If the file is already MP3 but VBR, try:
: Some versions of Avidemux struggle with 32-bit float WAV files; using 16-bit PCM WAV is more reliable. Common Fixes avidemux+cannot+use+that+file+as+audio+track
| Problem | Solution | |---------|----------| | MP3 VBR | Convert to CBR MP3 or WAV | | AAC from MP4 | Convert to WAV | | Opus / OGG | Convert to WAV | | 96 kHz sample rate | Resample to 48 kHz | | Multichannel audio | Downmix to stereo | | Video file as source | Extract audio to WAV first | | Still fails | Use (always works) | If the file is already MP3 but VBR,