[pwntr]

Hi all,

I just got myself a GT 720 (1GiB vRAM) to upgrade my aging HTPC (Athlon X2 260 @ 3.2 GHz, 8 GiB ECC RAM) for HD audio pass-through via HDMI. So far so good, HD audio works fine, video quality and scaling (also up to 4k) is great, all clear. CPU usage is low (~ 10-15 % per core for 1080p Blu-Rays), pressing “O” on the keyboard shows me that GPU acceleration is active (dc:h264_vdpau or something similar). But then I wanted to play around with native 4k material…

First of all, my Kodi settings itself should allow hardware acceleration. VDPAU is activated, MP4 acceleration with VDPAU as well, VAAPI is deactivated. Resolution in Kodi is set to [email protected] Hz, vsync is on. My a/v receiver confirms these input/output settings. The source material is all h/x264 encoded (Big Buck Bunny, Tears of Steel) but stutters badly. Hundreds of frames are being skipped or dropped in any case, CPU usage reaches 100% for one core, more than 50 % on the other. dc:h264_vdpau is still showing in the overlay menu, but it doesn't look like the system is being supported in the decoding process by the GPU at all.

I expected h/x265 material to stutter, but not the 264 stuff.

I tried both the latest stable and beta release (Kodi 15 RC2) of OpenElec, but no game with either one. Any thoughts on this? Is my hardware just too old or crappy to handle these kind of files?

Thanks a lot for your help!

[levi.baker88]

I know with 4k games you require in the vicinity of 6GB (at least) memory on the GPU (but games are considerably more intensive than a movie on a GPU). So your 1GB GT720 may be struggling a little and the CPU is picking up the slack.

I've never been an AMD CPU user so I don't know how old it is but that GPU is certainly aging. OpenELEC should have up to date drivers, probably make sure DXVA2 is enabled so that the GPU is taking most of the load.

[fritsch]

Post a Debug Log the 720 is by far enough to accelerate such files. Debug Log will reveal your issues.

[pwntr]

Post a Debug Log the 720 is by far enough to accelerate such files. Debug Log will reveal your issues.

Here's my log: http://xbmclogs.com/pcwytn0gj

Thanks for looking into this !

[fritsch]

It's 4k HEVC(!)

This is software accelerated. Only nvidia GTX 960 (2nd Gen) can do hw decoding of 4k content. So your CPU is doing the decoding ... nothing we can do - sorry.

[fritsch]

This file should work: http://distribution.bbb3d.renderfarming....normal.mp4

If you stream via network - try from local disk first. Make sure Scaling is not forced to Lanczso3 and even more important make sure you don't force Deinterlace to On - keep tha always on Auto.

[5ggggg]

Hallo, does anyone know if GT720 can hardware accelerate h.265 (HEVC) in the meantime - I guess it never will be https://de.wikipedia.org/wiki/Nvidia-Geforce-900-Serie ?!
It seems that the GPU must include the VP7 / GM206 chip (PureVideo HD 7). https://en.wikipedia.org/wiki/Nvidia_Pur...reVideo_HD

GeForce GTX 750 SE, GTX 950, GTX 960 GM206 | VP7 | F | January 2015 | Introduced dedicated HEVC video decoding (Main and Main 10) & dedicated VP9 video decoding

and I guess also thoose only support HEVC 8 Bit (10Bit hybrid).