why are a 4k and HD export the same file size?

Forum|Forum|7 years ago
November 20, 2018
1 reply
6564 views

im exporting a short film in 4k and HD

and it appears that the size is more or less exactly the same regardless of the resolution

on the other hand if i increase or decrease the bit depth, it has a dramatic effect on the file size

why is this?

i would have imagined that a 4k file would logically be bigger than a HD file

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My Trucking Skills

Inspiring

what are the dimensions of the HD file?

D

djmattyzAuthor

Inspiring

1920 x 1080

vs

3840 x 2160

R Neil Haugen

Legend

oh right, sorry i was talking about bit rate, not bit depth

but premiere defaults to a bit rate of 10 regardless of weather im exporting at 4k or HD

so you are saying that i should manually increase it for higher resolutions, which i did by the way, (to 20)and it seems to look better

but how do i know what is the ideal bit rate for any given video if premiere doesnt do it automatically?

There's no way PrPro can "know" what is the best bitrate for any particular media which is heavily a user-decided choice. Are you needing small file size? Is there a lot of motion needing a high bit-rate for most of the project? Is there very little motion so the project can go in a rather small bit-rate average but with a high setting for max bitrate?

It can't out-think you. As a pro app, that's your job. It's very easy to search online for best bitrates for different video export uses. You can get some good guidelines quick, then ... test. Always test to make sure something works the way you want it to.

Neil

Everyone's mileage always varies ...

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