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Forums VEGAS Pro Render with CPU?

  • Render with CPU?

     Steve Rhoden updated 1 week, 6 days ago 5 Members · 8 Posts
  • Jono Grant

    September 8, 2020 at 10:21 pm

    Hi there, I’m rendering a music video with a cartoon (BCC) effect and many transitions/clips etc.. The 5 minute song took 15 hours to render yesterday! Ouch!

    Anyhow, someone asked if I was using only CPU to render which is set to use CPU by default in vegas.

    I have an Nvidia quadro p4000, should I render this differently?

    The options are: CPU, OpenCL or CUDA. Not sure what one to choose.

    Any idea?



  • Bernie Lademann

    September 8, 2020 at 11:13 pm

    Hi Jono,

    While I cannot tell you which way to go with your particular hardware, I can tell you what I have found with choosing the what to use. I have a machine which has Intel i9-9920X and 3 x Nvidia Quadro P4000 CPUs. I chose this hardware configuration because I use both Vegas Pro (for video) and Redshift (for 3D animation) in my daily work. I have found that there is very little difference in using the CPU and the GPU for render in Vegas on my machine, despite the fact that it has 3 GPUs!

    My suggestion is try a render test of a much shorter area in your project (10 seconds of video, for example) with the following (assuming you want to create MP4 files with h264 or h265 compression):

    Sony AVC

    Magix AVC – CPU


    Then pick the fastest one. The quality of the CPU renderer was once very poor with lots of artefacts, however, I cannot fault it in current versions of Vegas, so you can trust that the output will be good with either CPU or GPU.

    IMPORTANT: You must set the “Dynamic RAM Preview” to 0, in your settings. I guarantee that you will have a messed up output if this is set to anything other than 0. This is always been the case for me in all versions of Vegas I have ever used.

    Good Luck


  • Graham Bernard

    September 9, 2020 at 1:50 am

    This 10 Second using B Cartoon Look took 1minute 26 seconds:

    What I am noticing with BORIS that my GPU isn’t being used, all the demand is on CPU.

  • Graham Bernard

    September 9, 2020 at 2:29 am

    I’m doing a 5 minute of B Cartoon Look to a MAGIX 422 Intermediate MOV. No GPU option, that I can tell, and that’s estimating 40 minutes.

  • Jono Grant

    September 9, 2020 at 5:56 am

    I downloaded the CUDA toolkit and set the render settings to use CUDA if available.

    Now I see in windows task manager/performance that the GPU is taking a bit of the stress off the CPU. Not a lot mind you, but as you say, I guess the BCC plugin is more CPU intensive.

    I’ll inform about whether it was any faster once my render is complete.



  • Francois Pénzes

    September 9, 2020 at 12:20 pm

    Hi Jono

    I’m curious, have you tried rendering without the cartoon look. I’m asking because way back, I had a clip I was trying to render but it was taking way to long. I did test renders of the clip of only 1 minute and and for each one, removed 1 effect at a time to isolate what the culprit was. Can’t recall exactly what the problem was but I do remember that the culprit was not the one I expected.

    Cheers !

  • Jono Grant

    September 9, 2020 at 9:18 pm

    The cartoon effect is definitely the culprit. Without it, the file would render in a few minutes.

  • Steve Rhoden

    September 10, 2020 at 1:27 pm

    Jono, BCC Cartoon effect is the reason why your renders take so long. It is an extremely demanding system intensive filter!

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