When I put a mp4 with 3 audio tracks in Media Encoder, it encode with only the first audio track. Can you help me ?
I'm assuming that Media Encoder is converting all of the audio into a stereo mixdown. Are you trying to keep the three audio tracks seperated? May need a little more of an explanation to what you're trying to do and perhaps a screenshot of the Audio tab in your Export Settings dialogue window.
I'd like to combine the 3 audio tracks in one.
Here's the screenshot of my audio tab.