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rendering fast forwarded video

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Veress Attila
rendering fast forwarded video
on Oct 20, 2009 at 6:40:00 pm

Hi im started to render a footage on 4x speed, but it renders so damn slow. Any way to speed it up or any other methods to speed up a video that doesnt make it render for days(im using time stretch)?


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Dave LaRonde
Re: rendering fast forwarded video
on Oct 20, 2009 at 7:13:41 pm

[Veress Attila] "Any way to speed it up or any other methods to speed up a video that doesnt make it render for days(im using time stretch)?"

  • Turn off Frame blending if it's on.
  • Don't use footage from an HDV camera... read o
n:
Dave's Stock Answer #1:

If the footage you imported into AE is any kind of the following -- footage in an HDV acquisition codec, MPEG1, MPEG2, mp4, m2t, H.261 or H.264 -- you need to convert it to a different codec.

These kinds of footage use temporal, or interframe compression. They have keyframes at regular intervals, containing complete frame information. However, the frames in between do NOT have complete information. Interframe codecs toss out duplicated information.

In order to maintain peak rendering efficiency, AE needs complete information for each and every frame. But because these kinds of footage contain only partial information, AE freaks out, resulting in a wide variety of problems.


Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Dave Johnson
Re: rendering fast forwarded video
on Oct 21, 2009 at 2:31:08 pm

It depends entirely on your needs ...

What I mean is that AE often generates noticeably better quality results with playback rate adjusted footage, but it often does take significantly longer than doing the same in video editing software (i.e., FCP, Premiere, Vegas, etc.). So, if you're footage is for 320x240 on YouTube, consider doing the time shift in your NLE, but if it's for HD broadcast TV ... well, I'm sure you get the idea.

If you are going to do it in AE, you might test small segments of your footage using each of the 3 frame blending options (including off, as Dave suggests since blending is more useful for slo-mo) ... depending on the particular footage, both the quality of the result and the render time can be significantly different so you might want to make sure the result will be acceptable before committing to what can be a very lengthy render.


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