Avidemux+cannot+use+that+file+as+audio+track -

: He remembered that Avidemux struggles with AAC/M4A or Ogg Vorbis files when they are added externally without being in a "raw" format (like ADTS-encapsulated AAC).

ffmpeg -i temp_video.mkv -i fixed_audio.wav -c:v copy -map 0:v:0 -map 1:a:0 -c:a aac -shortest final_video.mp4 avidemux+cannot+use+that+file+as+audio+track

This is the overwhelming cause of the error. Look at the main Avidemux window. On the left-hand sidebar, you’ll see a section labeled with a dropdown menu. : He remembered that Avidemux struggles with AAC/M4A

Avidemux sometimes struggles if the audio sample rate doesn't match standard video frequencies. Ensure your audio is set to or 48000 Hz . On the left-hand sidebar, you’ll see a section

: If you just need to "marry" an audio file to a video without re-encoding, MKVToolNix-GUI is often a faster, more flexible alternative that accepts most containers.

Files with heavy ID3 tags or embedded album art can confuse Avidemux's simple parser. Save a "clean" version of the audio without any metadata. Simple export tools often strip these automatically. 📂 Common Causes

If yes, the problem was a codec mismatch. You can now change Audio Output from PCM to Copy or MP3 and test again to find the optimal setting.