-
exporting very large files – playback problem
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. 1920×1080. 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?thanx in advance guys!
tanner
-
6 Replies
-
.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.Erik
-
[epontius] “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.”
Wow, I was going to post a similar response… but I don’t think any of my analogies would’ve been that good =O
-
thanx eric!
but how is it possible for a file to become that much bigger? i mean – i didn’t change either length, nor size of the comp.
does after effects decompress stuff without me knowing it…?
tanner
-
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.
-
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.Erik
-
realy guys – thanx!
i get the picture now…
tanner
Reply to this Discussion! Login or Sign Up