Matrix Elements VB-800 Uživatelský manuál stáhnout pdf (Strana 56)

Chapter 11. Stream from a DV camcorder

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 libraw1394

(http://www.linux1394.org/) and libavc1394 (http://sourceforge.net/projects/libavc1394) from their projects website.

• if you have a distribution that uses udev (http://kernel.org/pub/linux/utils/kernel/hotplug), 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}:std{access=mmsh,mux=asfh,url=:8080}’ --sout-transcode-fps=25.0

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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