[vlc-devel] Meaning of video zoom

Rémi Denis-Courmont remi at remlab.net
Thu May 24 21:04:57 CEST 2018


If the SAR and PAR are equal, the meaning of zoom is clear: it is the ratio 
from input samples to output pixels.

But if they are not equal, according to what metric should the zoom be rated? 
I can think of 5 different dimensions to measure it, and they are probably 
- diagonale,
- largest,
- smallest,
- horizontal or
- vertical.
(Not to mention reorientation.)

I guess broadcasting industry reasons in vertical dimension, and display 
industry in diagonales.

N.B.: VLC has never measured the PAR to this point. Unless explicitly 
configured (--monitor-par), it is assumed 1:1.


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