Basically, what I want to do is that all the MKVs I've got, have ffmpeg open them up, convert the FLAC to FLAC with the best compression possible, then remove the original flac from the MKV, and mux in the new flac in it's place, how can I do this?
and of course, I want ffmpeg to find ths MKVs itself, instead of me having to tell it each individual one.