The error in Avidemux typically occurs because the software is strict about the formats it accepts for external audio. While Avidemux is an excellent tool for quick cutting and muxing, it is not a "universal" player and requires audio files to meet specific encoding and container standards to be used as a track. Common Causes for the Error
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: Ensure you are using the latest version (e.g., Avidemux 2.8.1 or newer), as some file handling bugs are fixed in nightly builds. avidemux+cannot+use+that+file+as+audio+track