[mythtv-users] Current generation low-power graphics card to use for 4K TV (both MythTV frontent and content)

Mark Kendall mark.kendall at gmail.com
Mon Feb 1 09:27:54 UTC 2021


On Mon, 1 Feb 2021 at 08:11, Stephen Worthington
<stephen_agent at jsw.gen.nz> wrote:
> For (relatively) low power, try looking for fanless cards, such as the
> Nvidia GT1030s.  I am not sure how good their 4k support is as I do
> not have a 4k TV yet, but they do have at least basic 4k support.

As Stephen has said, I think the GT1030 is about the minimum for good
NVDEC decoding coverage (if you are looking to the future and moving
away from VDPAU), it is more than powerful enough and isn't a power
hungry monster. (I use one myself for testing). Older cards will
probably give you adequate decoding of just H264/MPEG2 (either with
VDPAU or NVDEC) if you are just looking for handling broadcast
material.

In terms of discrete cards, any more recent AMD card is probably more
than capable as well, is better supported under linux but they don't
seem to do small, low power cards like Nvidia (I'm using an RX 460
atm). I also use the integrated GPU with an AMD 3400G (VEGA 11?) and
that is more than capable. (Both work well with VAAPI but VDPAU does
not currently work with MythTV - not sure why).

Intel wise, any CPU with integrated graphics from Coffee Lake onwards
will give you good hardware video decoding coverage, though I'm not so
sure how well the older models would cope with running the UI at 4K.

The biggest issue I've found with 4K support is not the resolution but
the framerate - you need to check carefully whether your
TV/GPU/Motherboard  combination will support 60fps at 4K (I got caught
out with my Intel CoffeeLake motherboard).

Looking to what might be of interest in the future:-

 - I'm just testing GSync (Nvidia) and FreeSync (AMD) support in
master - both of which work well (DisplayPort connections only)
 - HDR support is coming along (looks like only AMD and some SoCs) -
I'm getting my displays to enable HDR but can't turn it off at the
moment.
 - there is ongoing work to enable DRM video rendering and the new
V4L2 request API - so fingers crossed the Pi4, for example, will be a
much more capable option for 0.32 (improved H264 handling and HEVC 4k
as well)

Regards
Mark


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