Documentation:Streaming HowTo/Stream from a DV Camcorder

2009-02-26T16:51:31Z

Korla Plankton: /* Stream with DV */

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Note: This is possible under GNU/Linux only.

==Install the libraw1394 and libavc1394==

If you want to be able to stream from a DV camcorder, then you need to install the libraries libraw1394 and libavc1394:

*if you use a Fedora Core distribution then you just need to install the libraries using:
% '''yum update'''
% '''yum install libraw1394 libavc1394'

*if you want to install the libraries from the source then you must download them from the [http://www.linux1394.org/ libraw1394] and [http://sourceforge.net/projects/libavc1394 libavc1394] from their projects website.

*if you have a distribution that uses [http://kernel.org/pub/linux/utils/kernel/hotplug udev], then you must add/change the following line to the file 50-udev.rules in your /etc/udev/rules.d directory.
% '''vi /etc/udev/rules.d/50-udev.rules'''
# IEEE1394 (firewire) devices (must be before raw devices below)
KERNEL=="raw1394", NAME="%k"
KERNEL=="dv1394", NAME="dv1394/%k"
KERNEL=="video1394*", NAME="video1394/%n"

The following sections assume that you have a working linux installation with the IEEE 1394 (Firewire) libraries installed, either manually from the source code or through your distributions upgrade mechanism.

==Stream with DV==

Connect the DV camcorder with a Firewire cable to your computer, and check the creation of the file '''/dev/raw1394'''.

Run VLC with the following command line:
% '''vlc -vvv dv/rawdv:///dev/raw1394 --dv-caching 10000 --sout '#transcode{vcodec=WMV2,vb=512,scale=1,acodec=mp3,ab=192,channels=2,fps=25.0}:std{access=mmsh,mux=asfh,url=:8080}' '''
where:
*'''dv/rawdv://''' is the DV input and '''/dev/raw1394''' the device file,
*'''dv-caching''' is the delay is miliseconds (ms) (start with a high value, 10s or so, and lower it later),
*'''sout''' is the stream output chain that is used to stream the DV camcorder as a multimedia stream over the network. The '''transcode''' syntax is explained in the chapter about transcoding. The example as given above generates a multimedia stream that is compatible with Windows Media Player,
*'''sout-transcode-fps''' is the number of pictures per second '''25.0''' that the transcode module should generate of the requested audio/video codec.

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Documentation:Streaming HowTo/Stream from a DV Camcorder