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Some very frequently asked questions about linuxtv-dvb
1. The signal seems to die a few seconds after tuning.
It's not a bug, it's a feature. Because the frontends have
significant power requirements (and hence get very hot), they
are powered down if they are unused (i.e. if the frontend device
is closed). The dvb-core.o module paramter "dvb_shutdown_timeout"
allow you to change the timeout (default 5 seconds). Setting the
timeout to 0 disables the timeout feature.
2. How can I watch TV?
The driver distribution includes some simple utilities which
are mainly intended for testing and to demonstrate how the
DVB API works.
Depending on whether you have a DVB-S, DVB-C or DVB-T card, use
apps/szap/szap, czap or tzap. You must supply a channel list
in ~/.[sct]zap/channels.conf. If you are lucky you can just copy
one of the supplied channel lists, or you can create a new one
by running apps/scan/scan. If you run scan on an unknown network
you might have to supply some start data in apps/scan/initial.h.
If you have a card with a built-in hardware MPEG-decoder the
drivers create a video4linux device (/dev/v4l/video0) which
you can use to watch TV with any v4l application. xawtv is known
to work. Note that you cannot change channels with xawtv, you
have to zap using [sct]zap. If you want a nice application for
TV watching and record/playback, have a look at VDR.
If your card does not have a hardware MPEG decoder you need
a software MPEG decoder. Mplayer or xine are known to work.
Newsflash: MythTV also has DVB support now.
Note: Only very recent versions of Mplayer and xine can decode.
MPEG2 transport streams (TS) directly. Then, run
'[sct]zap channelname -r' in one xterm, and keep it running,
and start 'mplayer - < /dev/dvb/adapter0/dvr0' or
'xine stdin://mpeg2 < /dev/dvb/adapter0/dvr0' in a second xterm.
That's all far from perfect, but it seems no one has written
a nice DVB application which includes a builtin software MPEG
decoder yet.
Newsflash: Newest xine directly supports DVB. Just copy your
channels.conf to ~/.xine and start 'xine dvb://', or select
the DVB button in the xine GUI. Channel switching works using the
numpad pgup/pgdown (NP9 / NP3) keys to scroll through the channel osd
menu and pressing numpad-enter to switch to the selected channel.
Note: Older versions of xine and mplayer understand MPEG program
streams (PS) only, and can be used in conjunction with the
ts2ps tool from the Metzler Brother's dvb-mpegtools package.
3. Which other DVB applications exist?
http://www.cadsoft.de/people/kls/vdr/
Klaus Schmidinger's Video Disk Recorder
http://www.metzlerbros.org/dvb/
Metzler Bros. DVB development; alternate drivers and
DVB utilities, include dvb-mpegtools and tuxzap.
http://www.linuxstb.org/
http://sourceforge.net/projects/dvbtools/
Dave Chapman's dvbtools package, including
dvbstream and dvbtune
http://www.linuxdvb.tv/
Henning Holtschneider's site with many interesting
links and docs
http://www.dbox2.info/
LinuxDVB on the dBox2
http://www.tuxbox.org/
http://cvs.tuxbox.org/
the TuxBox CVS many interesting DVB applications and the dBox2
DVB source
http://sourceforge.net/projects/dvbsak/
DVB Swiss Army Knife library and utilities
http://www.nenie.org/misc/mpsys/
MPSYS: a MPEG2 system library and tools
http://mplayerhq.hu/
mplayer
http://xine.sourceforge.net/
http://xinehq.de/
xine
http://www.mythtv.org/
MythTV - analog TV PVR, but now with DVB support, too
(with software MPEG decode)
4. Can't get a signal tuned correctly
If you are using a Technotrend/Hauppauge DVB-C card *without* analog
module, you might have to use module parameter adac=-1 (dvb-ttpci.o).
5. The dvb_net device doesn't give me any multicast packets
Check your routes if they include the multicast address range.
Additionally make sure that "source validation by reversed path
lookup" is disabled:
$ "echo 0 > /proc/sys/net/ipv4/conf/dvb0/rp_filter"
eof
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