A podcast does not come with subtitles, so podqast makes them: it listens
to the episode itself, a few minutes at a time, and only around where you
are listening. Nothing is done in advance, which is why the bar says how
much of the episode you can read so far.
Each stretch is heard by a speech model, cut into lines at the pauses and
full stops, and translated in one go — what was said on top, English
under it, and the two lit together piece by piece as they are spoken.
It is a machine doing it, so it is wrong sometimes. What was said is
always the line on top.
