Sorry, I'm no longer able to duplicate it. Somehow, I was able to repeat
it multiple times yesterday, but not today. I thought it would be
against ffmpeg, because I used the command vokoscreen was executing to
try to reduce the amount of software involved.
vokoscreen has output like:
> [vokoscreen
Public bug reported:
export DISPLAY=:0.0
vokoscreen fails to record, using ffmpeg.
export DISPLAY=:0 # no trailing ".0"
vokoscreen successfully records, using ffmpeg.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ffmpeg 7:3.4.4-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-39.42
