The error in Avidemux typically occurs because the software has strict requirements for external audio streams . Unlike standard media players, Avidemux often expects "raw" audio streams rather than audio already wrapped in another container like .m4a or .mp4 . Core Causes for the Error
The most reliable fix is to convert your audio file into a format Avidemux natively accepts using a tool like Audacity or VLC. avidemux cannot use that file as audio track
Avidemux does not support .m4a as an external track because it is a container, not a raw stream. The error in Avidemux typically occurs because the
Avidemux might have issues with certain sampling rates or bit depths. Avidemux does not support
By systematically checking these potential causes and applying the suggested solutions, you should be able to resolve the issue with using your audio file in Avidemux.
Once you have a compatible raw file, follow these steps to add it: Cannot use mp3 as audio track - avidemux.org
Avidemux’s internal architecture does not use its full demuxer (the part that opens video containers) when adding an external audio track. Instead, it looks for a direct, raw stream. avidemux.org Unsupported Containers : Files like