Avidemux Cannot: Use That File As Audio Track |link|

Alternatively, you can mux the audio and video together directly in FFmpeg to bypass Avidemux entirely:

ffmpeg -i input_audio.m4a -acodec copy -absf adts output_audio.aac Use code with caution. avidemux cannot use that file as audio track

If you have a file that Avidemux won't take, you can use FFmpeg to "strip" the container and extract just the raw stream: Alternatively, you can mux the audio and video