Log in Register FAQ Memberlist Search pcHDTV Forum Index
pcHDTV Forum

pcHDTV Forum Index -> HD-2000/3000 drivers -> Check your v4l attributes for fine tuning your signal
Post new topic  Reply to topic View previous topic :: View next topic 
Check your v4l attributes for fine tuning your signal
PostPosted: Sun Jan 27, 2008 3:31 pm Reply with quote
BGD
 
Joined: 18 Jan 2008
Posts: 8




To get a better picture I adjusted all my Video 4 Linux attributes of brightness, contrast, etc. They were different than the defaults for whatever reason and resulted in a washed out terrible looking picture.

The command you need is "v4lctl -c /dev/videoX list" (with X being the card you wish to adjust) and this is executed from the backend server that has the tuners you wish to adjust.

bryan@granola:~# sudo v4lctl -c /dev/video0 list
attribute | type | current | default | comment
-----------+--------+---------+---------+-------------------------------------
norm | choice | NTSC-M- | PAL-BG | PAL-BG PAL-DK PAL-I PAL-M PAL-N PAL-Nc PAL-60 NTSC-M NTSC-M-JP NTSC-443 SECAM-DK SECAM-L
input | choice | Televis | Televis | Television Composite1 S-Video
audio mode | choice | mono | mono | mono stereo lang1 lang2
bright | int | 165 | 127 | range is 0 => 255
contrast | int | 25 | 63 | range is 0 => 255
color | int | 51 | 127 | range is 0 => 255
hue | int | 127 | 127 | range is 0 => 255
volume | int | 63 | 63 | range is 0 => 63
Balance | int | 64 | 64 | range is 0 => 127
mute | bool | off | on |

Setting all the attributes to the defaults was a step in the right direction:

bryan@granola:~# sudo v4lctl -c /dev/video0 setattr 'bright' 127
bryan@granola:~# sudo v4lctl -c /dev/video0 setattr 'contrast' 63
bryan@granola:~# sudo v4lctl -c /dev/video0 setattr 'color' 127

I thought this might help some poor soul out there having the same problem. Adjusting the driver works MUCH better than the suggestion on some websites of settings for each channel in Myth.

Hope this helps!

EDIT:

Hmph have to tweak each channel regardless Sad Setting all the channel brightness, etc to 0% will leave your manual configuration of the v4l settings alone. For example:

mysql -u mythtv -pmythtv -hyourhost mythconverg
mysql> update channel set contrast=0,brightness=0,colour=0,hue=0;
mysql> exit;
View user's profile Send private message
PostPosted: Fri Sep 26, 2014 4:30 am Reply with quote
aron123
 
Joined: 26 Sep 2014
Posts: 1




Thanks for share...

_________________
You can try out our JN0-360 and latest testking to get high flying success in final Boston Conservatory
View user's profile Send private message
Check your v4l attributes for fine tuning your signal
  pcHDTV Forum Index -> HD-2000/3000 drivers
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
All times are GMT - 7 Hours  
Page 1 of 1  

  
  
 Post new topic  Reply to topic  


Powered by phpBB © 2001-2003 phpBB Group
Theme created by Vjacheslav Trushkin