Avidemux+cannot+use+that+file+as+audio+track: ((new))

If yes, the problem was a codec mismatch. You can now change Audio Output from PCM to Copy or MP3 and test again to find the optimal setting.

Convert your VBR MP3 to CBR MP3 or PCM WAV using a tool like Audacity or FFmpeg before loading it into Avidemux.

Happy editing.

Go to Format dropdown in the main toolbar and select MKV V2 or MKV . Then try adding your external audio track again. Avidemux’s "Copy" 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).

This article will dissect every possible cause of this error, from container confusion to codec conflicts, and provide step-by-step solutions to get you back to editing. Before fixing the error, you must understand how Avidemux thinks. Unlike modern editors that use a timeline and re-encode everything seamlessly, Avidemux is a smart copy tool. It works best when it doesn't have to convert data. avidemux+cannot+use+that+file+as+audio+track

Avidemux is a beloved tool in the video editing world for one simple reason: it’s fast, free, and perfect for cutting, filtering, and re-encoding video without the bloat of professional suites like Premiere Pro or DaVinci Resolve. However, its simplicity has a downside. When something goes wrong, the error messages can be cryptic, unhelpful, and infuriating.

Temporarily change Video Output to Mpeg4 ASP (Xvid) or Mpeg4 AVC (x264) and set Configure to Constant Rate Factor = 22 . Then add the audio. If it works, the original video’s structure was broken. (You will have to re-encode the video, which is slow.) The Duration Mismatch If your external audio file is shorter or longer than the video by a fraction of a second, Avidemux’s copy mode may panic.