[mythtv-users] Another Nvidia Question / Problem

[glen]

On 09/30/2013 07:28 AM, Michael T. Dean wrote:
> On 09/29/2013 09:13 PM, glen wrote:
>> Having had deinterlacing issues as per my previous thread, i switched 
>> my card to a gt640. Playback is fine in 1080i content. I noticed 
>> really bad artifacts playing 720p content (hd homerun atsc high 
>> bitrate). After trying a lot of things, i changed the profile to 
>> normal ffmpeg and the problem resolved, so it was the vdpau playback 
>> (not interlaced). I then tried to use the opengl rendering to reduce 
>> cpu.
>
> FWIW, the OpenGL renderer is probably the most-CPU-intensive renderer 
> you can choose.  Xv and VDPAU rendering are the least-CPU-intensive 
> renderers, and likely require similar amounts of CPU, though the VDPAU 
> renderer is by far the best renderer available and the Xv renderer is 
> by far the worst.
>
>> When that was used i got only 3/4 of the picture. Switching in 
>> Appearance settings to uncheck separate gui and playback I then got a 
>> full picture.
>
>>
>> 1. Is there a way to resolve the artifacts using vdpau. In my 
>> xorg.conf is disable composite, triple buffers and dpi 100x100 (to 
>> get a normal desktop). this is under latest mythbuntu using nvidia 
>> 319 updates. I get the problem using other nvidia drivers, and the 
>> xorg settings when removed don't change anything. I have powermizer 
>> set to performance. Changing that does not change anything either.
>>
>> Also i tried an xorg.conf where i disabled the edid info and set 
>> modelines. same issue.
>
> In my experience, the VDPAU decoder is /very/ sensitive to 
> corruption/issues in the video encoding it receives.  It is far less 
> resilient than the ffmpeg decoder.
>
> What I've done is set the decoder to ffmpeg and the renderer to 
> VDPAU.  This works great, gives me very-forgiving-of-the-video 
> decoding, and gives me the benefits of VDPAU rendering (including 
> "full screen" OSD (versus scaled-from-video-size) and access to VDPAU 
> deinterlacers, etc.)
>
>> 2. is there a way to resolve the opengl issue so that i can have 
>> separate gui and playback to go to 24 frame on the TV ?
>
> It sounds like your X is "changing" resolution, but not changing the 
> output signal--i.e. if you took a mouse and moved it down and right, 
> it would "scroll" the display to show the bottom-right 3/4 of the 
> video.  If so, this is something misconfigured outside of anMythTV.
>
> Mike

Thanks Mike. on the opengl it was showing only 3/4 vertical top quarter 
of screen was empty. using standard decode and vdpau render it is same 
cpu % as opengl render. i think nvidia does the opengl on the gpu. your 
idea to use standard and vdpau is better. again this is only on 720p. so 
deinterlace not an issue. did not notice the artifacts until sunday 
football on fox (720p), other shows no problem. i will try again next 
sunday and this time save a recording. it may be that the change from 
separate gui from playback would have corrected that as well. i think 
the tv has a lot to do with this. in 1080i when i turned off the motion 
engine the playback became perfect and fast motion perfect, with the 
automotion on, it was choppy. it is samsung 2011 d630 40 inch.
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