[FFmpeg-user] why reducing the resolution a percentage doesn't reduce the video the same proportion?

Natalia Molinero Mingorance eng.nataliamolinero at gmail.com
Tue Mar 14 11:37:12 EET 2023

I'm using this command:

-y -r -i $inVideoUri -movflags faststart -c:v libx265 -s
$videoResolution -c:a copy -preset ultrafast  $outPutUri"

However, if "videoResolution" is a 50% of the original video resolution,
the resulting file size is not 50% of the original one. I assume there are
some headers or metadata added during the process but I would like to know
how to estimate the final video size.

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