Its not possible to create a DVD with AC3 48KHz 5.1 Audio. The DVDs only has 2.0 Sound.
DVDStyler Version: 2.6beta (and earlier 2.5.4). System: Win 7.0 SP1 64bit.
Tested with following Input Audios : AAC(mp4/...),5.1, 44100 Hz. and AAC(mp4/...),Stereo,44100 Hz. ... Checkbox 5.1 is enabled, Language ist german. (Video was h264 NTSC1280x720 and Output is PAL 720:576)
I tested it also with DVDflick. There it works , also with upmix. Tested it with several constellations, it doesnt work with any....