whisperx also adds improved timestamping, closed captioning output, and beta diarization (speaker labeling) support. unfortunately it doesn't seem to support m

whisperx also adds improved timestamping, closed captioning output, and beta diarization (speaker labeling) support. unfortunately it doesn't seem to support m4a out of the box but you can convert to mp3 (upgrade the sound lib dependency first) or wav with ffmpeg.