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eatChocolat
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Rendering is really slow on my new rMBP

Aug 7, 2012 3:32 PM

Hi everyone!

 

So I bought a new retina MacBook Pro with the following specs: Intel i7, 8GB Ram, 256 SSD HD and NVIDIA GT 650m 1GB

 

It's the first time I have a powerfull machine and when rendering some twixtor animation in AE, rendering goes pretty slowly. I mean it' s a £2000 laptop with pretty good specs, shouldn't it be faster? Anyway I can accept that issue to a certain level.

 

But if I drag my original clip in my composition (without any effects/modifications applied) and try to scroll through to see where to start my effects, it doesn't play the video at its original fps. Is that normal?

 

Are there any software options I can select to push for better performance?

 
Replies
  • Currently Being Moderated
    Aug 7, 2012 3:49 PM   in reply to eatChocolat

    There could be a lot of reasons why the render times are slow.  How slow are we talking?  Third Patry Plug-ins often take a long time to render.  Also After Effects never plays at the original fps without using the RAM Preview button.  Basically we need to know a lot more to help you.  Please provide answers to the questions listed here: "FAQ: What information should I provide when asking a question on this forum?"

     
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    Aug 8, 2012 10:06 AM   in reply to BenMarkus

    Or you'll usually have to do at least several spacebar previews of a clip before the frame rate will start to play back in realtime

     
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    Aug 9, 2012 6:59 AM   in reply to eatChocolat

    Just because you paid what seems to be a lot of money, does not mean you have a very powerful machine; it just means you spent money. As much as I love Apple products, I find them to be somewhat overpriced for the amount of power you get. Not to mention that a notebook computer, no matter the brand, is always far inferior to a desktop machine at the same price point.

     

    "Slow" is a relative term. Twixtor can be a pretty render-intensive effect. Is this slower with the same project on your MacBook Pro than it is on another machine or is this the first time you've tried it?

     

    Also, you didn't list your processor speed, but you don't really have a very powerful machine. I mean, it's probably pretty good for a notebook (although, a lot of processing power may go into running that cool display.) And I say "probably pretty good for a notebook" because you haven't even said how many cores your processor even has. The max you could have in the i7 is 4, but you might only have 2. I don't know the specs on the new MBP, but a professional motion graphics workstation is likely to have 8, 12, or more. What you get in any notebook can never compare to a proper desktop workstation.

     

    Yes; there may be settings you can tweak to make AE render quicker. Turn off multiprocessing and see if it's faster or slower. Then try tweaking some of the other settings in the memory and multiprocessing and testing. There are many factors that influence rendering speed and there is no "correct" setting in there.

     
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    Aug 9, 2012 7:27 AM   in reply to eatChocolat

    Twixtor is known to be a slower renderer due to the complex computations it does when creating frames.

     
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    Aug 9, 2012 2:41 PM   in reply to eatChocolat

    eatChocolat wrote:

     

    I'm just really supprised AE cant playback a clip at its orignal frame speed even tho the clip hasn't been modified

    That's because you're expecting AE to behave like a non-linear editor - which it isn't. An NLE is specifically designed to playback a video stream. After Effects (and Flame, Fusion, Shake, etc.) are all pixel-based image processing applications that behave very much like Photoshop. They calculate the values of every pixel in every frame, come up with a new pixel, and then play those pixels back.

    AE and all other pixel-based compositing apps, always work internally with completely uncompressed pixel data. NLE's rely on compression codecs and, in some cases, hardware, to playback the video.

     

    That's a really simplified version of what's going on under the hood, but I hope it makes sense.

     

    There is some more info on previewing here.

     
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  • Currently Being Moderated
    Aug 9, 2012 2:44 PM   in reply to eatChocolat

    How much slower is your new one than your old one when rendering the same clip with the same effects?

     
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    Aug 9, 2012 4:11 PM   in reply to eatChocolat

    Like I said, that is typical for Twixtor which is creating frames that never existed by interpolating info from existing frames. Probably the most time intensive process I know compared to all other plugins.

     
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    Aug 9, 2012 9:37 PM   in reply to eatChocolat

    I'm with Lasvideo here; that sounds fine.

     
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