I noticed that it is only possible to select the Minnetonka 5.1 surcode in the "H.264 Blu-ray" export format.
However, I would like to use the "H.264" export format (because I want to use the 50fps).
Is there any possibility to use the Minnetonka 5.1. Surcode in combination with this "H.264" 50 fps setting?
Sofar I couldn't find it.
Set multiplexing to none, then in the audio tab select Dolby Digital and then select Surcode.
Setting multiplexing to "none" was indeed the solution!
One thing to remember is that Encore will NOT allow you to monitor your DD 5.1 SS Audio stream in 5.1 - only as an emulated, stereo mix-down. Now, it will pass through the DD 5.1 SS to your BD, and all should be good - you just cannot monitor in Encore, except for that stereo emulation. All monitoring will need to be done in PrPro (or Audition, etc.).