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I'll do some further tests today and report back.

For reference my system is a 10900k @ 5.2ghz all core 32gb of CL14 4000mhz ram (not sure if very low latency or bandwidth plays the bigger factor here). Also works at x3 resolution in HDR.

The 4090 is mind blowing like x2 generational leap over my 3090. It so frugal on energy too!

EDIT----

Ok i've tested this further. Through MPlayer HDR works with Standard SVP interpolation (but not Rife). However since brining in all the new RIFE updates it seems to have broken HDR in MPV player. Even when using standard interpolation with Rife off MVP/SVP player is not playing HDR (even when turned off). I've even tested MPV on its own without SVP and it is not displaying HDR colours. I've posted my config file below for info:

Any ideas?

------------------
#
# THIS FILE WILL BE OVERWRITTEN WITH THE PACKAGE UPDATE
# Use %APPDATA%/mpv/mpv.conf
# OR SVP's menu -> Information -> Add. information -> mpv config. file
#     to define your own customized configuration
#
# Sample mpv configuration
#

# this is required for SVP to "catch" the mpv
input-ipc-server=mpvpipe

# hardware video decoder
hwdec=auto-copy
hwdec-codecs=all

# high quality video output, require rather fast video card
#profile=gpu-hq

# D3D11 renderer (default) is required for the HDR playback
#gpu-api=d3d11

# use VULKAN API if you have problems with the default d3d11 renderer
#gpu-api=vulkan

# miscellaneous options

# comment this one if you want mpv to remember the playback position
save-position-on-quit=yes

# fixes audio desync
hr-seek-framedrop=yes

#log-file=mpv.log
# this is required for SVP to "catch" the mpv
input-ipc-server=mpvpipe
hwdec=nvdec-copy
#hwdec=auto-copy

vo=gpu-next

-----------------

FINAL EDIT --- Adding this here incase anyone has the same issue. I needed to add the following to the config file:

--vo=gpu-next --target-colorspace-hint=yes --gpu-api=d3d11

The image clip you provided now plays at 50fps in HDR and looks fantastic.

One very happy camper here. Thanks everyone for your effors.

I've been a long time follower of the thread and now a very proud owner of a 4090. I can't wait to try out some 4K HDR RIFE!

Can you elaborate on point 3 or perhaps show a screen shot of your Application Settings window?

EDIT - Doesn't matter I sorted it. Patiently and excited waiting for the command line to finish

EDIT 2 - Got it working but need some assistance. My monitor is an ultrawide and the content i'm trying to watch is 21:9 it doesn't seem to zoom to fit like it does with the out of the box SVP player. Any ideas?

Should the window close after "Global timing cache in use. Profiling results in this builder pass will be stored." or keep waiting?

Yup i'm having no luck ether. I have the Dolby Vision plugin from the M$ store.

I've got the following version of MPV "mpv-x86_64-20220417-git-305332f" which I've copied (and overwritten where applicable) to the following location: C:\Program Files (x86)\SVP 4\mpv64

I've then accessed the MPV config file via Right click Information>Additional Information

My log file is as follows:

#
# THIS FILE WILL BE OVERWRITTEN WITH THE PACKAGE UPDATE
# Use %APPDATA%/mpv/mpv.conf
# OR SVP's menu -> Information -> Add. information -> mpv config. file
#     to define your own customized configuration
#
# Sample mpv configuration
#

# this is required for SVP to "catch" the mpv
input-ipc-server=mpvpipe

# hardware video decoder
hwdec=auto-copy
hwdec-codecs=all

# high quality video output, require rather fast video card
#profile=gpu-hq

# D3D11 renderer (default) is required for the HDR playback
#gpu-api=d3d11

# use VULKAN API if you have problems with the default d3d11 renderer
#gpu-api=vulkan

# miscellaneous options

# comment this one if you want mpv to remember the playback position
save-position-on-quit=yes

# fixes audio desync
hr-seek-framedrop=yes
ii

#log-file=mpv.log
# this is required for SVP to "catch" the mpv
input-ipc-server=mpvpipe
hwdec=nvdec-copy
#hwdec=auto-copy
hwdec-codecs=all
hr-seek-framedrop=no
vo=gpu-next
target-prim=bt.2020
target-trc=pq
gamma=5

Any ideas where i'm going wrong?

Monitor is in 10Bit HDR mode.

OK thanks I'll try some more with it.

Not trying to use plex as a player.

I can't seem to get GPU next to activate on mpv.