[mythtv-users] NVDEC: is there something wrong with it?

James Abernathy jfabernathy at gmail.com
Fri Nov 13 15:14:32 UTC 2020

On Tue, Nov 10, 2020 at 10:43 AM Greg Oliver <oliver.greg at gmail.com> wrote:

> On Tue, Nov 10, 2020 at 8:28 AM Jim Abernathy <jfabernathy at gmail.com>
> wrote:
>> I just put together a new workstation where I will be watching TV with
>> Mythtv-frontend when not using it for other things.
>> It's a 6 core Ryzen 5 3600 with a Nvidia GT-1030 fanless GFX card.
>> After the initial install of mythtv-frontend I started playing videos
>> with the default settings of NVDEC.  That worked fine on HD 1080i
>> content but when I tried a sub-channel where the video was 720x480 at 30, I
>> immediately noticed that the video paused and played every few seconds
>> and never got better.
>> When I changed the video profile to High Quality OpenGL it worked
>> perfectly on all video types.
>> So I'll leave it that way, but why would NVDEC be so bad on 480i content??
>> Jim A
> Possibly the same MPEG issue that have plagued other cards too...?
> I've been testing further and I find that High Quality OpenGL is very good
on my system; however, if I'm watching a program that has a text crawl at
the bottom (new, sports) that over time the crawl becomes jittery. This is
on HD 1080i programs. I have not seen that with an NVDEC profile. NVDEC
will definitely not play a 720x480 at 30 program so I use OpenGL for that.

So is there a way to switch between profiles with a keyboard shortcut? I
have not found one yet. Now I have to use Setup to do this.

Jim A
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