I have just had a look at the solution via subtitles:
Pro:
* It works and the SRT format is simple enough to be written by a script.
Cons:
* SRT subtitles are written time-based and not frame-based, which takes
some calculations, starting the subtitles shortly before the frame and
ending it within the frame.
* This does not seem to work at the start of the video (frames 1, 2).
* I seem to have no influence on where the subtitle is placed. It
appears at the middle of the bottom.
...
The drawtext filter has an option to read text from a file, but I guess
this cannot easily be used to read lines on a per-frame basis (?).
Wolfgang Hugemann
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