[pvrusb2] FAQ addendum for 4:3 recording resolutions

Mike Isely isely at isely.net
Tue Mar 13 09:00:36 CDT 2007

On Tue, 13 Mar 2007, roger wrote:

> Right. I'm recording with Mythtv.  Although recording at 720x480 on most
> channels, just on a few I get a noticable black bar on the right side.
> I finally found out lately via a brief search on google, 720x480 is not
> a true 4x3 (or 1.33:1) compatible resolution.  640x480 is.
> So I set Mythtv to record at a custom resolution at 640x480, and the
> black bar on the right side is gone.  I'm guessing this has to do with
> what kind of signal the broadcasting station is broadcasting and what
> Comcast does to convert it to an analog cable signal.  Most other
> channels such as Discovery don't appear to exhibit this except for maybe
> a thing black border on either the right or left side.
> Maybe you'll see this also on TVLand channel as well, because it's
> broadcasting some older show formats as well.
> Anyways, I can send Mike clippings, but I'm just going to kick back and
> relax and see what my recordings look like this friday when the same
> show is recorded at 640x480.. pretty sure it's providing a better
> picture.


I'd much rather you send me those clips.  Because if there is a real 
difference in the driver I'd like to at least try to track it down.  
You've asserted there is a problem in the driver here; I want to see the 
clips which show this.  I think the odds are much more likely you've got 
something strange going on in MythTV, but if that is the case then the 
samples (grabbed via "cat /dev/video0 >/tmp/foo1.mpg" or similar) should 
be fine.  On the other hand, if those clips demonstrate what you are 
talking about then I want to know.


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