The VideoLAN Forums

I searched this question and what I found was a number of posts that were specific to operating systems. So I'm going to ask here, I'm trying to convert an mp4 (from android taken with an app called coach's eye) to an mp4 just rotated 90 degrees, I got the filter working to keep the video rotated, but now it has no sound. What is the appropriate way to set up the SOUT audio to basically copy whatever the input file format (I assume it's AAC but not sure how to tell) is to the output file?

Look at your logs, they tell you why it fails.