeg writable client.
-$ jack_connect metro:120_bpm ffmpeg:input_1
+# Connect metro to the avconv writable client.
+$ jack_connect metro:120_bpm libav:input_1
@end example
For more information read:
representing the OSS input device, and is usually set to
@file{/dev/dsp}.
-For example to grab from @file{/dev/dsp} using @file{ffmpeg} use the
+For example to grab from @file{/dev/dsp} using @command{avconv} use the
command:
@example
-ffmpeg -f oss -i /dev/dsp /tmp/oss.wav
+avconv -f oss -i /dev/dsp /tmp/oss.wav
@end example
For more information about OSS see:
@url{http://manuals.opensound.com/usersguide/dsp.html}
+@section pulse
+
+pulseaudio input device.
+
+To enable this input device during configuration you need libpulse-simple
+installed in your system.
+
+The filename to provide to the input device is a source device or the
+string "default"
+
+To list the pulse source devices and their properties you can invoke
+the command @file{pactl list sources}.
+
+@example
+avconv -f pulse -i default /tmp/pulse.wav
+@end example
+
+@subsection @var{server} AVOption
+
+The syntax is:
+@example
+-server @var{server name}
+@end example
+
+Connects to a specific server.
+
+@subsection @var{name} AVOption
+
+The syntax is:
+@example
+-name @var{application name}
+@end example
+
+Specify the application name pulse will use when showing active clients,
+by default it is "libav"
+
+@subsection @var{stream_name} AVOption
+
+The syntax is:
+@example
+-stream_name @var{stream name}
+@end example
+
+Specify the stream name pulse will use when showing active streams,
+by default it is "record"
+
+@subsection @var{sample_rate} AVOption
+
+The syntax is:
+@example
+-sample_rate @var{samplerate}
+@end example
+
+Specify the samplerate in Hz, by default 48kHz is used.
+
+@subsection @var{channels} AVOption
+
+The syntax is:
+@example
+-channels @var{N}
+@end example
+
+Specify the channels in use, by default 2 (stereo) is set.
+
+@subsection @var{frame_size} AVOption
+
+The syntax is:
+@example
+-frame_size @var{bytes}
+@end example
+
+Specify the number of byte per frame, by default it is set to 1024.
+
+@subsection @var{fragment_size} AVOption
+
+The syntax is:
+@example
+-fragment_size @var{bytes}
+@end example
+
+Specify the minimal buffering fragment in pulseaudio, it will affect the
+audio latency. By default it is unset.
+
@section sndio
sndio input device.
representing the sndio input device, and is usually set to
@file{/dev/audio0}.
-For example to grab from @file{/dev/audio0} using @file{ffmpeg} use the
+For example to grab from @file{/dev/audio0} using @command{avconv} use the
command:
@example
-ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav
+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
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 the command @file{v4l-info} 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.
-ffplay -s 320x240 -f video4linux /dev/video0
-
-# Grab and show the input of a video4linux2 device, autoadjust size.
-ffplay -f video4linux2 /dev/video0
+# Grab and show the input of a video4linux2 device.
+avplay -f video4linux2 -framerate 30 -video_size hd720 /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.
-ffmpeg -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
@var{hostname}:@var{display_number}.@var{screen_number} specifies the
X11 display name of the screen to grab from. @var{hostname} can be
-ommitted, and defaults to "localhost". The environment variable
+omitted, and defaults to "localhost". The environment variable
@env{DISPLAY} contains the default display name.
@var{x_offset} and @var{y_offset} specify the offsets of the grabbed
Use the @file{dpyinfo} program for getting basic information about the
properties of your X11 display (e.g. grep for "name" or "dimensions").
-For example to grab from @file{:0.0} using @file{ffmpeg}:
+For example to grab from @file{:0.0} using @command{avconv}:
@example
-ffmpeg -f x11grab -r 25 -s cif -i :0.0 out.mpg
+avconv -f x11grab -r 25 -s cif -i :0.0 out.mpg
# Grab at position 10,20.
-ffmpeg -f x11grab -r 25 -s cif -i :0.0+10,20 out.mpg
+avconv -f x11grab -r 25 -s cif -i :0.0+10,20 out.mpg
@end example
@subsection @var{follow_mouse} AVOption
For example:
@example
-ffmpeg -f x11grab -follow_mouse centered -r 25 -s cif -i :0.0 out.mpg
+avconv -f x11grab -follow_mouse centered -r 25 -s cif -i :0.0 out.mpg
# Follows only when the mouse pointer reaches within 100 pixels to edge
-ffmpeg -f x11grab -follow_mouse 100 -r 25 -s cif -i :0.0 out.mpg
+avconv -f x11grab -follow_mouse 100 -r 25 -s cif -i :0.0 out.mpg
+@end example
+
+@subsection @var{show_region} AVOption
+
+The syntax is:
+@example
+-show_region 1
+@end example
+
+If @var{show_region} AVOption is specified with @var{1}, then the grabbing
+region will be indicated on screen. With this option, it's easy to know what is
+being grabbed if only a portion of the screen is grabbed.
+
+For example:
+@example
+avconv -f x11grab -show_region 1 -r 25 -s cif -i :0.0+10,20 out.mpg
+
+# With follow_mouse
+avconv -f x11grab -follow_mouse centered -show_region 1 -r 25 -s cif -i :0.0 out.mpg
@end example
@c man end INPUT DEVICES
projects / ffmpeg / blobdiff