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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 parameter "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://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://www.linuxtv.org/downloads/
- 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)
-
- http://dvbsnoop.sourceforge.net/
- DVB sniffer program to monitor, analyze, debug, dump
- or view dvb/mpeg/dsm-cc/mhp stream information (TS,
- PES, SECTION)
-
-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 packets at all
-
- Run tcpdump on the dvb0_0 interface. This sets the interface
- into promiscuous mode so it accepts any packets from the PID
- you have configured with the dvbnet utility. Check if there
- are any packets with the IP addr and MAC addr you have
- configured with ifconfig.
-
- If tcpdump doesn't give you any output, check the statistics
- which ifconfig outputs. (Note: If the MAC address is wrong,
- dvb_net won't get any input; thus you have to run tcpdump
- before checking the statistics.) If there are no packets at
- all then maybe the PID is wrong. If there are error packets,
- then either the PID is wrong or the stream does not conform to
- the MPE standard (EN 301 192, http://www.etsi.org/). You can
- use e.g. dvbsnoop for debugging.
-
-6. 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"
-
-7. What the hell are all those modules that need to be loaded?
-
- For a dvb-ttpci av7110 based full-featured card the following
- modules are loaded:
-
- - videodev: Video4Linux core module. This is the base module that
- gives you access to the "analog" tv picture of the av7110 mpeg2
- decoder.
-
- - v4l2-common: common functions for Video4Linux-2 drivers
-
- - v4l1-compat: backward compatibility layer for Video4Linux-1 legacy
- applications
-
- - dvb-core: DVB core module. This provides you with the
- /dev/dvb/adapter entries
-
- - saa7146: SAA7146 core driver. This is need to access any SAA7146
- based card in your system.
-
- - saa7146_vv: SAA7146 video and vbi functions. These are only needed
- for full-featured cards.
-
- - videobuf-dma-sg: capture helper module for the saa7146_vv driver. This
- one is responsible to handle capture buffers.
-
- - dvb-ttpci: The main driver for AV7110 based, full-featured
- DVB-S/C/T cards
-
-eof