[pvrusb2] HVR-1950 - bad video quality

[stan schultz]

So I got the camcorder out, plugged it into the composit input and the
picture from it looks great.  As you said, that points at the tuner.  A
couple searches showed there is all kinds of discussion about bad uscable
table entries in mythtv. But I couldn't find anything truely useful.  I
tried modifying the values in /sys/class/pvrusb2/*/ctl_frequency/cur_value,
but didn't really see a positive difference ever.

Any Ideas?

Stan

On Tue, Mar 31, 2009 at 6:26 PM, Mike Isely <isely at isely.net> wrote:

> On Tue, 31 Mar 2009, stan schultz wrote:
>
> > Yes I was using the NTSC-M.  I am in Oregon and recieve my cable service
> > from Wave Broadband (aka wbcable.com).  I have tried using Mythtv and
> got
> > the same results.  I haven't tried just trying over the air, but that may
> be
> > worth trying even though we don't have the best over the air signal.  Of
> > course, as I got good reception using Windows and Cable I don't expect an
> > improvment changing to Linux and over the air.
>
> Damn.  Guess I lost my bet.  Well there's still the question of
> frequency table.  MythTV *should* be getting that right on its own
> provided you configured an video source that is "cable".  If you did
> that, then I can't explain the absolutely crappy results you are
> getting.
>
> It would be useful to figure out if the crappy video is due to tuning or
> some other aspect of the video pipeline.  There's a way to tell this
> apart: Use the composite or s-video input, which doesn't need the RF
> stage of the pipeline.  If you have a DVD player, VCR, camcorder, or
> other source of source, jack that into the device, use sysfs to switch
> that input (e.g. "echo composite > /sys/class/pvrusb2/*/ctl_input/cur_val")
> then run mplayer on the device node and see if you get a clear picture.
> If you do then you've proven that this is a tuning issue.  If the
> picture is still crap, then it's not tuning but something else totally
> bizarre going on.
>
>  -Mike
>
> --
>
> Mike Isely
> isely @ pobox (dot) com
> PGP: 03 54 43 4D 75 E5 CC 92 71 16 01 E2 B5 F5 C1 E8
> _______________________________________________
> pvrusb2 mailing list
> pvrusb2 at isely.net
> http://www.isely.net/cgi-bin/mailman/listinfo/pvrusb2
>