[mythtv] NVidia Pixellation

[Aman Gupta]

On Fri, Aug 31, 2018 at 8:33 AM David Engel <david at istwok.net> wrote:

> On Sun, Aug 05, 2018 at 02:41:03PM -0500, David Engel wrote:
> > On Sun, Aug 05, 2018 at 11:20:56AM -0700, Aman Gupta wrote:
> > > On Mon, Jul 30, 2018 at 2:41 PM Peter Bennett <pb.mythtv at gmail.com>
> wrote:
> > > > On 07/30/2018 04:26 PM, Aman Gupta wrote:
> > > >
> > > > Aman, do you have a good connection at Nvidia?  My local ABC station
> > > >> seems to have again started sending streams that show corruption
> when
> > > >> decoded with MediaCodec (and VDPAU, for that matter), but not when
> > > >> decoded with ffmpeg software.  I have a short sample that I can
> > > >> provide.
> > > >>
> > > >
> > > > Yes I can forward the bug report and sample if you email them to me.
> > > > Please test the sample with the latest Exoplayer and make sure it
> > > > reproduces there so they can investigate easily.
> > > >
> > > >
> > > >>
> > > >> I have a channel that has this problem. The local NBC station
> changed
> > > > hands at the beginning of 2017 and since then the stream gets
> periodic
> > > > pixellation but only on NVidia. The pixellations are at exactly the
> same
> > > > places on Shield as with VDPAU on my low-end, $20 NVidia cards.
> Apparently
> > > > NVidia are using the same (faulty) software in the Shield as they
> have used
> > > > for years in the low-end GEForce 210.
> > > >
> > >
> > > I hear back about my bug report. I forgot I had submitted a similar
> report
> > > several months ago as well. Apparently it's a known issue in the
> hardware
> > > and there's no software fix possible. Pretty disappointing. =(
> >
> > Yes, that's definitely disappointing.  Can they say what conditions
> > cause the problem?  I know the chances of anything changing are slim,
> > but perhaps we could pass the information on to our local TV stations.
> > I know I've seen the problem come and go in the past so it's something
> > they can control in their encoders.
>
> Aman,
>
> Have you had the chance to follow up on this?  I'd really like to
> report it to my local station.


I didn't get a clear answer: "has to do with motion vectors going outside
of some normal limit"


>
> David
> --
> David Engel
> david at istwok.net
>
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