Fix the no-conversion of Opus audio files
This PR fixes the no-conversion of Opus audio file:
- #2818

because the following PR does not avoid the conversion of Opus audio files to WAV:
- #2832

CC: @Airop 
Fix the no-conversion of Opus audio files: This PR fixes the no-conversion of Opus audio file:
- #2818

because the following PR does not avoid the conversion of Opus audio files to WAV:
- #2832

CC: @Airop 