I definitely see an improvement on some channels, but not others.
Weird.
Still, any improvement is good improvement!
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| Improve picture quality for Hauppauge PVR Cards on R5E50 http://forums.linhes.org/viewtopic.php?f=3&t=13257 |
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| Author: | craigtv [ Tue Jan 02, 2007 10:15 pm ] |
| Post subject: | Improve picture quality for Hauppauge PVR Cards on R5E50 |
After upgrading from R5D1 to R5E50 (thanks tjc for the excellent post) I noticed the picture quality didn't seem as good from my two PVR-150's. In poking around on the ivtv mailing list, it appears that the 0.8.2 version of ivtv changed the defaults on a filtering setting ... in particular the temporal filter. You can determine the current setting with the following command ... Code: v4l2-ctl -C temporal_filter -d 0 I found it was zero, and it appears the recommended value should be 8, for a full screen capture (720x480). You can change it with this command ... Code: v4l2-ctl -c temporal_filter=8 -d 0 Note the -d 0 parameter on both these commands refers to the value of your video device. If you have multiple cards you'll have to set it for both. In my case I set it for devices 0 and 1. If you ssh into your box while it's playing LiveTV, you can see the changes in real time. In my case it has made a significant difference in quality, with no impact on performance because it's a parameter on the hardware encoder. Note that the change does not persist after a reboot, so you'll have to add the command(s) to .... Code: /home/mythtv/.fluxbox/apps
or other location so the commands are issued at startup. You can read more about the issue here ... http://www.gossamer-threads.com/lists/ivtv/users/33616?#33616 and more about other filter parameters here ... http://www.gossamer-threads.com/lists/ivtv/users/33617?#33617 Craig |
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| Author: | rsay [ Sat Jan 13, 2007 1:53 pm ] |
| Post subject: | |
Thanks, This made an easily noticeable improvement on my analog cable input. (On my clean digital cable signal it made things worse.) No overhead penalty that I could detect with top. I went into the box via ssh and issued the commands to change the temporal filter while the tv was running and you could watch the change occur in live time. The difference was big enough that my wife and kids (8 & 11) could easily notice the change so this is not a subtle improvement for me. I added the following line to the /home/mythtv/.fluxbox/apps file as you recommended to make things permanent: Code: [startup] {v4l2-ctl -c temporal_filter=8 -d 2}
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| Author: | tjc [ Sat Jan 13, 2007 3:44 pm ] |
| Post subject: | |
That's what /etc/init.d/set_ivtv_params is for... |
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| Author: | craigtv [ Sat Jan 13, 2007 5:32 pm ] |
| Post subject: | |
I didn't set it in set_ivtv_params because it still uses the ivtvctl command rather than v4l2-ctl. The implication in the ivtv wiki is that v4l2-ctl is taking over most of the functions of ivtvctl, but I couldn't find specifics. Do you know if it would work to just change the definition of IVTVCTL set_ivtv_params to v4l2-ctl? |
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| Author: | tjc [ Sat Jan 13, 2007 5:40 pm ] |
| Post subject: | |
It would not. There is a patched version I need to post. Look for it over in the upgrade hint thread. |
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| Author: | craigtv [ Sat Jan 13, 2007 5:46 pm ] |
| Post subject: | |
Will do. Thanks!! |
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| Author: | Martian [ Mon Jan 15, 2007 11:52 pm ] |
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Thanks for the fix guys!!! This made a dramatic improvement with my PVR-500. I can actually watch a little bit of Standard Definition TV now without wanting to vomit. My wife noticed the improvement as well. For those who are lazy the fix is here: http://mysettopbox.tv/phpBB2/viewtopic. ... 8&start=30 fifth post down. Martian |
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| Author: | opel70 [ Tue Jan 16, 2007 10:55 am ] |
| Post subject: | |
Thanks, I'll have to give this a try when I get my new PVR-150 this week. |
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| Author: | seano [ Wed Jan 17, 2007 10:27 pm ] |
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Any ideas why my R5E50 box doesn't know what "temporal_filter" is? Code: root@mythtv:~# v4l2-ctl -C temporal_filter -d 0
unknown control 'temporal_filter' Thanks! -seano |
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| Author: | tjc [ Wed Jan 17, 2007 10:50 pm ] |
| Post subject: | |
Dunno. Use the list option to dump the control settings it knows about and their current values. Are you sure it's really R5E50? We had someone else who'd gotten an R5D1 image from one of the mirrors... Code: cat /etc/KnoppMyth-version
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| Author: | crushinator [ Sun Jan 21, 2007 5:02 pm ] |
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seano wrote: Any ideas why my R5E50 box doesn't know what "temporal_filter" is?
Code: root@mythtv:~# v4l2-ctl -C temporal_filter -d 0 unknown control 'temporal_filter' Here are the things that I learned about this command. Hope it helps: 1. The command is "v4l2-ctl" with the letter "L" not the number "1". 2. The capitalization of "-C" or "-c" is important. Uppercase "-C" means "get the value of the control", in this case temporal_filter. Lowercase "-c" means "set the value of the control." Get the value v4l2-ctl -C temporal_filter -d 0 Set the value to 8 v4l2-ctl -c temporal_filter=8 -d 0 3. The "-d" parameter is "device number." So I have a BTTV WinTV-Go tuner card as "video0" and an IVTV PVR-150 tuner card as "video1." This "temporal_filter" command is only applicable to the IVTV card, so I needed to use "-d 1" to specify it. v4l2-ctl -C temporal_filter -d 1 Otherwise, the "-d 0" command went to the "video0" and it returned "unknown control." |
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| Author: | tjc [ Sun Jan 21, 2007 7:31 pm ] |
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Run v4l2-ctl --help | more to see all of the options. BTW - Lest there be any confusion about look alike letters and numbers that's "Victor-Four-Lima-Two-Dash-Charlie-Tango-Lima" all in lowercase. |
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| Author: | strick1226 [ Mon Jan 29, 2007 4:06 pm ] |
| Post subject: | |
I definitely see an improvement on some channels, but not others. Weird. Still, any improvement is good improvement!
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| Author: | seano [ Mon Feb 19, 2007 10:19 pm ] |
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tjc wrote: Dunno. Use the list option to dump the control settings it knows about and their current values. Are you sure it's really R5E50? We had someone else who'd gotten an R5D1 image from one of the mirrors...
Code: cat /etc/KnoppMyth-version Turns out my card's sorta dead... http://www.mysettopbox.tv/phpBB2/viewtopic.php?t=14224 Which is why it's not responding at -d 0 -SeanO |
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| Author: | bode77 [ Sat Mar 03, 2007 1:00 am ] |
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Am I missing something, I did tjc's "Updated /etc/init.d/set_ivtv_params script" from the hints page. I changed the value in the script for temporal_filter to 8. But this didn't hold through a reboot. Is that supposed to work? I had to modify the the fluxbox setting to make it stick. If anyone can clarify that for me, I would much appreciate it. |
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