the original code used >= or <= as the test, but the code actually
implemented > or <. This causes an ffmpeg error when there is only 1
i-frame between the lower and upper bound.
-use the concat filter rather than segment+concat muxers
-currently, do not create a separate subtitle stream from closed
captions
-ffmpeg-myth-do-pending-jobs will look up recordings with a cutlist and
run the transcoder (ffmpeg-myth-cut) over each