You're trying to export 8 channel audio from a program that only will give you 2. AE is the visual part of your production. Multi Channel audio is produced in an audio app like Audition. Welcome to the world of double system audio where you work on audio with one system and picture with another.
The proper workflow would be to do all of your audio editing and conforming in Audition, cut your picture and rough out the audio in PPro, and do your visual effects, motion graphics and compositing in AE.
thanks for the reply, of course I do not have much experience in the field of television and the sound, I have not explained well. The question came about because the file format created by AE MxfOP1a actually contains 8 channels, but six are "empty". The file is not accepted by the system for the broadcast. Not necessarily have to create a new project but simply "transcode" a audio / video files existing (avi or mov). Seeking the solution with Encoder, Premiere or AE, are not the appropriate programs?
grazie per la risposta, ovviamente non ho molta esperienza nel campo della televisione e dell'audio; non mi sono spiegato bene. Il dubbio è nato perché il file creato da AE nel formato MxfOP1a effettivamente contiene 8 canali, ma 6 sono "vuoti". Il file non viene accettato dal sistema per la messa in onda. Non devo necessariamente creare un nuovo progetto ma semplicemente "trascodificare" un file audio/video esistente (avi o mov). Cerco la soluzione con Encoder, Premiere o AE, non sono i programmi adatti?
MXF has 8 audio channels. AE will only fill the first two. As I said before, if you want 8 channels filled you must use an app like Audition to create your sound track and marry that to the video.
MXF is not a usual delivery format for broadcast. Make sure that's what they want.