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

Stephen Worthington stephen_agent at jsw.gen.nz
Fri Nov 13 15:27:27 UTC 2020

On Fri, 13 Nov 2020 10:14:32 -0500, you wrote:

>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

You should be able to set up playback profiles to match specific frame
sizes and frame rates.  Create a new profile and add a new entry under
that profile.  Fill in the width and height range and frame rate range

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