[mythtv] Ticket #4872: Detect if video is letterboxed and switch to corect fill mode

Mårten Bohlin mabo at mochc.net
Tue Apr 1 07:48:37 UTC 2008

On Mon, Mar 31, 2008 at 3:49 PM, Willy Boyd <willyboyd at gmail.com> wrote:
> On Sun, Mar 30, 2008 at 3:07 AM, Petr Stehlik <pstehlik at sophics.cz> wrote:
>  > Mårten Bohlin píše v St 26. 03. 2008 v 10:21 +0100:
>  >
>  > > Since this patch seems to work very well. So I have uploaded a "final"
>  >  > version to the ticket now. This version is the same as version 6 but
>  >  > all debug code has been removed.
>  >  >
>  >  > Does anybody has any suggestion of any other issue that I could have a
>  >  > look at now?
>  >
>  >  For me, the "default zoom: half" does not work as expected because it is
>  >  zooming even contents that would fit perfectly on screen without any
>  >  black bars - i.e. 16:9 movie on 16:9 screen is zoomed as well. The
>  >  default zoom should IMHO zoom to half (if enabled) only if the movie is
>  >  4:3 and screen is 16:9 (not sure about 16:9 movie on 4:3 screen).
>  >
>  >  Petr
>  >
>  I thought that "half" only specified how much to zoom?  Even if the
>  video is 4:3, it may be displaying a 16:9 movie or show with the black
>  bars encoded into the stream.  Zooming in on this is what this feature
>  enables.
Yes it it makes a half or a full zoom depending on the size of the
bars. But you can also select to get some overscanning for 4:3 content
if you want to.

>  I've been running this since last week and it seems to be pretty
>  solid.  The only remaining issue I might have is that it would be nice
>  to be able to disable it for DVDs.  We were watching a movie this
>  weekend, Dan in Real Life I believe, and I think it was a anamorphic
>  2.35:1 ratio video.  In other words it was widescreen, but still with
>  a small bit of black bar at the top and bottom of the screen.  This
>  triggered the auto-fill to kick in.  Easy enough to change with the
>  OSD menu, so it's only a minor annoyance.  I'm picky about movies and
>  almost always want those in the original aspect with no "overscan".
>  In fact this might be what the poster above was talking about so I'm
>  sorry if I didn't get that :)

I am interested in what happened in this case, since the auto
detection should disengage itself if the video is not in 4:3 format.
So which version of the patch are you using?
And do you still have the DVD so you could run with it with the verbose flag?

mythfrontend -v playback

You only have to watch the movie until you can see the error. And then
send the output to me.


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