I'm looking for something to transcribe .m4a recordings that I make for my genealogy efforts. Do you know of anything that can take a file as input?

Whisper.cpp will do it, and you can also use Parakeet v2, though I haven't tried running that one specifically.

If you're familiar with CLI you could use ffmpeg to extract audio then pipe the audio into whatever transcriber

I use ffmpeg a lot, but I'm curious if anyone can recommend a transcribe tool.