Ok with some additional help from Linde, i found the settings that work more or less:
i used:
Save as type: Sony AVC/MVC
Template: HD 1920x1080-50p
custom settings are:
video format: AVC
Frame rate: 50.000 (Double PAL)
pixel aspect ratio: 1.000
Bitrate: 15'000'000 Kbit/s
Note that even though my camera produces 50i videos (25 frames per second), i rendered with 50fps. Changing the frame rate to "25.000 (PAL)" again led to frame overlap.
Still there were a few errors in some frames after uploading on youtube, so that i uploaded the video multiple times until it was perfect:
Freestyle Football - Summer 2011if you know another / better way, write it down below.