thanks for the info now i look at it

search in the file domoticz.js
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original line:

var AspectSource = 4 / 3 ;

modified line:

var AspectSource = 16 / 9 ;
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or another desired aspect ratio.
By modifying this variable it is possible to ...

Most HD cameras are 16/9 or similar in size, I mean not all are 4/3 "AspectSource".
I wanted to propose adding a box to the configurations to be able to vary this "AspectSource"

that appears in the line 1677 of the file domoticz.js
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original line ...