2009/12/3 Johan Persson <[email protected]>
>
> With the risk of being obvious. (I assume this is an analogue card and that
>
> your input is analogue PAL B/G.)
>
v4l2-ctl -d 1 --list-standards
...
index : 6
ID : 0x0000000000000007
Name : PAL-BG
Frame period: 1/25
Frame lines : 625
...
v4l2-ctl -d 1 -s 6
Standard set to 00000007
v4l2-ctl -d 1 -S
Video standard = 0x00000007
PAL-B/B1/G
> 1. The looks on the video seems to indicate poor reception. Is the card
>
> tuned to the right frequency (and is the frequency one of the official
>
> channels?) You could for example use "scantv" (in v4l2-tools) to search for
>
> active channels. How do you adjust the frequency ? Via MythTV or directly
>
> via "ivtv-tune" (or by you own program)
>
Trying to get it working from the command line first. That way I know if
the problem is myth.
I can't get a frequency table because my cable company, voo, are clowns.
However googling suggests the europe-west table, and that's what I use, e.g.
ivtv-tune -d /dev/video1 -t europe-west -c SE12
I've also tried fine-tuning the frequency by going up and down in small
increments from the one that gives some picture using
v4l2-ctl -d 1 -f <freq>
And in all cases it gets worse.
Don't have v4l2-tool. It doesn't appear to be part of ivtv-utils-1.4.0
2. Are all your identified channels equally bad ?
>
Some are a little worse, they're a bit worse on the tv too. Not any I'm
interested in.
3. Is there any chance of plugging in an ordinary TV on the same cable and
>
> if so, does this give a "perfect" picture?
>
There's an old small TV in the den and the big one in the lounge is on the
end of a long coax (hence the splitter I mentioned).
I wouldn't say perfect, but considerably better.
>
> 4. Are the channels identified by your "real" TV the same channels you are
>
> using?
>
I don't understand what you mean. If you're asking if those channels are
visible on the TV, then yes.
However for reasons mentioned above I don't know if the TVs are tuned to the
same frequency. They just show a graphic not the exact number.
>
> 5. Have you captured the videos by simple doing a cat /dev/video0 >
>
> mymovie.mpg ? (or whatever device you system is using)
>
Yes, that's how I created the samples.
>
> 6. Have you simply tried another coax cable?
>
Yes, it was the first thing I tried. No effect. As I mentioned, bypassing
the splitter did help. With it in place I barely see anything.
>
> Some answers to the questions above might help to pinpoint your issues, and
>
> I might be able to give some more assistance.
>
>
>
> /Johan
>
>
>
> (I recently spent some time writing some PVR SW using ivtv so so I'm fairly
>
> up to speed on the interfaces - and I'm pretty convinced your results are
>
> due to either poor reception or bad HW)
>
>
>
>
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