The most reliable fix is to give Avidemux a file format it understands natively and flawlessly: or WAV (PCM) .
: Use a tool to strip metadata or "clean" the audio file by re-saving it in a basic audio editor. Unsupported Bit Depth or Codecs
If you suspect metadata is the issue, you can try "cleaning" the file by running it through a simple converter or a metadata stripper. Removing the first several bytes of a file that contains Traktor metadata has been known to fix rejection issues.
High bit-depth files (e.g., 32-bit WAV) can trigger errors; Avidemux generally prefers 16-bit or 24-bit WAV . Quick Fixes
The "Cannot use that file as audio track" error in Avidemux typically occurs because the software is highly restrictive about the and codecs it accepts for external audio streams . Core Reasons for the Error