ffmpeg -i input_audio.m4a -acodec copy -absf adts output_audio.aac Use code with caution.
Avidemux generally requires raw audio streams for external tracks rather than audio already inside a container like .m4a or .mp4 . avidemux cannot use that file as audio track
If you are trying to replace audio, make sure the new track is the same length as the video to avoid synchronization issues. Cannot use mp3 as audio track - avidemux.org ffmpeg -i input_audio
ffmpeg -i video.mp4 -i audio.mp3 -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 output.mp4 Use code with caution. 3. Update Avidemux Cannot use mp3 as audio track - avidemux
For successful "Add Audio Track" operations, aim for these specific formats: Best for quality; use 16-bit for maximum compatibility. MP3 Widely supported; ensures the file is not corrupted. AAC Must be raw .aac (ADTS), not .m4a . AC3 / DTS Supported for multi-channel audio.
Files like 32-bit WAV or DRM-protected files (often found in Apple's .m4a format) frequently trigger this rejection.
The error message typically occurs when you attempt to add an external audio file that is in an unsupported container format or has incompatible metadata. Avidemux is strict about the types of external streams it accepts during the "Select Track" process. Common Causes of the Error