exporting very large files - playback problem
by tanner
on
Apr 30, 2007 at 10:27:41 pm
hey guys!
most of you probably heard of the new "red one" camera from "red digital cinema". in short: it's a super35mm chip camera. meaning shallow depth of field and 4k resolution - just to give you an idea.
i downloaded the mov file they posted on their website to show the cameras capabilities. 1920x1080. about 87mb. 11seconds in length.
i played around with the clip in after effects - just some color correction really.
i exported it as avi. for reasons i shall never understand...
anyways - first: the file became considerably bigger. 1.63gb.
second: it doesn't play back smoothly anymore and even stops half way through as if the computer couldn't handle the data anymore. although my system performance is sufficient - at least to my believe.
so - here's the question: why would converting a mov file into an avi become that much bigger?
and why would a computer with enough system performance have a problem just playing back a movie, even that large?
Re: exporting very large files - playback problem by epontius on May 1, 2007 at 12:31:37 am
.MOV files are just a container, same as .AVI. It's what you choose to put in that container that makes the difference. In this case the Red One sample Mov is compressed, they've used a Motion Jpeg codec to compress the video to something manageable.
The AVI file you created may have been created using no compression (aka uncompressed) which results in a LOT of data and video is at a specific frame rate to be fluid...far more than your system can handle unassisted. You're trying to drink from a fire hose rather than a garden hose...if you can keep up it's going to spill out.
Re: exporting very large files - playback problem by wuzelwazel on May 1, 2007 at 2:33:51 am
It doesn't decompress things, but it doesn't necessarily compress things either. If you import compressed footage and render it lossless then AE will output an uncompressed AVI/MOV at a very high data rate. It's sort of the same reason that a 1MB PSD rendered in a comp with a duration of 30 seconds at NTSC resolution will give you a 1.5+ GB AVI/MOV.
Re: exporting very large files - playback problem by epontius on May 1, 2007 at 2:39:13 am
In a way. When you exported the file after you made your adjustments, you exported it as an AVI file...You essentially had AE read every frame of your new adjusted video and create a new file that wasn't as compressed, not compressed as efficiently (different codecs compress differently with differing quality), or not compressed at all.
You could have exported the file as a MOV file using the Animation Codec or "None" and have a very big file as well.
