Why is the audio lower in the resulting mp4 file than in premiere pro (pc)? And how to fix this. When I work on a video in Premiere Pro (any latest version), the audio is noticeably louder than the audio of the resulting file (MP4). In other words, the MP4 audio is at a much lower volume than the volume heard when working in Premiere. It wasn't always this way but it is now. Any idea what's wrong and how to fix it?