hardware acceleration for video decode?

[teridon]

Is Reaper supposed to use hardware acceleration for video decoding? As far as I can tell, it is not doing so on either of the two computers I tested it on. (Reaper 6.78/win64)

When I try to edit video in reaper, the performance for playing or scrubbing through the video is, well, abysmal. I've tried both the default ffmpeg included in Reaper, and the ffmpeg from https://github.com/GyanD/codexffmpeg/releases/tag/4.4.1 (specifically, the shared build, installed in UserPlugins)

I've also tried vlc as the decoder, but currently I'm using Video decoder priority: "ffmpeg, vlc".

I can see in the Windows Task Manager, both on the Processes tab, and the Performance tab for the GPU that there is NO GPU Video Decode. In contrast, when I scrub through a video in another video editor (in this case, Camtasia, but even in the Microsoft Photos editor it uses video decode).







Here is the video item properties:


Video decoder info:

	This version of REAPER supports video decoding/playback via:
	
	• wmf: Windows Media Foundation: Windows Vista+ only, no additional download required
	• qt: Quicktime: (bridged to 32-bit), Quicktime must be installed
	• ffmpeg: FFmpeg/libav: minimal build included with REAPER, v2.8-v4.2 can be downloaded separately for more functionality
	• vlc: VLC media player: v2.x-v3.x for correct architecture must be downloaded separately
	• dshow_depr: DirectShow: deprecated, not recommended
	
	For each imported media file, REAPER will try the available decoders in the priority order listed in Preferences. Append :ext or :ext1,ext2 or :!ext to limit decoders to a specific media file extensions. For example, vlc:mov will try the VLC decoder only for .mov files; ffmpeg:!wmv will try the FFmpeg decoder for files other than .wmv.
	
	Using output: DirectShow EVR
	Current video frame: 2160x3840 'YV12' #49
	
	Available decoder information:
	
	========== Windows Media Foundation ==========
	Windows Media Foundation v2 decoder/encoder available
	
	========== VLC ==========
	VLC v3.0.x
	Loaded from: C:\Program Files\VideoLAN\VLC
	
	========== ffmpeg/libav ==========
	ffmpeg/libav DLL decoder v58.134.100
	
	Loaded from: C:\Users\teridon\AppData\Roaming\REAPER\UserPlugins\avcodec-58.dll
	ffmpeg/libav configuration:
	  --enable-gpl
	  --enable-version3
	  --enable-shared
	  --disable-w32threads
	  --disable-autodetect
	  --enable-fontconfig
	  --enable-iconv
	  --enable-gnutls
	  --enable-libxml2
	  --enable-gmp
	  --enable-lzma
	  --enable-libsnappy
	  --enable-zlib
	  --enable-librist
	  --enable-libsrt
	  --enable-libssh
	  --enable-libzmq
	  --enable-avisynth
	  --enable-libbluray
	  --enable-libcaca
	  --enable-sdl2
	  --enable-libdav1d
	  --enable-libzvbi
	  --enable-librav1e
	  --enable-libsvtav1
	  --enable-libwebp
	  --enable-libx264
	  --enable-libx265
	  --enable-libxvid
	  --enable-libaom
	  --enable-libopenjpeg
	  --enable-libvpx
	  --enable-libass
	  --enable-frei0r
	  --enable-libfreetype
	  --enable-libfribidi
	  --enable-libvidstab
	  --enable-libvmaf
	  --enable-libzimg
	  --enable-amf
	  --enable-cuda-llvm
	  --enable-cuvid
	  --enable-ffnvcodec
	  --enable-nvdec
	  --enable-nvenc
	  --enable-d3d11va
	  --enable-dxva2
	  --enable-libmfx
	  --enable-libglslang
	  --enable-vulkan
	  --enable-opencl
	  --enable-libcdio
	  --enable-libgme
	  --enable-libmodplug
	  --enable-libopenmpt
	  --enable-libopencore-amrwb
	  --enable-libmp3lame
	  --enable-libshine
	  --enable-libtheora
	  --enable-libtwolame
	  --enable-libvo-amrwbenc
	  --enable-libilbc
	  --enable-libgsm
	  --enable-libopencore-amrnb
	  --enable-libopus
	  --enable-libspeex
	  --enable-libvorbis
	  --enable-ladspa
	  --enable-libbs2b
	  --enable-libflite
	  --enable-libmysofa
	  --enable-librubberband
	  --enable-libsoxr
	  --enable-chromaprint
	
	ffmpeg/libav search path:
	  %PATH%
	  C:\Program Files\REAPER (x64)
	  C:\Users\teridon\AppData\Roaming\REAPER\UserPlugins\64
	  C:\Users\teridon\AppData\Roaming\REAPER\UserPlugins
	  C:\Program Files\REAPER (x64)\Plugins
	
	========== DirectShow (deprecated) ==========
DirectShow available (but deprecated)

ffprobe on the video file:

	Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PXL_20221022_154347357.mp4':
	  Metadata:
	    major_brand     : isom
	    minor_version   : 131072
	    compatible_brands: isomiso2mp41
	    creation_time   : 2022-10-22T15:44:27.000000Z
	    com.android.capture.fps: 30.000000
	  Duration: 00:00:37.12, start: 0.000000, bitrate: 43858 kb/s
	  Stream #0:0[0x1](eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)
	    Metadata:
	      creation_time   : 2022-10-22T15:44:27.000000Z
	      handler_name    : SoundHandle
	      vendor_id       : [0][0][0][0]
	  Stream #0:1[0x2](eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, smpte170m/bt470bg/smpte170m), 3840x2160, 43663 kb/s, SAR 1:1 DAR 16:9, 29.74 fps, 30 tbr, 90k
	 tbn (default)
	    Metadata:
	      creation_time   : 2022-10-22T15:44:27.000000Z
	      handler_name    : VideoHandle
	      vendor_id       : [0][0][0][0]
	    Side data:
	      displaymatrix: rotation of -90.00 degrees