How to change aspect ratio

[prolland]

Dear,
In order to capture in firefox, a dvd, how can I do to change aspect ratio.

<embed type="application/x-vlc-plugin"
name="video1"
autoplay="yes"
autostart="yes"
loop="yes"
width="1900" height="1000"
target="dshow:// :dshow-vdev="" :dshow-adev="" :dshow-size="" "
"/>

I have tried set_str_varaible, and like this thread I have an error;
viewtopic.php?t=15651&highlight=aspect

Do you have an idea ?

Best regards.