How to diagnose
Here are some additional tips to help you work with audio files in Avidemux: avidemux cannot use that file as audio track
Avidemux operates on a principle by default. This means it tries to copy audio data directly from the source file (or external track) to the output without re-encoding. For this to work, the audio format must be compatible with the video container (MKV, MP4, AVI) you are using. How to diagnose Here are some additional tips
Ensure the audio file is not "Read Only" or being used by another program (like a media player) while you are trying to import it. 3. Use the "Add" Method via CLI (Advanced) select "Export as MP3
Open your audio file, select "Export as MP3," and ensure the "Bitrate Mode" is set to Constant .