[mythtv-users] dvb-t picture problems - ideas?

[Gary Dawes]

Both of my problems seem to be capture related rather than playback as I
tend to watch a lot of recordings on the laptop in the kitchen, which has
Windows and mythtvplayer on it, and I get the picture breakup on there on
dvb recordings as well as on the frontend, although it doesn't support live
tv. I do have deinterlacing turned on on mythfrontend - bob, as it has
always seemed to be the best alrounder. None on the mythtvplayer and
windows. And I have checked the same recording on both. I performed another
channel scan today, as well as changing the recording mode to "tv only"
rather than normal, and the problem has reduced quite a bit. certainly on
BBC1 and Ch 4 - I've got to steel myself before I watch the wife's
emmerdale, even in the interests of troubleshooting!

My understanding is that myth etc, just streams the data straight from the
card to disk, and does not perform any mucking about with codecs etc. If
it's not the signal, is it possible that it could  be an issue streaming the
data to disk?

Interestingly enough, the cable recordings play in the correct ratio on
mythtvplayer. I have the display aspect ratio set correctly in xorg.conf. If
I paly a recording with the force aspect ratio off, I get black bars down
each side of the display as if myth thinks it's 4:3, It fills the screen if
I set it to 16:9. I'll try and have a play about with mplayer to check the
flag, however I do have the apect set to 16:9 in the recording profile.

cheers

Gaz

On 06/05/07, Nick Morrott <knowledgejunkie at gmail.com> wrote:
>
> On 06/05/07, Gary Dawes <gary.dawes at gmail.com> wrote:
>
> > The first  problem is that I get picture corruption on the freeview
> signal
> > on the dvb-t tuners, it is really noticable on motion in the picture. I
> get
>
> Do you have deinterlacing enabled in your mythfrontend settings? We
> need to make sure you are not seeing interlacing artefacts (playback
> related) and are really seeing signal problems.
>
> > The second is with the pvr-150 which is hooked up to a cable box via
> > comp-video. the cable box is set to 16:9, the recording profile for the
> card
> > is set to 16:9. When I test the output from the box on the tv, it
> displays
> > 16:9, but  when I play any recordings or use live tv on that card it is
> 4:3
> > with black bars when I have no aspect ratio forced, freeview recordings
> are
> > 16:9. It is fine when I force the aspect, but I'd rather not do that as
> it
> > messes up the dvd playback. Any ideas?
>
> Make sure you have a widescreen DisplaySize in your xorg
> configuration. Is your cable box always outputting a widescreen signal
> with widescreen content? The BBC are notorious for outputting 4:3
> content on a 16:9 signal, so you will always see black bars if they
> are showing non-WS source material.
>
> If you have mplayer/ProjectX installed, you could make a test
> recording from the cable box (setting the aspect using
> ivtvctl/v4l2ctl) and make sure the widescreen 16:9 flag is being set
> correctly in the MPEG-2 video stream from your PVR-150.
>
> Nick
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