Go to Audio → Main Track → External Track , then choose Copy or Convert to PCM (not “Copy” if using MP3/AAC externally).

Sometimes, Avidemux simply cannot handle a specific file. It is not a professional audio engineer. If you have spent 20 minutes troubleshooting, consider these alternatives for muxing external audio: avidemux+cannot+use+that+file+as+audio+track

Has anyone found a reliable workaround? Is there a specific format Avidemux expects?

Ensure you are using at least version 2.8.1 or a recent nightly build, as newer versions have improved demuxer support. Go to Audio → Main Track → External

The dialogue box stayed hidden. The track appeared in the slot, ready and waiting. Elias hit "Save," and watched the progress bar sprint toward 100%. As the sun began to bleed through his blinds, the "File saved successfully" notification appeared—the most beautiful sentence he had ever read.

Convert your audio file to one of the following formats, which are natively supported as external tracks: (Constant Bit Rate is most stable). AC3 . WAV (16-bit or 24-bit PCM). Raw AAC (ADTS-encapsulated). 2. Use FFmpeg for Quick Remuxing If you have spent 20 minutes troubleshooting, consider

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