[mythtv] [mythtv-commits] Ticket #2649: Opengl video renderer

[Peter Schade]

Hello,
anyone tried this with an epia m-9000 board? Can the unichrome handle this?
And if, is it possible to show alpha transparency in the OSD? With Chromakey
there is none and otherwise the OSD is grey.

Bye Peter

----- Original Message ----- 
From: "MythTV" <mythtv at cvs.mythtv.org>
To: <mythtv-commits at mythtv.org>
Sent: Thursday, November 02, 2006 12:15 AM
Subject: [mythtv-commits] Ticket #2649: Opengl video renderer


#2649: Opengl video renderer
-----------------------------------------+----------------------------------
 Reporter:  mark_kendall at btinternet.com  |       Owner:  ijr
     Type:  enhancement                  |      Status:  new
 Priority:  minor                        |   Milestone:  unknown
Component:  mythtv                       |     Version:  head
 Severity:  medium                       |
-----------------------------------------+----------------------------------
 Video renderer using opengl for the mythtv-vid branch. Highlighs/lowlights
 include:-

 * Works with XGL
  - tested with XGL 7.0.0, Beryl 0.1.1 on Ubuntu 6.0.6 (Dapper).
  - but large(ish) performance penalty under xgl.
  - some window issues

 * Hardware yuv to rgb conversion
  - based on xine/glitz fragment program
  - uses rectangular textures when available
  - added colour adjustment as well (enable xv colour controls to use) -
 brightness, contrast, colour only (no hue).

 * Vertical sync
  - takes care of itself if opengl sync to vblank is enabled (nvidia-
 settings) and GPU can keep up
  - 'normal' opengl vsync will fail silently
  - better sync (less tearing) at 1080i when using buggy nvidia drivers
 (i.e. don't need to disable sync to vblank for xv)

 * PiP
  - hardware scaling of pip
  - pip sizing should be accurate for XrandR/aspect ratios etc
  - but pip is currently rendered over osd

 * XRandR
  - appears to be working pretty well (but see ticket:2648)

 * Performance
  - worse than xvideo but seems to be on par with mplayer/xine using opengl
  - FX5200 seems to cope with main video and pip at SD resolutions

 * EPG
  - preview EPG not currently supported

 * To do
  - if RGB OSD surfaces become available, hardware rendering of OSD
  - scaling of video resize for interactive tv - easy; but dependant on OSD
 above.
  - support for non YV12 picture formats (e.g. YUV422p, RGB24 - should be
 easy enough)
  - preview EPG if using opengl painter in mythui?
  - use QGLWidget for portability?
  - bobdeint - I've tried more approaches than I can remember. Doubling the
 refresh rate is easy enough but impacts so badly on texture sampling that
 you lose the fields. You end up with nothing more than a form of linear
 blend.

 You'll need to tweak your display profiles and use --override-setting
 UseOpenglVideo=1 (probably a short term hack) to get it working.

 Regards

 Mark

-- 
Ticket URL: <http://cvs.mythtv.org/trac/ticket/2649>
MythTV <http://www.mythtv.org/>
MythTV
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