Alternatively, you can mux the audio and video together directly in FFmpeg to bypass Avidemux entirely:
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
If an MP3 still fails, the file might have a large header. Community experts suggest that stripping the first few kilobytes of the file (which often contain non-standard metadata) can sometimes allow Avidemux to "see" the actual audio frames. Supported External Audio Tracks 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
Avidemux generally requires raw audio streams for external tracks rather than audio already inside a container like .m4a or .mp4 . Alternatively, you can mux the audio and video
Ensure you are using at least or the latest nightly build . Developers frequently release updates to handle tricky metadata in MP3 and AC3 files that previously caused this error. 4. Check File Metadata
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 Community experts suggest that stripping the first few
If you have a file that Avidemux won't take, you can use FFmpeg to "strip" the container and extract just the raw stream: