DVD Ripper How does CUDA GPU acceleration work?

[WebMaximus]

Looking at the information under the 'Processing' column when ripping a title it says CUDA GPU acceleration for video decodin and CUDA GPU acceleration for video encodin

However when I check my GPU utilization it never goes over 7% usage. I have a GTX Titan card.

How is this CUDA GPU acceleration supposed to work because I guess I should see a much higher GPU utilization value if my GPU indeed was used to accelerate the encoding and decoding?

[WebMaximus]

Would still like to know this.

[signals]

A good indicator is to look at the CPU utilization, if it is very high, then the GPU is not doing much work. DVDFab performs a GPU check when first started and writes it to the internal log file. Please locate and attach a log from a recent version of DVDFab that shows the GPU check, it will help determine what DVDFab has found and is trying to use. It sounds like your settings are correct. Could be an issue with the nvidia driver.

[WebMaximus]

This is what my latest logfile looks like and as far as I can tell GPU acceleration is enabled so that's why I wonder why the GPU util isn't higher during a ripping process.

Not sure if it was mentioned in the logfile somewhere already but I'm using a fresh install of the latest Nvidia drivers (353.30)

DVDFab 9.2.0.2 (2015/07/13  22:54:11)

 0m 00.03s: Init Public log : enabled.
 0m 00.03s: Init Private log : finish.
 0m 00.03s: App info: 2015-6-10
 0m 00.03s: App info: 9.2.0.2 9202 Official
 0m 00.03s: Init CrashReportSettings : enabled.
 0m 00.03s: Init DVDInfo_Log : enabled.
 0m 00.03s: Init Qt_Log : disabled.
 0m 00.07s: Profile Manager :: Begin Load Profile 
 0m 00.07s: Qt Translator file load success 
 0m 00.07s: App info: client type 2.
 0m 00.08s: MobilePlay load: preload successful.
 0m 00.12s: MobilePlay load: Load successful.
 0m 00.12s: Init process: Transfer settings successful.
 0m 00.12s: info: check logpath= C:/Users/Richard/Documents/DVDFab9/Log/
 0m 00.13s: info: _check_gpu is running ...
 0m 00.24s: info: check_gpu run successful 
 0m 00.24s: info: recommand= 56, Shrink support= 0, enable= 0, cuda_cap= 1 , cpu_count= 4
 0m 00.24s: GPU check: GPUAccelerate-4159
 0m 00.24s: GPU check: GPUAccelerate setting-56, 56
 0m 00.24s: GPU check: CUDA cap-1
 0m 00.24s: GPU check: Support coreavc decode-0
 0m 00.24s: GPU check: Lighting shrink status-0, 0
 0m 00.24s: GPU check: Graphics info 1: NVIDIA GeForce GTX 980 Ti : 10.18.13.5330 : 5.2
 0m 00.25s: Init process: Load config successful.
 0m 00.25s: Init process: Windows os type is 64bit System Windows 7.
 0m 00.25s: Init process: command line in is "G:\"
 0m 00.25s: bTimeoutReturn=0
 0m 00.25s: Init process: there is another app running and exit.
 0m 00.47s: Profile Manager :: End Load Profile 
55m 21.90s: got agid 0
55m 21.93s: sent host cert chal
55m 21.94s: got drive cert chal
55m 21.94s: BEC 1
55m 21.94s: DRIVE_VENDOR 0x0074
55m 21.99s: got drive key
55m 21.99s: got host key signature
55m 21.99s: verified drive signature
55m 21.99s: verified host signature
55m 22.04s: sent host signature and key point
55m 22.04s: got bus key
55m 24.90s: D CD1F2757
55m 24.90s: got vuk
55m 25.22s: got unit key 1
55m 30.44s: got bdmv
55m 34.86s: got extended bdinfo
55m 34.86s: opened blu-ray
55m 35.27s: Source manager: open successful.
55m 35.38s: Work manager: create Converter work 1 with source 1 and uiinfo 1( title 100 ).
55m 35.69s: ========WorkAttr::SetSource=======
55m 35.69s: Source Video Size Original : 1920 x 1080 
55m 35.69s: Source Video Size Display : 1920 x 1080 
55m 35.69s: Source Video FPS : 24000 / 1001 
55m 35.69s: Source Video Bitrate : 1200 
55m 35.69s: Source Audio Bitrate : 0 
55m 35.69s: Source Audio Channels : 8 
55m 35.69s: Source Audio Volume : 100 
55m 35.69s: Work Profile : AVI 
55m 46.24s: UILog:OnMsgToolbar_Start
55m 46.24s: UILog:Msg Start : ready start
55m 46.24s: UILog:Msg Start : start test run work
55m 46.26s: UILog:Msg Start : run work
55m 46.26s: UILog:Run current Work.
55m 46.26s: UILog:Begin work Converter.
55m 46.26s: UILog:Begin work copy or converter.
55m 46.26s: Start check Blu-ray Ripper (3D Plus) register status.
55m 46.26s: End check Blu-ray Ripper (3D Plus) register status: Enable
55m 46.26s: UILog:start running at thread.
55m 46.26s: UILog:return flag at start running at thread ok.
55m 46.27s: OPList at BD Converter : (4113.2),(4352.4),(4616.8)
55m 46.27s: Blu-ray Converter (3D Plus) check watermark flag: 0
55m 46.27s: ------------------  convert work begin(1/1)  ------------------ 
55m 46.27s: start process(1/1)
55m 46.27s: info: create config(bluray2video)
55m 46.27s: info: crop value after clone: left = 0 right= 0 top=0 bottom=0 enable=0 mode=0
55m 46.28s: info: use profile(AVI)
55m 46.28s: info: bluray playlist(100),angle(0),chapter(1->12),BDAV(no)
55m 46.28s: info: 3D working_mode(disable), 3D format(sbs_lef_right) 
55m 46.28s: info: stream input@ Video(4113)[codec(h264) size(1920*1080) fps(24000/1001) interlace(0) duration(6284)sec opcode(compress)]
55m 46.28s: info: perset file config OK ! 
55m 46.28s: info: set output video frame_rate(24000/1001)
55m 46.28s: info: stream output Video(4113)[codec(h264) size(1920*1080) fps(24000/1001) interlace(0) bitrate(4972) duration(6284)sec]
55m 46.29s: info: stream input@ Audio(4352)[codec(dca) channels(8) sample(48000) bitrate(0) bitdepth(24) opcode(remove_hd)]
55m 46.29s: info: stream output Audio(4352)[codec(dca) channels(8) sample(48000) bitrate(0) bitdepth(24) opcode(remove_hd)]
55m 46.29s: info: stream input@ SubPicture(4616)[codec(pgssub) language(Swedish) opcode(render)]
55m 46.29s: info: SubMode(Render) -- Display Only forced Subtitle(false) 
55m 46.29s: UILog:MsgWork:WorkStatus_Start
55m 46.29s: CUDA GPU acceleration for video decoding enabled
55m 46.35s: info: ex process path= C:/Program Files (x86)/DVDFab 9/fabcore.exe
55m 46.38s: info: h264_encode: encode param profile(1) level(40) bitrate(4972) crf(-1) interlace(0)
55m 46.38s: info: connect to sub render filter success. 
55m 46.39s: info: processing source(00109.m2ts) 
95m 26.52s: info: bluray read data end
95m 32.66s: ------------------  convert work finished  ------------------
95m 33.66s: UILog:MsgWork:current work finish : 3
95m 38.06s: UILog:Run Work to end.
95m 38.22s: DriveX msg: remove media in driveX G.
95m 38.45s: Source manager:open source flag:1,0,1,1,1
98m 57.40s: Warning : Null Data at Work
98m 59.42s: Source manager:open source flag:1,1,1,1,1
99m 03.99s: Exit process: stop running.
99m 03.99s: Exit process: preview pfn_releaseplayer end
99m 04.02s: Exit process: preview pfn_deinit end
99m 04.02s: Exit process: preview FreeLibrary end
99m 04.02s: Exit process: finish MainUI.
99m 04.05s: Exit process: finish FreePref.
99m 04.05s: Exit process: finish AVEditWrap Release.

[Nik_Simpson]

Not sure you have a problem

The encoding and decoding isn't that tough for the GPU. The decoding part is less work than it would have to do to actually play the Bluray on the display, because it's rendering to a virtual framebuffer and not having to think about things like screen resolution, overlapping windows etc.
The encoding is a bit more work, but not much. I'm sitting here working on my desktop while ripping a Bluray at 90+ Fps with Intel Quicksync and there is no discernible impact on performance.
If you are ripping from the BluRay Disc, then the limiting factor seems to be how fast data can be read & decrypted from the Bluray. You can see that's the limitation by first ripping the entire disc structure to a hard drive and then ripping the movie from there, you'll significantly higher framerates.

[WebMaximus]

Ok, good to know.

Just wanted to make sure my GPU is utilized in the best possible way.