Look at the Format dropdown. If you are unsure, select . It is the most forgiving container for external audio.
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= Avidemux’s polite way of saying “I don’t like this file’s format, sample rate, or codec.” The universal fix: Convert to 48 kHz WAV (PCM 16‑bit) and retry. If still fails, use FFmpeg to mux externally. avidemux+cannot+use+that+file+as+audio+track
: 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 Look at the Format dropdown