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Forcing the order of capture card registration: FIXED!! http://forums.linhes.org/viewtopic.php?f=2&t=17944 |
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Author: | tuatara [ Sat Feb 23, 2008 11:49 pm ] |
Post subject: | Forcing the order of capture card registration: FIXED!! |
I have an EPIA MII 12000 with a PVR-350 and PVR-250. I decided to replace the 250 with a Hauppauge Nova-S-Plus digital satellite card. [Short aside - if you do this, the Nova's audio gets registered before the onboard VIA audio. You can tell because'cat /proc/asound/cards' shows cx88 as card #0 and VIA as card #1. This immediately causes all output to hang. You need to blacklist the cx88 audio driver (cx88_alsa) in /etc/hotplug/blacklist.d/alsa-base. A nasty little trick. ] After making the switch, I cleaned out and readded the capture cards. All good so far. BUT periodically the Nova-S DVB card and PVR-350 seem to swap - on one boot the '350 will be video0 and the DVB video1, and on the next boot they swap. If I then re-delete and re-add the 'capture card' entries it all works again. The question is: how do I force the order of these cards. Thanks in advance for any advice/tips. Paul. Below I attach today's dump from /var/log/messages. You can see 1 swap (I've only booted a couple of times today. Look for lines with "cx88... registered device", you can see video0 or video1 during different boots. root@mythtv:/var/log# grep video messages Feb 24 12:00:54 mythtv kernel: Linux video capture interface: v2.00 Feb 24 12:00:54 mythtv kernel: cx88[0]/0: registered device video0 [v4l2] Feb 24 12:00:54 mythtv kernel: ivtv0: Registered device video1 for encoder MPEG Feb 24 12:00:54 mythtv kernel: ivtv0: Registered device video32 for encoder YUV Feb 24 12:00:54 mythtv kernel: ivtv0: Registered device video24 for encoder PCM audio Feb 24 12:00:54 mythtv kernel: ivtv0: Registered device video16 for decoder MPEG Feb 24 12:00:54 mythtv kernel: ivtv0: Registered device video48 for decoder YUV Feb 24 17:37:28 mythtv kernel: Linux video capture interface: v2.00 Feb 24 17:37:28 mythtv kernel: ivtv0: Registered device video0 for encoder MPEG Feb 24 17:37:28 mythtv kernel: ivtv0: Registered device video32 for encoder YUV Feb 24 17:37:28 mythtv kernel: ivtv0: Registered device video24 for encoder PCM audio Feb 24 17:37:28 mythtv kernel: ivtv0: Registered device video16 for decoder MPEG Feb 24 17:37:28 mythtv kernel: ivtv0: Registered device video48 for decoder YUV Feb 24 17:37:28 mythtv kernel: cx88[0]/0: registered device video1 [v4l2] |
Author: | tuatara [ Sun Feb 24, 2008 1:42 am ] |
Post subject: | Using /etc/modutils/actions and "pre-install" does |
Using advice from: http://knoppmyth.net/phpBB2/viewtopic.php?t=1131 I tried adding: Code: pre-install bttv modprobe ivtv pre-remove bttv rmmod ivtv to /etc/modutils/actions. This didn't work. In case something else related to the Nova-S card was being loaded first, and therefore grabbing video0 first, I expanded this list to: Code: pre-install bttv modprobe ivtv
pre-install cx88_blackbird modprobe ivtv pre-install cx24110 modprobe ivtv pre-install dvb_bt8xx modprobe ivtv pre-install cx88_dvb modprobe ivtv pre-install cx8802 modprobe ivtv pre-install cx8800 modprobe ivtv pre-install cx88xx modprobe ivtv pre-install video_buf modprobe ivtv pre-install cx22702 modprobe ivtv Still no joy. In fact when I made this change to /etc/modutils/actions, the two cards swapped and now the DVB card is stubbornly loading first (even though the lines above should be causing ivtv to load first). A number of people in the forums suggest adjusting modules.conf, which is not recommended since thats now an auto-generated file. Is there another way to force load order? Am I missing something? Thanks again. Paul. |
Author: | jbm2131 [ Sun Feb 24, 2008 11:40 am ] |
Post subject: | |
If you're using a relatively new version (R5E50 or later), then udev is what decides the order. This long thread discusses how you can force udev to do what you want -> http://mysettopbox.tv/phpBB2/viewtopic.php?t=13882. Personally, I prefer the symlink approach (posted by no2u) talked about on the 3rd page. I like having the dev's linked to some name that tells you exactly which device it is. Once I understood what to do, it was pretty simple to setup and it has worked flawlessly. EDIT: Look here as well -> http://www.mythtv.org/wiki/index.php/Device_Filenames_and_udev http://www.knoppmythwiki.org/index.php?page=Udev |
Author: | tuatara [ Mon Feb 25, 2008 2:16 am ] |
Post subject: | Fixed! |
That did it - thanks very much. In the hope that this might help someone else - here's what I did after reading the links above. I added a new file video.rules to /etc/udev. Code: root@mythtv:~# cat /etc/udev/video.rules KERNEL=="video[0-9]*", SYSFS{name}=="cx88*", DRIVERS=="cx8800", SYMLINK+="video-Nova-S" KERNEL=="video[0-9]*", SYSFS{name}=="ivtv? encoder MPEG", DRIVERS=="ivtv", SYMLINK+="video-pvr350" Then linked in a z99_video.rules, to make it the last to load. Code: root@mythtv:~# ls -l /etc/udev/rules.d/z99_video.rules lrwxrwxrwx 1 root root 14 Feb 25 20:42 /etc/udev/rules.d/z99_video.rules -> ../video.rules So my video0 and video1 entries still switch between the Nova-S DVB card and the PVR-350, but there are 2 new symbolic links which are always correct: Code: root@mythtv:~# ls -l /dev/video-*
lrwxrwxrwx 1 root root 6 Feb 25 20:49 /dev/video-Nova-S -> video0 lrwxrwxrwx 1 root root 6 Feb 25 20:50 /dev/video-pvr350 -> video1 Now you run mythtv-setup, and configure the PVR-350 to point to /dev/video-pvr350 rather than /dev/video0 or video1. Cheers. Paul. If you have multiple pvr-350s you might have to add an ID entry to the video.rules to differentiate them. |
Author: | bkamen [ Sun Jan 10, 2010 8:01 pm ] |
Post subject: | |
I think in this section: Code: root@mythtv:~# ls -l /etc/udev/rules.d/z99_video.rules
lrwxrwxrwx 1 root root 14 Feb 25 20:42 /etc/udev/rules.d/z99_video.rules -> ../video.rules you want ln -s and not 'ls' No? Cheers, Ben[/u] |
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