On 10/30/06, David Härdeman <david@xxxxxxxxxxx> wrote:
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).
Wow!, changing usleep to 90000 seems to have completely fixed the problem :), Ive changed channel over and over again and even by entering channel numbers really quickly I cannot make it fail. The channel change time seems the same too, I will see how it goes in the next few days and report back again. Thanks for your suggestion, didnt it work as well for you? Andy
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. >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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