Webkamera Linux alatt

Hogy itt is meglegyen :

Streaming and recording video

To stream video with luvcview (plenty of options to experiment with):

luvcview -f yuv -s 320×240 -d /dev/video0

Open up the camera’s video stream in MPlayer:

mplayer -tv driver=v4l2:device=/dev/video0 tv://

Open in VLC:

vlc v4l2:///dev/video0

To make a recording I use ffmpeg… a ‘swiss army knife’ of video hackery on Linux:

ffmpeg -f oss -i /dev/dsp -f video4linux2 -s 640×480 -i /dev/video0 output.mpg

*Note: the netbook’s internal microphone is ‘/dev/dsp’

Save and open output.mpg in MPlayer or VLC. The quality of the video is rather low. When ffmpeg is running it displays the quality of the capture as q=[value] with value being a scale between 1 (best) to 31 (worst).

Some options that can quickly be modified to improve video capture are:

* increase bitrate… ‘-b’ option
* decrease frame rate… ‘-r’ option
* decrease frame size… ‘-s’ option

The -qscale option is useful. It allows setting a constant quality value with a variable bitrate. Running the previous command with a few modifications produces a decent output:

ffmpeg -f oss -i /dev/dsp -f video4linux2 -qscale 1 -r 24 -s 320×240 -i /dev/video0 output2.mpg

Now that the camera is up and working it is ready and well-suited for tasks such as video chatting and VOIP using Pidgin, Ekiga, Skype, etc.

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