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1 | Some very frequently asked questions about linuxtv-dvb |
2 | |
3 | 1. The signal seems to die a few seconds after tuning. |
4 | |
5 | It's not a bug, it's a feature. Because the frontends have |
6 | significant power requirements (and hence get very hot), they |
7 | are powered down if they are unused (i.e. if the frontend device |
8 | is closed). The dvb-core.o module parameter "dvb_shutdown_timeout" |
9 | allow you to change the timeout (default 5 seconds). Setting the |
10 | timeout to 0 disables the timeout feature. |
11 | |
12 | 2. How can I watch TV? |
13 | |
14 | The driver distribution includes some simple utilities which |
15 | are mainly intended for testing and to demonstrate how the |
16 | DVB API works. |
17 | |
18 | Depending on whether you have a DVB-S, DVB-C or DVB-T card, use |
19 | apps/szap/szap, czap or tzap. You must supply a channel list |
20 | in ~/.[sct]zap/channels.conf. If you are lucky you can just copy |
21 | one of the supplied channel lists, or you can create a new one |
22 | by running apps/scan/scan. If you run scan on an unknown network |
23 | you might have to supply some start data in apps/scan/initial.h. |
24 | |
25 | If you have a card with a built-in hardware MPEG-decoder the |
26 | drivers create a video4linux device (/dev/v4l/video0) which |
27 | you can use to watch TV with any v4l application. xawtv is known |
28 | to work. Note that you cannot change channels with xawtv, you |
29 | have to zap using [sct]zap. If you want a nice application for |
30 | TV watching and record/playback, have a look at VDR. |
31 | |
32 | If your card does not have a hardware MPEG decoder you need |
33 | a software MPEG decoder. Mplayer or xine are known to work. |
34 | Newsflash: MythTV also has DVB support now. |
35 | Note: Only very recent versions of Mplayer and xine can decode. |
36 | MPEG2 transport streams (TS) directly. Then, run |
37 | '[sct]zap channelname -r' in one xterm, and keep it running, |
38 | and start 'mplayer - < /dev/dvb/adapter0/dvr0' or |
39 | 'xine stdin://mpeg2 < /dev/dvb/adapter0/dvr0' in a second xterm. |
40 | That's all far from perfect, but it seems no one has written |
41 | a nice DVB application which includes a builtin software MPEG |
42 | decoder yet. |
43 | |
44 | Newsflash: Newest xine directly supports DVB. Just copy your |
45 | channels.conf to ~/.xine and start 'xine dvb://', or select |
46 | the DVB button in the xine GUI. Channel switching works using the |
47 | numpad pgup/pgdown (NP9 / NP3) keys to scroll through the channel osd |
48 | menu and pressing numpad-enter to switch to the selected channel. |
49 | |
50 | Note: Older versions of xine and mplayer understand MPEG program |
51 | streams (PS) only, and can be used in conjunction with the |
52 | ts2ps tool from the Metzler Brother's dvb-mpegtools package. |
53 | |
54 | 3. Which other DVB applications exist? |
55 | |
56 | http://www.cadsoft.de/people/kls/vdr/ |
57 | Klaus Schmidinger's Video Disk Recorder |
58 | |
59 | http://www.metzlerbros.org/dvb/ |
60 | Metzler Bros. DVB development; alternate drivers and |
61 | DVB utilities, include dvb-mpegtools and tuxzap. |
62 | |
63 | http://sourceforge.net/projects/dvbtools/ |
64 | Dave Chapman's dvbtools package, including |
65 | dvbstream and dvbtune |
66 | |
67 | http://www.linuxdvb.tv/ |
68 | Henning Holtschneider's site with many interesting |
69 | links and docs |
70 | |
71 | http://www.dbox2.info/ |
72 | LinuxDVB on the dBox2 |
73 | |
74 | http://www.tuxbox.org/ |
75 | http://cvs.tuxbox.org/ |
76 | the TuxBox CVS many interesting DVB applications and the dBox2 |
77 | DVB source |
78 | |
79 | http://www.linuxtv.org/downloads/ |
80 | DVB Swiss Army Knife library and utilities |
81 | |
82 | http://www.nenie.org/misc/mpsys/ |
83 | MPSYS: a MPEG2 system library and tools |
84 | |
85 | http://mplayerhq.hu/ |
86 | mplayer |
87 | |
88 | http://xine.sourceforge.net/ |
89 | http://xinehq.de/ |
90 | xine |
91 | |
92 | http://www.mythtv.org/ |
93 | MythTV - analog TV PVR, but now with DVB support, too |
94 | (with software MPEG decode) |
95 | |
96 | http://dvbsnoop.sourceforge.net/ |
97 | DVB sniffer program to monitor, analyze, debug, dump |
98 | or view dvb/mpeg/dsm-cc/mhp stream information (TS, |
99 | PES, SECTION) |
100 | |
101 | 4. Can't get a signal tuned correctly |
102 | |
103 | If you are using a Technotrend/Hauppauge DVB-C card *without* analog |
104 | module, you might have to use module parameter adac=-1 (dvb-ttpci.o). |
105 | |
106 | 5. The dvb_net device doesn't give me any packets at all |
107 | |
108 | Run tcpdump on the dvb0_0 interface. This sets the interface |
109 | into promiscous mode so it accepts any packets from the PID |
110 | you have configured with the dvbnet utility. Check if there |
111 | are any packets with the IP addr and MAC addr you have |
112 | configured with ifconfig. |
113 | |
114 | If tcpdump doesn't give you any output, check the statistics |
115 | which ifconfig outputs. (Note: If the MAC address is wrong, |
116 | dvb_net won't get any input; thus you have to run tcpdump |
117 | before checking the statistics.) If there are no packets at |
118 | all then maybe the PID is wrong. If there are error packets, |
119 | then either the PID is wrong or the stream does not conform to |
120 | the MPE standard (EN 301 192, http://www.etsi.org/). You can |
121 | use e.g. dvbsnoop for debugging. |
122 | |
123 | 6. The dvb_net device doesn't give me any multicast packets |
124 | |
125 | Check your routes if they include the multicast address range. |
126 | Additionally make sure that "source validation by reversed path |
127 | lookup" is disabled: |
128 | $ "echo 0 > /proc/sys/net/ipv4/conf/dvb0/rp_filter" |
129 | |
130 | 7. What the hell are all those modules that need to be loaded? |
131 | |
132 | For a dvb-ttpci av7110 based full-featured card the following |
133 | modules are loaded: |
134 | |
135 | - videodev: Video4Linux core module. This is the base module that |
136 | gives you access to the "analog" tv picture of the av7110 mpeg2 |
137 | decoder. |
138 | |
139 | - v4l2-common: common functions for Video4Linux-2 drivers |
140 | |
141 | - v4l1-compat: backward compatibility layer for Video4Linux-1 legacy |
142 | applications |
143 | |
144 | - dvb-core: DVB core module. This provides you with the |
145 | /dev/dvb/adapter entries |
146 | |
147 | - saa7146: SAA7146 core driver. This is need to access any SAA7146 |
148 | based card in your system. |
149 | |
150 | - saa7146_vv: SAA7146 video and vbi functions. These are only needed |
151 | for full-featured cards. |
152 | |
153 | - videobuf-dma-sg: capture helper module for the saa7146_vv driver. This |
154 | one is responsible to handle capture buffers. |
155 | |
156 | - dvb-ttpci: The main driver for AV7110 based, full-featured |
157 | DVB-S/C/T cards |
158 | |
159 | eof |
160 |
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