WAV files have the highest success rate because they lack the complex metadata that often confuses Avidemux. 2. Check the "Audio Configuration"
: Older versions may have bugs with specific codecs that are fixed in newer nightly builds . Recommended Solutions Cannot use mp3 as audio track - avidemux.org
: Avidemux cannot invoke demuxers for external audio tracks. If you try to add an .m4a or .mp4 file as an external track, it will fail because these are containers, not raw streams.
If you answer these three questions correctly, Avidemux will work beautifully. If you ever get stuck, switch to and Audio Output = PCM – that combination will save you every time.
: External tracks must generally be "raw" bitstreams. For example, while standard MP3s often work, AAC files must be in an ADTS- or LATM-encapsulated format, not a standard .m4a file. avidemux+cannot+use+that+file+as+audio+track
Export your audio from a tool like Audacity as a 16-bit PCM WAV file before adding it in Avidemux. This almost always works, as WAV is a very basic and well-supported raw format that Avidemux handles reliably. The official forum suggests adding an external track as an uncompressed .wav file and encoding it when saving the video. You can also export as MP3 or AAC using the methods below, but WAV is the most foolproof.
This is the #1 culprit. You're trying to give Avidemux a file that is actually a , not a raw audio stream . A container (like MP4, MKV, or M4A) can hold video, audio, and subtitle streams, plus lots of metadata. Avidemux's demuxer plugins are not designed to understand audio-only files in these formats.
This can occur if you've updated your operating system or the tools used to create the audio files. The specific way an audio file is encoded or tagged can change over time. In some cases, the audio detector in Avidemux might also incorrectly identify a file, like misinterpreting an AAC file as AC3.
ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac output.mp4 : Keeps the video quality identical. WAV files have the highest success rate because
Compressed streams like .ogg (Vorbis) or raw .flac are only supported during internal video re-encoding. They cannot be imported externally.
If you don't have a video, you may need to use a different tool like Alternative Tool: FFmpeg (Command Line)
Avidemux handles streams inside containers much better than raw, standalone audio files. If you wrap your audio file inside an MKV container, Avidemux can usually read it perfectly.
This error is frustrating because it halts your workflow immediately, and the error message itself offers very little explanation. If you are staring at this prompt, don't worry. It is rarely a sign of a broken installation. Instead, it is usually a technical mismatch between your video project settings and the audio file you are trying to import. Recommended Solutions Cannot use mp3 as audio track
Avidemux’s mode hates Variable Bitrate (VBR) MP3 files. When you cut video on keyframes, VBR audio loses sync because the bitrate fluctuates. Avidemux is old-school; it prefers Constant Bitrate (CBR).
Download and open (a free, open-source tool).
If you prefer a graphical user interface, use the open-source editor Audacity to strip out confusing metadata and containers. the problematic audio file into Audacity. Go to File > Export Audio .