Windows 10: Slow performance video editing VirtualDub Solved

  1. spapakons's Avatar
    Posts : 2,455
    Windows 10 Pro 64-bit 1803 (April 2018 build 17134.48)
       15 Dec 2016 #1

    Slow performance video editing VirtualDub


    I have a Core-i3 (see my specs) running Windows 10 Pro v1607. I usually edit HD 1080p video at a rate of 6-7fps. Yesterday I started a new edit using nothing more than the usual filters (Deinterlace, Crop, Resize) I use every time but the rendering rate is about 1-2fps. Do you have any idea what is going on? Could a Windows Update (such as graphics driver) affect performance? If you have any suggestion please tell me what you suspect so I can find the culprit and fix it. For the editing I am using VirtualDub 32-bit (so I can use all the 32-bit codecs), video compression is x264vfw plugin and audio compression is AC3 using AC3ACM.

    Any help appreciated.

    PS: I have an SSD as my system disk but due to some recent downloads the free available space is about 20GB. Could that affect performance?

    EDIT: I think I found something! The NVidia acceleration settings were all reset to default (prefer quality etc). I changed them to best performance, changed PhysX to Auto (it was CPU) and some other settings and the rendering speed in Virtualdub improved from 1-2fps to 4-5fps. Any other suggestion is welcome.
      My ComputerSystem Spec

  2. spapakons's Avatar
    Posts : 2,455
    Windows 10 Pro 64-bit 1803 (April 2018 build 17134.48)
    Thread Starter
       17 Dec 2016 #2

    OK, I did it. I enabled DirectX Video Acceleration (dvxa) in VirtualDub, I then went to NVidia Control Panel and changed all 3D settings towards maximum performance. Now is back to normal. Probably some NVidia driver update had restored the default settings (quality) and affected performance. Pity there is no CUDA plugin for VirtualDub. This would skyrocket performance...
      My ComputerSystem Spec


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