James, if you can please report this (feature request) to the upstream,
which may bring more possibility that your request would be included into
xscreensaver code.

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https://bugs.launchpad.net/bugs/1449233

Title:
  ffmpeg not used by xscreensaver-getimage-video

Status in xscreensaver package in Ubuntu:
  Invalid

Bug description:
  xscreensaver-getimage-video does not support ffmpeg as a video
  capturing program.

  A command to grab a single frame of video from the webcam would be:

  ffmpeg -i /dev/video0 -ss 00:00:01 -vframes 1 -f png <filename>

  ffmpeg is a relatively common program to have, and so including it as
  an option for xscreensaver-getimage-video would be useful.

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