Popper playfield media aspect ratio

[pcfixhenning]

I will just explain what my situation and see if anyone can help me?

 

I recently decided to put MAME on my Vpin cabinet so I could play some old arcade games, I've got everything working with popper but the media for the playfield is the wrong aspect ratio, if I just play the video in media player it is correct, but in popper it is compressed top to bottom, what i did initially was loaded a bunch of games at once to MAME, the to make media easier I downloaded a media file pack, so I wouldn't have to go through each game and record it, initially all the playfield videos in the media pack were rotated 90 degrees off because pinball playfields are rotated, so I used a program to batch rotate all the videos, now the orientation is correct but as I stated the aspect ratio is off, there mut be a way in popper to adjust this but I haven't found it yet, thanks for any help given.