In my current job I've run into anomalies. I will welcome your comments.

ISSUE #1: ffconcat v concat.
Below are two scripts that do the same thing, but with radically
different results.

Why is that?

The following script provokes many DTS errors and aborts when loading
VTS_01_2.VOB.
  set _NAME_=DAS BOOT [1981][2004] 2of2
  set _WORK_=c:\work\
  set _JOB_=%_WORK_%%_NAME_%
  set _GET_=%_JOB_%va.concat.txt
  echo ffconcat version 1.0>"%_GET_%"
  echo file z:\VIDEO_TS\VTS_01_1.VOB>>"%_GET_%"
  echo file z:\VIDEO_TS\VTS_01_2.VOB>>"%_GET_%"
  echo file z:\VIDEO_TS\VTS_01_3.VOB>>"%_GET_%"
  echo file z:\VIDEO_TS\VTS_01_4.VOB>>"%_GET_%"
  echo file z:\VIDEO_TS\VTS_01_5.VOB>>"%_GET_%"
  echo file z:\VIDEO_TS\VTS_01_6.VOB>>"%_GET_%"
  echo file z:\VIDEO_TS\VTS_01_7.VOB>>"%_GET_%"
  set _PUT_=%_JOB_%va.mp4
  ffmpeg -i "%_GET_%" ... "%_PUT_%"

But the next script succeeds cleanly.
  set _NAME_=DAS BOOT [1981][2004] 2of2
  set _WORK_=c:\work\
  set _JOB_=%_WORK_%%_NAME_%
  set
_GET_=concat:z:\VIDEO_TS\VTS_01_1.VOB^|z:\VIDEO_TS\VTS_01_2.VOB^|z:\VIDEO_TS\VTS_01_3.VOB^|z:\VIDEO_TS\VTS_01_4.VOB^|z:\VIDEO_TS\VTS_01_5.VOB^|z:\VIDEO_TS\VTS_01_6.VOB^|z:\VIDEO_TS\VTS_01_7.VOB
  set _PUT_=%_JOB_%va.mp4
  ffmpeg -i "%_GET_%" ... "%_PUT_%"
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