be prepared when a user selects a file that isn't strictly mono and other file extensions as well
This issue is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 7 days. This issue was closed because it has been inactive for 7 days since being marked as stale. You can choose the channel with https://github.com/NVIDIA/NeMo/blob/c9c4bee40f839990c3382694b618ac117e601f68/examples/asr/transcribe_speech.py#L124 

regarding formats: we currently support: `wav, flac, mp3`
In your ```transcribe_utils.py``` script you need to be prepared when audio files are in stereo or other channels as well.

You can use ```pydub``` but I prefer to use ```soundfile```.  Either way, you need to be able to handle a wide variety of file formats and channels and gracefully convert them - even temporarily in a temp file - so that the program doesn't stop working altogether.