MythTV DVB Setup Guide Part 3
Compiled by Martin Smith
V0.20 March 2005 (For MythTV 0.17)
Kenneth Aafl°y sent me the following text on using MythTV with a
Conditional Access Module to access encrypted transmissions. I don't
have one of these devices as none of the transmissions I can access
require them. Also note that not all PCI adapters have the necessary
hardware to support them. He has also sent me a note on using the 2.6
kernel and the DVB drivers.
I suppose I should note that there are now some encrypted channels on
DVB-T in the UK. I'm unlikely to be paying to see them though so I
doubt I'll be playing with a CAM anytime soon.
Conditional Access Module Support
There is limited support for using a CAM in MythTV, limited as in;
there is no support for the CAM menus (yet). When using a CAM to decrypt channels the CAM needs to
know which channel to decrypt, so the ServiceID
in the channel setup needs to be entered correctly.
When using a CAM you will receive something like this in your
mythbackend log output:
Starting up as the master server.
This next line is important, as it tells you that mythbackend was able
to open a connection to the CAM Slots.
2004-01-14 16:04:40 DVB#0 Using DVB card 0, with frontend STV0299/TSA5059/SL1935 based.
2004-01-14 16:04:40 DVB#0 Trying to tune to channel 99.
2004-01-14 16:04:40 DVB#0 Frequency: 11325000 Symbol Rate: 24500000 Pol: H Inv:Off
2004-01-14 16:04:40 DVB#0 Setting LNB: Tone OFF 18V
2004-01-14 16:04:40 DVB#0 Waiting for frontend event after tune.
2004-01-14 16:04:40 DVB#0 Status: CARRIER | VITERBI | SIGNAL | SYNC | LOCK.
2004-01-14 16:04:40 mythbackend version: 0.14.20040102-1 www.mythtv.org
2004-01-14 16:04:40 Enabled verbose msgs : important general channel
2004-01-14 16:04:40 DVB#0 CAM Support initialized successfully.
This line will tell you that this type of CAM is ready to be used.
2004-01-14 16:04:42 Found changes in the todo list.
CAM: Conax 4.00e, 01, 0B00, 04B1
This line tells you that the required data has been sent to the CAM,
and you should expect a picture very soon.
2004-01-14 16:04:45 DVB#0 Sending PMT to CAM in slot 1.
2.6 Kernel Notes
Kenneth sent me the
following notes based on a problem people have been having:
"It has been mentioned before that you should not at all include the
path of the linux-2.6 kernel include tree,
that is private to the kernel. Either copy the files under include/linux/dvb to
another directory structure with linux/dvb
in it, and point mythtv to that. Or download the latest linuxtv driver package, and point mythtv to
the include dir in there."
Also note that the linuxtv driver may be a slightly different and newer
than the one shipped with the latest released 2.6 kernel.
My main MythTV system now runs Fedora Core 3
(with a stock 2.6 kernel
rather than a RedHat patched one). I didn't notice any problems
switching to the 2.6 DVB drivers and as 2.6 also includes Alsa sound
drivers it's a couple less things to worry about after each future
The Fedora kernels include the DVB drivers. If you build custom kernels
Video For Linux and DVB will need to be enabled. Compile the DVB
modules you need or all of them if you're not sure. Don't compile this
sort of code into the kernel directly even if you have the option.
Sometimes you can get round problems by removing and reinserting
drivers, avoiding the need for a reboot.
The 2.6 kernel includes Alsa drivers and deprecates the OSS ones. I
haven't enabled the Alsa code in MythTV yet and I haven't noticed any
problems with 2.6 Alsa audio drivers in OSS compatible mode.
Firefox Users Read This!
These pages currently see about 200-300Mb of traffic a month. As of
November 2004 Firefox
is now the most used browser to access this site, taking 38% of traffic
overall. For comparison in July 2004 it was only 2.5% so it's easy to
see the remendous progress this browser has made this year.
I'm sticking to Mozilla but I
thought anyone unfortunately still reading this in Internet
Explorer might like to know that they are now officially in the
This is unlikely to become an exhaustive list of places to find DVB
information. I'll add sites and resources that I've found useful while
setting up my system.
|Came across this utility today
for dumping out and decoding DVB streams. I haven't tried it yet but it
|Answers to frequent questions,
mostly about Freeview / DVB-T in the UK
|The Metzler Brothers
|Useful drivers and utilities
including REPLEX for working with DVB streams.
Last Updated March 2005.
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