[mythtv-users] AMDGPU and VDPAU

[Tom Dexter]

On Wed, Apr 27, 2022 at 3:57 PM Martin Compton <martinc at itrans.com> wrote:
>
> On 4/27/22 11:08, Tom Dexter wrote:
> > On Wed, Apr 27, 2022 at 10:03 AM Martin Compton <martinc at itrans.com> wrote:
> >> On 4/6/22 16:49, Gregorio Gervasio Jr. wrote:
> >>> Yeah, my nVidia cards are even older so I switched away years ago.
> >>>
> >>> Two of my frontends use AMD Ryzen 3400G and 2400G APUs (CPUs with
> >>> integrated Radeon GPUs).  The playback profiles are set to use "VAAPI"
> >>> (not VDPAU) for the decoder and "OpenGL Hardware" for the renderer, and
> >>> that seems to work well.
> >>>
> >>> I haven't played much with the deinterlacing options since I don't
> >>> record any 1080i content these days ("Thanks, Comcast").
> >> I have a combo BE/FE with AMD Ryzen 7 5700G CPU/GPU Radeon graphics that
> >> I built late last year.  I set it to use VAAPI as that is listed as more
> >> broadly capable in MythTV FE System Status than VDPAU.  I have not
> >> noticed any issues with 1080i content (h.264 from an HDPVR), which all
> >> of my recordings use.
> >>
> >> It does seem to me that the picture is not quite as sharp as it was on
> >> my old machine (at 1080p60).  But without being able to specify the
> >> de-interlacer I'm not sure if it is related to that (or if it just my
> >> eyesight).  I drive the TV display at 4k p60 and like it overall.  Even
> >> if I used ffmpeg as the decoder, it doesn't put much load on the
> >> system.  Note that I am using the mesa driver's included in LINUX.  I
> >> have not tried installing the AMD GPU drivers.  I'm using Xubuntu 20 LTS.
> >>
> >> Remember that the AMD GPU uses system memory.  So the faster and more of
> >> it the better.  I've got 32Gb RAM and the GPU reserves 8GB.
> >>
> >> I've also noticed that MythTV FE starts using up RAM, upwards of 6-8GB
> >> over the course of days (using either ffmpeg or vaapi).  Not sure why it
> >> creeps up like that.
> >>
> >> Overall I have been pleased with the performance of the 5700G.  I really
> >> did not want to have to buy a separate video card and this CPU/GPU does
> >> the job nicely and was not a hassle to deal with in LINUX.
> >>
> >> Regards,
> >> Martin
> > Thanks for the reply! I'm a little confused as to what you're saying
> > about using RAM. Are you using the onboard GPU, or a separate video
> > card? I'm aware that the onboard cards use system RAM but didn't think
> > that was the case with a separate video card.
> >
> > The 1080i content I have is from OTA TV for the channels that don't
> > broadcast in 720p. That of course is all mpeg-2. It seems a little
> > surprising that the h264 from that HDPVR would be interlaced actually.
> >
> > When you say that you "drive the TV display at 4k" are you saying that
> > you're actually outputting 4k from the video card?
> >
> > Thanks in advance!
> > Tom
>
> I'm using the onboard GPU only.
>
> I'm using the component output of the cable box (spectrum).  Not sure
> why it comes out that way either.  1080i is what I have the STB
> configured to output, though.
>
> Yes, the GPU is outputting 4k to the TV via HDMI.  The only issue I've
> had is that for some reason it reverts to 30hz after the TV has been
> turned off.  Easy enough to set it back to 60hz though.
>
> Hope that helps clarify.
> MC
 Yes. Thanks for the clarification! Yea, next time around I'd really
like to get nVidia GPUs out of my life.

Thanks again!
Tom