[mythtv] Video Output patch v13

[Daniel Kristjansson]

On Wed, 2005-04-20 at 21:43 +0100, Terry Barnaby wrote:
> Actually, going back to MythTv CVS 2005.04.14, it also uses quite a lot
> of CPU while displaying the small video in  "Watch Recordings", not
> quite the same level as with the patch (about 90% versis 98%).
> The picture does stutter, but the colours are correct.
> It appears that MythTv may be doing software decoding when displaying
> the small video in "Watch Recordings". It think it may have always
> done this from my original XvMC VLD implementation, but I am not sure ???
Yes MythTV uses software decoding for this, there is a "CPU friendly"
option in mythfrontend setup somewhere to slow down the framerate.
I believe this is in playbackbox.
Basically the loop is:
  Get a frame from the NVP
  Allocate a RBGA buffer the same size as the videoframe
  Convert the frame from yuv color space to rgb color space using MMX
  Release the frame back to the NVP
  Scale RGBA buffer it to the preview window size
  Create a QImage from the scaled image
  delete the RGBA buffer
  finally it draws the QImage.

This is very inefficient, but it should work.

BTW I'm not seeing this color issue, can you get me a screenshot?

Is MMX enabled? See the output of:
    cat ../config.mak | grep MMX

Also, are there any error messages?

-- Daniel