@Hellothar
I make some YouTube Videos in 1080p using Premiere Pro.
Example:
http://www.youtube.com/watch?v=X939y7KY418I use the following settings:
Sequence Preset > DVCPROHD > 1080p > DVCPROHD 1080p24
General
Editing mode: P2 1080i/1080p 60Hz DVCPROHD
Timebase: 23.976fps
Video Settings
Frame size: 1280h 1080v (1.5000)
Frame rate: 23.976 frames/second
Pixel Aspect Ratio: DVCPRO HD (1.5)
Fields: No Fields (Progressive Scan)
Audio Settings
Sample rate: 48000 samples/second
Default Sequence
Total video tracks: 3
Master track type: Stereo
Mono tracks: 4
Stereo tracks: 0
5.1 tracks: 0
Submix mono tracks: 0
Submix stereo tracks: 0
Submix 5.1 tracks: 0
When I Export I use the H.264 Format and HDTV 1080p29.97 High Quality preset
I think somewhere you might have to change the Width to 1920 and the height to 1080 but I cant find that right now. Hope that helps
Let me know if you have any other questions and I can do what I can to help