ffmpeg -i "your_audio.flac" -acodec pcm_s16le -ar 48000 -ac 2 audio.wav
The most common culprit is attempting to import an or OGG file directly into a project where the output is set to copy, or simply because the internal decoder is failing to read the file header. avidemux cannot use that file as audio track
The audio file is in a container or codec not fully supported, such as certain WAV, FLAC, or specialized Dolby formats. ffmpeg -i "your_audio
When you see "Cannot use that file as audio track," Avidemux is essentially saying: “I cannot mux this audio stream into the selected video container without re-encoding, and my current audio output settings do not allow re-encoding, or the audio format is unsupported.” such as certain WAV