Skip to main content
C
cole-paciano
Participant
October 25, 2019
Question

After resizing, cropping and exporting video it's the same file size as original

  • October 25, 2019
  • 2 replies
  • 246 views

Hello,
I have a source video of around 55MB.  I import it into Premiere, make all my edits, open the Sequence Settings and chang the Frame Size to a custom size (412x869).  Then I use the crop filter to remove the unwanted portions of the video for this frame size.  I then export the video using the H.264 format.  For some reason though, it generates a file with the same file size as the original.  I've searched, with no luck, to try and understand and/or figure out why it's not smaller in size since there are dramatically less pixels involved at this lower frame size.  Any idea what's happening or how to fix this?

 

Thanks!

Cole

    This topic has been closed for replies.

    2 replies

    R Neil Haugen
    R Neil Haugen
    Legend
    October 25, 2019

    Frame size has nothing to do with export size. Bitrate-per-second controls the file size. Period. That's what bitrate per second means ... file size per second.

     

    Larger or smaller frame-sizes affect how much the data-rate ... bit-rate ... needs to be adjusted to keep a decent visual quality. Larger framesizes require higher bitrates per second, therefore large files, to keep a certain visual level of detail.

     

    But a 6k two minute long file exported at 100Mbps will have the same file size as a 960x540 of the same settings and at 100M/bps.

     

    Because either way, it's a 2 minute file times 100Mbps.

     

    Neil

    Everyone's mileage always varies ...
    R Neil Haugen
    R Neil Haugen
    Legend
    October 25, 2019

    Video file sizes are determined by the bit-rate per second. That's the total amount of data written into the file per second, which isn't at all dependent upon or affected by the frame-size.

     

    Second, most format/codecs require numbers divisible by at least two if not four as far as framesize goes. That is a very intriguing choice you made there ...

     

    Neil

    Everyone's mileage always varies ...
    C
    cole-pacianoAuthor
    Participant
    October 25, 2019

    Hi Neil,

    Yeah, I'm sure I'm doing something wrong here.  That custom frame size was chosen to correspond to a screen width for the background of a responsive webpage (the idea being that I would load/display a smaller-sized video for mobile devices).  It seems odd to me that after removing about two thirds of the original frame size, the newly exported file would be about the same file size as the original.  I would think that by removing all those extra pixels and frame data the resultant file would be significantly smaller than the original. It's almost as if it's retaining all the cropped area somehow.

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices