[mythtv-users] Cropping with PVR-150
Brad DerManouelian
myth at dermanouelian.com
Thu Sep 25 17:10:19 UTC 2008
On Sep 25, 2008, at 9:59 AM, Jim Stichnoth wrote:
> I recently installed a Hauppauge PVR-150 to complement my two
> HDHomeRun boxes, with the s-video input connected to a DirecTiVo
> box. I have closed captioning enabled in the mythtv setup, which
> works great, except that the PVR-150 seems to be cropping around 10
> lines from the top, and inserting a horizontal black bar at the
> bottom. Doing "cat /dev/video > /tmp/foo.mpg" and then playing
> foo.mpg with xine or mplayer also shows the black bar (as well as a
> smaller vertical black bar on the left), and foo.mpg is at 720x480
> resolution.
>
> If I first execute "v4l2-ctl -b off", then the bottom black bar is
> no longer there in foo.mpg (though the small black bar on the left
> is the same). I'm guessing that the PVR-150 and/or ivtv are
> helpfully stripping the VBI information. But this is not really
> necessary since I already have global settings to deal with the
> flickering VBI line in the picture that the HDHR picks up from
> digital SD broadcasts.
>
> Is there a way to get rid of this bottom black bar and also keep
> closed captions?
>
> I'm running MythDora 5. I'm not quite sure how to figure out what
> version of ivtv I have.
It sounds like the black bar you're talking about IS the VBI
information, so you can't get rid of it and keep it at the same time. ;)
The solution is to set overscan when you play it back. I believe
industry standard is that TV is meant to be played back with 3%
overscan to crop out that stuff. Set that in your frontend and you'll
be viewing the program in its originally intended size.
-Brad
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