Can someone tell me how to replace audio in a mp4?

Hi - I have several mp4s, and I keep getting an error of “invalid medium, filetype not supported” everytime I go to replace audio in vid file. I have tried:

aif: 441/24, 441/16, 48/24, 48/16
wav: 441/24, 441/16, 48/24, 48/16

Every single one of those files gives me the aforementioned error. Any ideas?


MP4 uses AAC for audio.


Ah - that would explain it. Thanks. :slight_smile:

Ok, how do I make an AAC file? No option in the audio export window; nothing in the manual.

AFAIK Adobe Premier will do it, don’t know about Steinberg products unfortunately.