This is what i do i capture avi at 480x360. sorry will do if its right
Thenframe server into tmpgenc 2.52 i choose the svcd templat for pal.
i make a few changes bitrate motion search etc etc
i chose aspect ratio 4:3 in video stream setting.480x576 size

Then i go to advanced setting tab and choose source aspect ratio 16:9
Then i go to clip frame and press the arrange seting button which adds the boarders i want and i leave aspect ratio as full scren keep aspect ratio
i end up with
INPUT 480x360 16:9
OUTPUT 480x576 4:3

BTW all soure material is 4:3 to start
is this all i need to do or have i got something wrong or have i missed something any input others might have would be great thanks