[mythtv-users] New IVTV Changes

[Rich West]

Jeff volckaert wrote:
>>> Adding the following...
>>>
>>> /usr/bin/v4l2-ctl --set-ctrl=spatial_filter=4
>>> /usr/bin/v4l2-ctl --set-ctrl=temporal_filter=4
>>>       
>> The response I rcv is that these are not controls when I query:
>>
>> $ v4l2-ctl --get-ctrl=spatial_filter
>>
>> How come?
>>     
> You need to load the modules first?  You have a PVR150?
>
> Here is what I have in "/etc/rc.d/rc.local":
> modprobe ivtv
> /usr/bin/v4l2-ctl --set-ctrl=spatial_filter=4
> /usr/bin/v4l2-ctl --set-ctrl=temporal_filter=4
> /usr/bin/v4l2-ctl -c brightness=170
> /usr/bin/v4l2-ctl -c saturation=127

The ivtv list has some good information on all of these settings.  Check
out the following link for a complete description of the options and
what they do:
http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec-single/v4l2.html#AEN807

And the following thread:
http://www.gossamer-threads.com/lists/engine?do=post_view_printable;post=33617;list=ivtv

That particular thread has some interesting information:
> "Basically the temporal filter is by far the most important. The spatial
> filter also has some effect, although the default value seems to be the
> best. I've never noticed any difference with the median filter and I
> suspect they are actually not implemented in the card's firmware."  - Hans
and
> "The default [for temporal filter] is 0 for the 2.6.18 and 8 for the
> 2.6.19 kernel. Both are
> actually wrong :-( It should be 8 for full resolution capture and 0 for
> scaled capture."
>
> Hans 

I hope this helps. :)

-Rich