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

[Mårten Bohlin]

On Wed, Mar 19, 2008 at 2:14 PM, Daniel Kristjansson
<danielk at cuymedia.net> wrote:
>
> On Wed, 2008-03-19 at 13:32 +0100, Mårten Bohlin wrote:
>  > On Wed, Mar 19, 2008 at 12:20 PM, Doug Larrick <doug at parkercat.org> wrote:
>  > > Mårten Bohlin wrote:
>  > >  > Yes "2" means "XVMC_IDCT_MPEG2". Unfortunately I do not know how all
>  > >  > that stuff works.
>  > >  >
>  > >  > Could anybody tell me if it is possible to analyze a decoded frame
>  > >  > when you run XvMC? And if that is possible where should I look for the
>  > >  > decoded frame?
>  > >
>  > >  No, I'm afraid MythTV has no access to the decoded frame when using
>  > >  XvMC.  The decoding takes place on the video card into its own memory.
>  > >  For the same reason, the deinterlacers available when using XvMC are
>  > >  severely limited.
>  > >
>  > >  -Doug
>  > >
>  >
>  > OK. So this is another argument that this detection should be done
>  > together with commercial detection when possible.
>  >
>  > But I do not have the time to do that now.
>
>  Marten, yes detection during commercial detection would work with
>  more video renders. DVDV and XvMC frames in particular can not be
>  pulled from video RAM efficiently (when it is possible at all).
>
>  But I think if the kinks are worked out detection at the playback
>  stage is valuable in itself. Many MythTV features are only available
>  with some of the Video Renderers, and sometimes only with specific
>  hardware.
>
>  Also, if the code is clean and well compartmentalized it makes it
>  easier to add support for it in the commercial detector later on.
>
>  -- Daniel

Yes I agree that it is still useful. I will wait a week or so to see
if there is any issues with my latest version. If everything seems OK
I will make a final version without some debug code that is still in
there.

Mårten