'link' — Avidemux+cannot+use+that+file+as+audio+track

(fastest fix) Use ffmpeg (or Audacity) to convert the audio to WAV (16-bit PCM) or AC3 . FFmpeg command: ffmpeg -i input_audio.m4a -c:a pcm_s16le output_audio.wav Then load the WAV file in Avidemux → Audio → Select Track → External Track.

With trembling fingers, he loaded the stripped file. He clicked "Open." avidemux+cannot+use+that+file+as+audio+track

The error message "Cannot use that file as audio track" in Avidemux typically occurs because the software cannot decode the specific audio format or the file lacks a valid header for external synchronization. (fastest fix) Use ffmpeg (or Audacity) to convert

Avidemux has a complex history with AAC audio due to licensing issues. While it can often play AAC audio inside a video file, it may struggle to import a standalone AAC/M4A file as an external track if the specific internal decoder isn't loaded. He clicked "Open

ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac output.mp4 : Keeps the video quality identical.

Use File > Open to load your main video file. Do not add the external audio first.

The error message vanished. The jazz track synced perfectly with the flickering film grain on his screen. With a final click of , the project was no longer a collection of incompatible parts—it was a story. New user getting "Cannot use that file as audio track"