[mythtv-users] The Olympics has destroyed my video

Allen Edwards allen.p.edwards at gmail.com
Thu Feb 10 17:04:23 UTC 2022

On Thu, Feb 10, 2022 at 8:50 AM David Engel <david at istwok.net> wrote:

> On Thu, Feb 10, 2022 at 08:22:25AM -0800, Allen Edwards wrote:
> > My system dates back to my install of Mythbuntu 16 in 2018. With the help
> > of many in this group, I got it working well. It is an AMD 2.8GHz 5400
> > with 6GB memory and a GeForce GTX750 Ti video card. I am driving one of
> two
> > 1080 display which share a single output using a HDMI splitter.
> >
> > I was using VDPAU with 2 CPU set and Deblocking filter checked.Primary
> > deinterlacer is Advanced (2X,HW) and backup is 1X, HW.
> >
> > When there is fast motion, like a speed skater or ice skater, the picture
> > breaks up particularly around the athlete. This lasts for about 3 seconds
> > and basically makes it unwatchable. I have had to switch to SLIM and
> > with that I get artifacts I think are called tearing which annoy me but
> the
> > wife is happy so that is where it is.
> >
> > The artifacts are not in the source material and not due to the long
> cable
> > to the projector as I can see it on the TV and the projector.
> That sounds like the infamous, Nvidia, mpeg2 bug.  Are you seeing this
> only on your local, NBC station or on USA and CNBC too?  If it is the
> Nvidia bug, your only recourse is live with it or switch to one of the
> OpenGL profiles.  You might also need to increase the number of CPUs
> in the profile to 4.
> David

I see this on NBC which is 1080i but not on ABC which is 720p. I don't have
cable so do not get these other stations.

I only have 2 CPU cores.

VDPAU only is a problem if something is moving fast. There is no issue just
watching talking heads. It is actually reasonably rare but when it happens
it is very disturbing. I think on one of the 4 minute skating routines it
happened twice. But it is terrible. The tearing in SLIM, on the other hand,
happens all the time when anything moves but it is not terrible.

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