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  • Time warp slow render

  • therman mermehn

    August 30, 2020 at 6:44 pm

    I’m using after effects to timewarp footage (no other effects or changes) and it’s very slow to render.

    Checking the CPU , GPU , RAM , and drive usage , my machine is barely showing any percentage of usage across all components. (for ref: dual socket xeon / 24gb ram / gtx1060 / two sata ssds raid 0

    Both windows 7 and 10 , along with AE 2015 and current show the same issue on the same machine.

    To be more specific , the footage is 10 minutes long (i’m gonna keep it this long for now just as a base line thats easy to diagnose)
    It’s a standard def file , I’ve tried both mp4 and even Lossless as I heard compression can be a problem.
    Neither file type changes how the render behaves.

    The file when rendering will start off very quick , almost rendering close to real time , but as the render continues it gets slower and slower and the estimated time remaining gets longer and longer. The first minute of footage is rendered in about 1 and a half minutes. The remaining 8 and a half minutes is estimated to take several hours.

    None of the pc components show anything that would indicate one of them being a bottleneck for this render. I even tried changing to amount of ram that AE has access to down to a single gb of ram just to see if the problem was at all related to memory and it had no effect on the render.

    The only thing I’m noticing that is suspect….. is that one or two cores on the cpu seem much busier than others which leads me to believe that AE cannot actually use more than a single core when rendering the timewarp effect.

    So far my only “band aid” solutions for this problem are running multiple instances of AE so several renders of different sections can be done at once. This seems very in efficient.

    Or another solution was to break the file into 10 1 minute long sections and render each separately…. opening AE , rendering 1 minute , then closing AE and reopening it and rendering another minute. this is also horribly in efficient.

    Any ideas?

  • Richard Garabedain

    September 1, 2020 at 2:52 pm

    after effects has a hard time with longer clips. and 10 mintues is very long in AE. Have you tried rendering to a png sequence instead of movie files. then output that as a single movie. I think it will help.

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