Most transcription services want your file on their servers
before they'll give you a word of it. That means waiting for it
to arrive, trusting someone else with a recording that might be
a private interview, a client call, a medical appointment or
a recorded lecture —
and usually paying by the minute once you're past a free trial.
This runs the speech model on your own machine instead. Nothing
is sent anywhere, so there's nothing to wait for and nothing to
meter. A two-hour recording costs the same as a two-minute one,
which is to say nothing at all.
Once you have the words, you can add
captions to the video from the same transcript, or
trim the video down to the part worth
keeping.