Ok i thinkt i found the issue:
The Subpicture Stream startet directly at the beginning of the Video. The Scenarist hardware simulation seems to have a problem to start directly with multiple subpictures.
I did another encoding with one second of black before the program and now it works.
When i try to start the simulation at a later part of the track that contains subtitles, the simulation doesn't work because of the bitrate problem again.
Thanks for listening
