thanks to everyone for their replies.

it is definitely vbi data. we have a local channel with no closed captioning, and it does not have that noise on top.

for some reason i could not get the crop filter to work in myth, but the vertical over/underscan feature worked great the first time!

-leith

Robert Brewer wrote:
I have this too on my system.  Various people say it is VBI (closed
captioning) data.  I think the pvr-150 driver doesn't cope with it
quite properly yet.  The way I deal with it right now is by activating
the following playback filter in mythTV:
  crop=1:0:0:0
This turns the topmost 16 pixels black during playback.  I don't miss
them, and it is less distracting to watch.

-Rob


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