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

Mark Buechler mark.buechler at gmail.com
Wed Jan 24 14:31:05 UTC 2007


Mark, this patch looks very interesting indeed. I'd like to test it with my
5700, however, I'm not certain it's fast enough. I don't use any
deinterlacers and I often watch 1080i content on a 1080i screen.

In your estimation, what is the minimum NVidia card required for 1080i HD
without any deinterlacers? Specifically, I'm interested in the OpenGL OSD.

Thanks, Mark.

On 1/24/07, MythTV <mythtv at cvs.mythtv.org> wrote:
>
> #2649: Opengl video renderer
>
> -----------------------------------------+----------------------------------
> Reporter:  mark_kendall at btinternet.com  |        Owner:  danielk
>      Type:  enhancement                  |       Status:  new
> Priority:  minor                        |    Milestone:  unknown
> Component:  mythtv                       |      Version:  head
> Severity:  medium                       |   Resolution:
>
> -----------------------------------------+----------------------------------
> Comment (by mark_kendall at btinternet.com):
>
> Version 2 of the OpenGL renderer(substantially re-written).
>
> * Major changes
>      * Implements a simple, multipass filtering structure utilising
> multiple framebuffer objects and/or multiple fragment programs.
>      * Includes opengl versions of each of the existing deinterlacers
> (onefield, kernel, linearblend, bob) (N.B. these will deinterlace normal
> softblend osd)
>      * Adds 3 new progressive scan versions of onefield, linearblend and
> kerneldeint
>      * Mix and match software and opengl deinterlacers for main/fallback
> deinterlacers.
>      * Adds an opengl rendered OSD. This uses the existing YUV osd frame
> and alpha mask but does utilise the full screen size and resolution.
>      * Software yuv2rgb fallback if fragment programs are not available on
> the graphics hardware.
>      * Added a seperate opengl class to handle the window/context and all
> opengl resources (textures, fragment programs, framebuffers and 'non-
> standard' function calls)
>      * Resizing of interactive tv is now handled in hardware if using the
> opengl osd.
>
> * Issues
>      * Xrandr support is at least partially broken.
>      * Some deinterlacers assume topfield first field ordering.
>      * Small off-by-one rendering innacuracies of interactive tv(MHEG)
> when
> using opengl osd.
>
> * Performance/quality
>      * NVidia 62XX series seems to be about the minimum needed for
> standard
> definition progressive scan (using progressive kerneldeint - which is by
> far the most GPU hungry) (FX5200 cannot cope with more then basic opengl
> deinterlacing)
>      * NVidia 7600GS copes well with SD main video, pip and opengl osd
> rendered at 720P
>      * Quality of the progressive scan deinterlacers is pretty good. They
> cope very well with low to moderate movement but less well with fast
> motion. (Also seem to handle frame rate discrepancies better than bobdeint
> - eg PAL at 60Hz)
>      * If the GPU cannot handle the demands, CPU utilisation seems to go
> through the roof...
>
> * To Do
>      * Additional filters (lanczos and/or kaiser, denoise) - needs some
> upstream intergration (also need some help with lanczos)
>      * More advanced deinterlacers (I've started to look at edge
> detection)
>      * Framerate conversions e.g. PAL to NTSC rates
>      * Performance improvements (minimise opengl state changes, does pip
> need deinterlacing)
>      * Offscreen rendering for use by preview pip (ie hardware color
> conversion and scaling) and maybe transcode?
>
> --
> Ticket URL: <http://cvs.mythtv.org/trac/ticket/2649#comment:2>
> MythTV <http://www.mythtv.org/>
> MythTV
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