Matrix Elements VB-800 Manual do Utilizador descarregar pdf (Página 51)

Chapter 10. Stream from encoding cards and other

capture peripherals

Hardware encoding cards

Note: This is possible under GNU/Linux only.

VideoLAN supports two kinds of MPEG-2 encoding cards:

• Hauppauge WinTV-PVR-250 and WinTV-PVR-350,

• Visiontech Kﬁr.

The Hauppauge WinTV-PVR-250/350 gives much better results and is cheaper than the Visiontech Kﬁr.

Stream with the Hauppauge WinTV-PVR-250/350 card

Install the drivers

First, you will have to patch your kernel (version 2.4) to support the v4l2 API (Video 4 Linux version 2). The patch is

available on the Video4Linux HQ (http://bytesex.org/v4l/). If you use a 2.6 kernel, you only need to build I2C support and

the BT848 Video For Linux module.

Once your kernel is ready, install the CK version (currently in development) of the Linux drivers for the Hauppauge

WinTV-PVR-250/350. They are hosted on ivtv ck (http://67.18.1.101/~ckennedy/ivtv). You will need to patch your kernel

to use it with a 2.4. You can also use the CVS version available here: ivtv.sourceforge.net (http://ivtv.sourceforge.net/) (this

version is not developped anymore). Then, you will have to create the device and load the modules; for this, please refer to

the documentation shipped with the drivers.

Stream with VLC

Note: You must add --enable-pvr to ./conﬁgure to use this feature.

% vlc -vvv --color pvr:///dev/video0:norm=secam:size=720x576:frequency=576250:

bitrate=3000000:maxbitrate=4000000 --cr-average 1000 --sout ’#rtp{mux=ts,dst=192.168.0.42,port=5004}’ --ttl 12

where :

• /dev/video0 is the device corresponding to the encoding card ,

• norm=secam is name of the standard of the analogic signal (possible values are pal, secam, and ntsc) ,

• size=720x576 is the size of the video you want to stream ,

• frequency=567250 is the frequency in kHz of the channel you want to stream ,

• bitrate=3000000 is the average bitrate of the stream ,

• maxbitrate=4000000 is the maximum bitrate of the stream ,

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Matrix Elements VB-800 Manual do Utilizador Página 51