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Rescaling an HD video to lessen weight on ram?

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Khaled MagdyRescaling an HD video to lessen weight on ram?
by on Apr 17, 2010 at 7:42:00 pm

Ok me and my freinds were shooting with an HD camera, so the videos are huge, but in the end they will be scalled to look small on a 720p video, so even when i rescale AE still goes slowly, how can i cut the resolution?


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Joe MoyaRe: Rescaling an HD video to lessen weight on ram?
by on Apr 17, 2010 at 8:29:11 pm

Reduction of HD video can reduce the quality...

A better approach would be to work with a proxy... you will decrease the the demands on your system but the final results would have HD quality... therefore, you can export in any format video size.

Look up tutorials regarding proxies for more info...


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Khaled MagdyRe: Rescaling an HD video to lessen weight on ram?
by on Apr 19, 2010 at 9:17:35 pm

i will look up proxies but if it doesnt work out (ummm 2gbs of ram) and i need to do the vid in one day. how can i find out the codec of the HDV and how do i convert it?


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Dave LaRondeRe: Rescaling an HD video to lessen weight on ram?
by on Apr 19, 2010 at 9:43:03 pm

Apple's Compressor, Adobe Media Encoder or a third-party encoder like Sorenson Squeeze will all work. So will Quicktime Pro.

Make sure you encode to a lossless codec; HDV is very lossy, so you want to preserve as much quality as possible.

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


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Dave LaRondeRe: Rescaling an HD video to lessen weight on ram?
by on Apr 19, 2010 at 4:49:17 pm

[Khaled Magdy] "e and my freinds were shooting with an HD camera... even when i rescale AE still goes slowly"

It could also be the type of HDV footage you shot:

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, AVCHD, mp4, mts, 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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