files, as Avidemux requires "raw" audio streams or specific encapsulation for external tracks. avidemux.org Common Causes & Fixes Unsupported M4A/MP4 Containers

Before adding an external audio track, ask yourself:

WAV files have the highest success rate because they lack the complex metadata that often confuses Avidemux. 2. Check the "Audio Configuration"

# To extract raw AAC from an M4A container ffmpeg -i input.m4a -acodec copy -bsf:a aac_adtstoasc output.aac Use code with caution. Copied to clipboard 3. Adjust Metadata