Alternatively, you can mux the audio and video together directly in FFmpeg to bypass Avidemux entirely:
Avidemux is picky about the audio containers and codecs it accepts for multiplexing. Below are the most common causes and the steps to fix them. 🛠 Common Causes
This error occurs because when adding an external track . It cannot "demux" an external file if it is already inside a container (like .m4a or .mp4 ). 🛠️ Common Fixes avidemux cannot use that file as audio track
Fixing the "Avidemux Cannot Use That File as Audio Track" Error
Below is a guide explaining why this error occurs and how to fix it quickly. Why the Error Happens Alternatively, you can mux the audio and video
You have three practical paths:
However, many users encounter a roadblock when navigating to , clicking Add audio track , and choosing their file: they are hit with the frustrating error message: "Cannot use that file as audio track." It cannot "demux" an external file if it
might be supported for re-encoding internal tracks but cannot be imported as external files. avidemux.org How to Fix It
If your audio file was exported from software like Traktor, extra metadata at the beginning of the file can confuse Avidemux, causing it to misinterpret the audio headers and reject the file. Unsupported Codecs: