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Compressing a FCP file

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Rachel Miller
Compressing a FCP file
on Jul 26, 2011 at 11:46:16 am

Hello,

I tried several times to compress a file that is 6 minutes and 33 seconds long. I changed the settings to 24 FPS and I changed the size to 853 x 480. The file is still too big. I've also tried to export it at a lower resolution using NTSC 720 x 480 16:9 and NTSC 720 X 480 4:3. I have kept the compressor quality slider at Best. I need the file to be no bigger than 250MB This has been a very difficult task. I am converting the file to a quicktime movie. This file is to be uploaded to a website.

Please advise.

Thanks,

Rachel


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Mark Spano
Re: Compressing a FCP file
on Jul 26, 2011 at 3:26:48 pm

Some math is in order to figure out what bit rate you should encode at to hit a size target. If your file needs to be (let's say) 200MB, then using H.264 compression, your total bit rate should be around 1500 kbps. I got that figure from this calculator:

here

Obviously you will have to test to make sure you hit the size, but it sounds about right to me.



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Craig Seeman
Re: Compressing a FCP file
on Jul 26, 2011 at 3:28:10 pm

Data rate controls file size for the most part.
Compressor's summary tab will show you the estimated file size per one hour so you'd have to do a little math to find the approximate file size. I generally find Compressor's estimate to be as much as 10-20% smaller than the resultant encode.

You should use a bitrate calculator.
http://www.pimley.net/projects/#bitratepro
or
http://itunes.apple.com/us/app/vidbitcalc/id447847515?mt=8



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