[Feature Request] Estimated file size output

[mishmanners]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when I have to create multiple exports of the same thing because I can't get the file size right.

Describe the solution you'd like
What would be great, when we go to encode the file, it'd be great if there was an estimated size based on the parameters set. Ie. like what Adobe does when you export an image.

Describe alternatives you've considered
At the moment, I export up to 20 different files to get the correct size. Ie. to upload something to a blog or GitHub, 10MB is the file limit.