At least whisper.cpp only supports a few input formats like WAV and MP3. To get subtitles for videos I always have to first run ffmpeg to get an audio file and then run whisper.cpp. Guess this new feature may mean that I can do it in just one step, so slightly more convenient?

I see, thanks. I actually do almost all my Whisper work with ogg files, and got into a snag recently with m4a files. Transcoding to an equivalent size ogg or mp3 killed the quality, and wav is too big. Maybe FFmpeg could be of service here.