V4L capturing

TV Recording applications

• DVR -- Digital Video Recorder for Linux
• ffmpeg
• fftv
• Freevo -- open-source digital video jukebox
• mencoder
  • the channel scripts
  • the capture scripts
• MythTV -- a Personal Video Recorder project
• streamer
• transcode
• videodog

Other frame grabbers

• See webcams

Common configuration and control commands

1. v4l2ucp -- universal control panel for v4l2 (available for Debian from Marillat)

2. Command-line control the TV card (v4lctl is a part of the xawtv package)

• v4lctl -c /dev/video0 list
• v4lctl -c /dev/video0 bright "60%"
• v4lctl -c /dev/video0 contrast "55%"

3. Capture the stream

• streamer (part of the xawtv package):

Usage:

streamer -i 1 -c /dev/video0 -s 320x240 -q -j 80 -f jpeg -n ntsc -b 24 -o /var/www/webcam.jpeg

streamer -i 1 -c /dev/video0 -s 320x240 -q -j 80 -f jpeg -n ntsc -b 24 -o /dev/stdout |uuencode thief.jpeg|sendmail alarm@foo.com

• videodog:

Usage:

videodog -x 640 -y 480 -w 3 -b 1 -c 65535 -m PAL -q -d /dev/video0 -j -f /var/www/webcam.jpg

• mencoder
• webcam:

This useful tool supports continuously moving (ftp or scp - ssh copy) of jpeg output to remote server. Also allows put in additional text (date time, location), rotating of image.

Usage:

webcam /etc/webcamrc

See webcams for model and driver details

Compression formats

• Fourcc site
• H264 -- a highly compressed codec optimized for streaming
• xvid -- free mpeg4 codec