iMovie 10 subtitles?

these snaps should provide the method.

Extracting/making a .srt file is another thing entirely.

There are on-line sellers of the transcribe to .srt service (MacWhisper is one app that will speech to text to .srt).

Some do translation as well.

This is all post picture edit. IE: as we say, Locked.

The timing depends on the lock. So the .srt extract has to be from a locked picture edit.

As you can see in the bottom snap, the .srt file includes "time code".

HB reads the time code and does the rest. It doesn't take any additional time, near as I can tell.

Navigate to .srt/subtitle track.

Check burned in box and UTF-8 encode.

It probably can be done with Subler as well. But timing may not be as automatic.

If necessary, if timing is off, both apps can create offsets, a rpita.

I have done it with foreign films that arrive without subs and Subler.

As Bruno Mars sang “I can see clearly now”.

allegedly. prob a taste of auto tuna.