Video in iframe ie9 bug size

Hello
I have a concern with the size of a video on ie9 , it is reduced then what should be 640/480 .
The size is respected on all browsers and on ie 7 . 8 . 10 .11 .

I even force size with css div class = " video- container" , nothing happens what do I do.

video- container iframe . ,
. video- container object ,
. embed video- container {
position : absolute;
top : 0;
left: 0 ;
width: 100% ;
height: 100 % ;
}

Searching I found a similar bug on another forum but no solution :

Thank you in advance.
Good start to the year