The command line was

ffmpeg -i sample_in.mp4 -vcodec libx264 -vpre superfast -b 2000k -acodec
copy -s 1280x720 -aspect 16:9 sample_out.mp4


with varying params for -vpre  (e.g. medium ultrafast), differnt
bitrates (700k...2000k)  and different input files (e.g. mp4 with bad
aspect ratio, or mpeg2).

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https://bugs.launchpad.net/bugs/937678

Title:
  missing support for H264 profile main level 3.1 and security issue

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