[mythtv] NVidia Pixellation

Aman Gupta aman at tmm1.net
Sun Aug 5 18:20:56 UTC 2018


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. =(

Aman


>
> These recordings play perfectly with software decoding, VAAPI, and *Raspberry
> Pi OpenMAX*. ($30 Raspberry Pi works better than Shield?!?).
>
> If you need a sample I can also provide one.
>
> Peter
>
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