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Brief RAM Previews in After Effects CS3

Posted on 2011-02-15
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Last Modified: 2012-06-27
I've got a recent Mac Pro with 6GB of memory running After Effects CS3, but my Ram previews are quite brief.

In one sequence, I managed to get about ten seconds of Ram preview.  But when I duplicated that sequence and made a minor tweak, then tried to Ram Preview it, I only got half a second's worth of preview.  

It seems odd that it's not using up the memory that was used in the earlier sequence and allocating it to the newer sequence, (the green bar still shows ten seconds worth of preview time on the older sequence).

What am I doing wrong?

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Question by:mrwizzer
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Author Comment

by:mrwizzer
ID: 34902607
Side note:  I'm also getting the following error message:

After Effects error:  unable to allocate space for a 1400 x 900 image buffer.  you may be experiencing fragmentation.  In the Memory & Cache Preferences dialog box, try decreasing the Maximum RAM cachce size value and selecting the Enable Disk Cache option, increasing Maximum Memory Usage, or both.
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Expert Comment

by:Merete
ID: 34931604
Have you seen this one
After Effects error: unable to allocate space for a 1440 x 1080 image buffer.

http://forums.creativecow.net/thread/2/924799
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Author Comment

by:mrwizzer
ID: 34934447
Yes, but thanks for pointing that out.

I've found that by disconnecting the 32" LCD Television that I've been monitoring on lately, the errors seem to have gone away.

I'm wondering if I need a new graphics card to be able to push video to both my Apple Cinema monitor AND a 32" LCD TV via the displayport output.   It's a brand new Mac Pro, I wouldn't have thought I'd have needed more horsepower than what I've got.  But maybe I'm wrong?
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Expert Comment

by:Merete
ID: 34935243
Yes that is very possible, the TV uses a diiferent Hz refresh rate than computer monitors > Apple Cinema monitor
The best Monitors these days are all LED so there's really no need to use a LCD TV
I dont believe the video card is the problem here
but rather using the LCD TV with your Apple Cinema Monitor, I don't have a great deal experience with Apple Mac, but do know something of the requirements for running 2 displays from one card,
Are you using  HDMI to DVI cable?
you say>32" LCD TV via the displayport output.
May explain the error
unable to allocate space for a 1400 x 900 image buffer<<
Here's a couple of testamonials using this setup
quote
The iMac can support external displays up to the resolution of 1920x1200 this includes all LCD TV's and others alike but not any 30" computer monitor such as the Apple Cinema displays.
http://forums.whirlpool.net.au/archive/1015476
http://discussions.info.apple.com/message.jspa?messageID=8899723

Do you get sore eyes using the LCD TV up close?
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Author Comment

by:mrwizzer
ID: 34938222
Thanks for your reponse, Merete.  

The reason I'm using the LCD TV is that I'm creating video for this specific TV, (it's part of a high-tech Halloween prop I'm creating).  

And yes, I'm using a Mini DisplayPort Male to HDMI Male 32AWG Cable - 15ft .  




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Accepted Solution

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Merete earned 500 total points
ID: 34940342
Sounds fun.
are you trying to play from the video timeline?
If I may I'll just offer some tips I sourced on Adobe,
Some factors that influence the speed with which previews are rendered include layer switches, Fast Previews settings, preference settings, and composition settings.
RAM preview allocates RAM to play video and audio in the Timeline, Layer, or Footage panel at real-time speed. The number of frames that can be stored for real-time playback depends on the amount of RAM available to the application and the settings in the Preview panel.
Note: If you are using the Render Multiple Frames Simultaneously multiprocessing feature, the duration of a RAM preview depends on the amount of memory available to the foreground application. See Memory & Multiprocessing preferences.
Source
Use RAM preview to play video and audio
http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7ec9a.html
And this one
From Current Time
Select From Current Time to play from the current time; otherwise, RAM Preview plays the work area from the beginning of the composition, layer, or footage item."
what is RAM prview ? how it works.
http://en.allexperts.com/q/Animation-3158/RAM-preview.htm

And yotuube just about anything we need these days can be found on yotube
Ram Preview
http://www.google.com.au/search?q=Ram+preview&hl=en&rlz=1T4GGLL_enAU394AU394&prmd=ivnsfd&source=univ&tbs=vid:1&tbo=u&sa=X&ei=5-lhTdGxE4jZcdOftcUJ&ved=0CEQQqwQ
Hope it assists you a little
Regards Merete
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