If Avidemux continues to be uncooperative, or if you need more advanced features like mixing audio tracks, it's best to use a more robust tool.
This rewrites the container headers cleanly. Then try loading fixed.mp3 into Avidemux.
. Avidemux generally requires external audio tracks to be in raw or specific formats like WAV, MP3, or AC3 to properly mux them with video. Common Causes Unsupported Containers : You are trying to load an
Avidemux struggles with certain Variable Bit Rate audio files when aligning them with a video track. It prefers Constant Bit Rate (CBR) audio. avidemux cannot use that file as audio track
This is, by far, the most frequent offender. You try to add a file like song.m4a or audio.mp4 , and Avidemux rejects it.
Fix: Avidemux "Cannot use that file as audio track" Error The . While Avidemux is an exceptional tool for quick, lossless video cutting and multiplexing, it lacks internal demuxers for external audio tracks wrapped inside standard multimedia containers like .m4a or .mp4 .
Avidemux often rejects audio files (like AAC) that are still wrapped in an MP4 or M4A container when you try to use them as an external track. It prefers "raw" formats (like AAC in an ADTS/LATM envelope, WAV, or raw MP3). Traktor/Metadata Mess: If Avidemux continues to be uncooperative, or if
Instead of setting Audio Output to "Copy", try forcing Avidemux to re-encode the audio on export: Change from "Copy" to AAC (FDK) or MP3 (lame) . Go to Audio > Select Track .
: You are likely trying to import an .m4a file. In Avidemux, .m4a is seen as an MP4 container without a video track, which the software cannot process as an external source.
The most frequent cause is trying to load an or AAC file extracted from a smartphone or music store. Avidemux expects raw audio streams for external tracks. It prefers Constant Bit Rate (CBR) audio
Ensure that you're running the latest version of Avidemux. You can check for updates by:
The audio codec might not be compiled into your version of Avidemux, or it's an advanced format not yet supported. avidemux.org The "How": Quick Solutions Use Nightly Builds: Make sure you are using the latest Avidemux 2.8.x nightly build Convert to RAW: or FFmpeg to re-export your audio as raw AAC, WAV, or MP3. Ensure CBR:
Some users have reported success using this when the standard Select Track method failed. Try this as a specific workaround for AVI files.
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The audio is packed within an unsupported container, such as a high-definition video container (e.g., .mkv or .ts) that contains only audio.