On Mon, Oct 30, 2006 at 07:07:05PM +0000, Andrew Lyon wrote: >>On Mon, Oct 30, 2006 at 04:19:09PM +0000, Andrew Lyon wrote: >>Also make sure you use recent drivers from the dvb repo, a patch I wrote >>was committed a day or two ago, and without it, my CAM would lock up by >>simply using a remote control (which would in turn produce lots of >>interesting error messages). > >I am using a Technotrend S-1500 + CI + CAM, Ive not had errors when >using the remote, but I do get problems with my card/cam if I change >channels too quickly, and sometimes if i just leave myth running in >the main menu, when I watch tv it always gets lock, but I get a blank >screen for a long time and eventually a video error or I have to kill >mythfrontend, stopping the backend, removing and reloading budget_ci >and restarting the backend usually cures it, I ended up adding a menu >item for that but its not a nice solution :(. I have more or less the same problems. I spent some time last week debugging it but I didn't get that far. >Really not sure what is wrong, I can leave it playing a encrypted >channel for days at a time, but if I change channels a few times it >stops working, I have a feeling perhaps the cam is not responding >quickly enough to commands, are there any timeout values I could try >changing? If you're feeling adventurous, you might try recompiling MythTV. In mythtv/libs/libmythtv/dvbcam.cpp, function DVBCam::CiHandlerLoop(), there is a usleep(250) which I suspect is way to low. The CI specification (EN50221) says it's fine to poll every 100ms, so try setting it to 90000 or so (this ain't 100% correct because MythTV might still want the shorter timeout to read replies etc...but it's a start if you want to spend some effort debugging). Additionally, you might want to change mythtv/libs/libmythtv/dvbdev/dvbci.cpp, find the line in the beginning that says: static bool DebugProtocol = false; and change it to static bool DebugProtocol = true; which will give you much more debug info if/when the card acts up.
Excellent, thanks, thats just what I needed to get started debugging it.
>My dvb-s card (Avermedia 777) and Freeview channels do not have the >same problem. It seems very dependent on the CAM that you're using. I'm using an AlphaCrypt with 3.09 firmware, which seems extremely picky. For instance, I was earlier using an extra long cable to connect the CI board with the C-1500 board, and that caused constant lockups and errors (within seconds, cammenu was barely useable) and things improved when I used the original (shorter) cable again. I'm going to spend more time debugging my C-1500 when I have some more time to spend :) -- David Härdeman
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