Thanks to all who responded,
but ffmpeg is apparently still not found on my system.

cat workshop2.VOB | ffmpeg -i - workit.mp4

ffmpeg: command not found

This was after I did this:

sudo apt-get update ; sudo apt-get install ffmpeg

Then this:

dpkg -l *ffmpeg*

Got this result:

|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version       Architecture  Description
+++-=================-=============-=====-=======================================
ii  ffmpegthumbs      4:4.14.2-0ubu amd64 video thumbnail generator using
ffmpeg
ii  gstreamer0.10-ffm 0.10.13-5ubun amd64 FFmpeg plugin for GStreamer
ii  kffmpegthumbnaile 1.1.0-0ubuntu amd64 video thumbnailer for KDE
ii  libffmpegthumbnai 2.0.8-2       amd64 shared library for
ffmpegthumbnailer
ii  libxine1-ffmpeg   1.1.21-2ubunt amd64 MPEG-related plugins for libxine1



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