Compressing to a specific file size?

[toxicquack]

Hi Guys,

I am trying to upload some videos onto a video sharing site but they have to be a specific file size, no more than 50mb each. The clips I want to add from a recent project are big file sizes (clips at about 300mb each) is there any software out there that I can specify how big I want the file size to be when I compress the clips?

So if I wanted to make sure the clips were both 50mb, is there some mac based software I can use that will allow me to specify the exact file size? Hope this makes sense, thanks in advance!

[jman98]

Just some general advice as all my encoding experience is with Windows...

Some encoders do let you specify a final size. I know of some in Windows that do, but that's not helpful to you.

Another way to go is to use a bit rate calculator and input the length of your file in minutes and figure out what bit rate you'll need for a desired size. The upside of calculating the bit rate yourself is that you can use any encoder you like, including one that doesn't let you specify a final size.

[toxicquack]

Thanks for the reply Jman, its appreciated.

If anyone has any further help about an acutal application that would be great as I seem to randomly compress clips with various end results.

[jagabo]

file size = bitrate * running time

[toxicquack]

oh cool, thanks. I am using Quicktime Pro to export / compress the movie and it doesn't currently allow any input (as far as im aware)

[toxicquack]

I know that using Visual Hub and going to the advanced settings I can select "fit each video in __ mb" but when I do define an amount (such as 50mb) it doesnt stick to it and always goes over.

Any help is welcome!

[terryj]

in VisualHub tweak the following under advanced:

1. Frame Rate: cut it down from 29 or 24 to 15
2. Audio Hz: cut it down to 32000
3. Cut down the overal size: if it is 640 x 480, cut to 320 x 240,
if 320 x 240 cut down to 288 x 176.

that should do it.