here what i have done more:
i updated my TMEGenc author from vers. 15.13.44 to 15.20.62.
but still same prb.
i then did something else interresting...
i went to open files from dvds files i have ripped with DVD Decrypter.
I tried again to use TMPEGenc author by opening files from several dvds (ripped by dvd decrypter) and i could see the audio.
apparently it can read audio1 Linear PCM, 48000HZ, 3ch
but it cant read audio1 dolbydigital (AC-3), 48000HZ, 3ch
i compared the 2 folders.
a movie ripped with dvd decrypter, contains just video_ts (wich tmpegenc author will read the audio later)
a movie ripped with dvd shrink (the one i want to author) contains audio_TS and video_TS
that is the prb...
I tried somehow to use dvd decrypter to ripp the movie with audio_TS and video_TS...but this program go automatically search my dvd player.
Is it possible to decrypt a folder with video+audio files? instead of a dvd in the dvd player...
if yes, how? if no, any idea how i could change the audio_TS in the correct format. (in linea PCM)
and how i will embed the final audio (PCM) in the video_TS folder in order to use it properly with tmpegenc author...
I hope you could understand what i have explained...

thx for ur time;)