Thanks for your Info.

What i do is:
Edior: Premiere Pro
Framereate: 50P
BitRate 50MBit/s
The Timeline is 16 Min.23", the outputfile is XXX.mp4 and the Outputfile is 5.8GB. When I work with a Bitrate 8MBit/s the Video plays, but not with a BitRate 50MBit/s

Pablo