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

[Natalia Molinero Mingorance]

yes, I removed the "-r", sorry. but, by reducing the resolution, the size
is also reduced somehow proportionally.

El mar, 14 mar 2023 a las 13:31, Michael Koch (<astroelectronic at t-online.de>)
escribió:

> Am 14.03.2023 um 10:37 schrieb Natalia Molinero Mingorance:
> > 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.
>
> You can control the size of the output file by either using the -q:v
> option or by specifying the video bitrate with the -b:v option.
>
> By the way, I don't understand the purpose of the -r option in your
> command line. Shoudn't that give an error message if it's not folllowed
> by a value?
>
> Michael
>
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