Avidemux Cannot Use That File As Audio Track Today

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

Avidemux generally requires raw audio streams for external tracks rather than audio already inside a container like .m4a or .mp4 .

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. avidemux cannot use that file as audio track

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

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 Alternatively, you can mux the audio and video

Certain MP3 files with specialized metadata (like Traktor tags) can confuse the software, causing it to misinterpret the file's structure.

ffmpeg -i input_audio.m4a -acodec copy -absf adts output_audio.aac Use code with caution. AAC Must be raw

Must be in an ADTS envelope (raw .aac file), not a .m4a container. AC3/E-AC3: Standard Dolby Digital formats. 2. Re-wrap with FFmpeg (Advanced)