<div dir="ltr"><br><br><div class="gmail_quote">On Wed, Oct 1, 2008 at 2:40 PM, Jim Stichnoth <span dir="ltr"><<a href="mailto:stichnot@gmail.com">stichnot@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div dir="ltr">On Thu, Sep 25, 2008 at 9:59 AM, Jim Stichnoth <span dir="ltr"><<a href="mailto:stichnot@gmail.com" target="_blank">stichnot@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div dir="ltr">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.<br>
<br>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.<br>
<br>Is there a way to get rid of this bottom black bar and also keep closed captions?<br><br>I'm running MythDora 5. I'm not quite sure how to figure out what version of ivtv I have.<br><br>Jim<br></div>
</blockquote></div><br>I took a couple of screen shots to show the problem more clearly. I paused the
input source (an SD DirecTiVo), then ran either "v4l2-ctl -b cc" or
"v4l2-ctl -b off" to turn closed captioning on or off, and then
captured a frame using xine. If you flip back and forth between the
two images, it's clear that the first several lines are being cropped
and everything shifted up when cc is enabled. It's also interesting
that even with the uncropped picture, the VBI stuff has apparently
already been removed. If I had to guess, I would say that VBI removal
is being done twice when cc is on. (I would prefer that VBI were not
removed at all, so that MythTV overscan or whatever could be applied
consistently to all inputs.)<br><br>cc on: <a href="http://www.flickr.com/photos/37377999@N00/2905480460/sizes/o/" target="_blank">http://www.flickr.com/photos/37377999@N00/2905480460/sizes/o/</a><br>cc off: <a href="http://www.flickr.com/photos/37377999@N00/2905480878/sizes/o/" target="_blank">http://www.flickr.com/photos/37377999@N00/2905480878/sizes/o/</a><br>
<br>Any ideas on this?<br><br>On a barely related note, I was also
experiencing the PVR-150 "tinny audio" problem on many recordings, but
the various tweaks suggested on mailing lists weren't fixing it. (I
was trying to add the extra commands to my channel changing script.) I
finally realized that mythtv doesn't start capturing from the PVR-150
until after the channel change script completes. The solution was to
run a background command from the channel change script that delays a
few seconds and then executes the command. In my bash script, the last
line is this:<br>
( sleep 5; v4l2-ctl --set-audio-input 1 -d /dev/video0 > /dev/null 2>&1 ) &<br>I'm sure there's something similar for people using perl scripts.<br><br>Jim<br></div>
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<br></blockquote></div><br><br>What is the "tinny audio" problem? I have a PVR150 and get a wierd little sound that I don't quite know how to describe, on certain channels, wondering if this is what you're talking about.<br>
<br>Thanks<br>Bob<br></div>