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I need suitable parameters for very, very long screen captures using ffmpeg.

  • Quality: Only occasionally needed. If text is readable, that's enough usually. I can use -qscale:v *[0-32]*, of which higher actually means lower quality.
  • Efficiency: I expect the output video file size to increase nearly by nothing when nothing on the screen is moving.
  • In webm, I noticed a weakness that skipping to places not near the beginning of the video can be slow. Am I doing anything wrong? This only happens to webm.

My current setup:

ffmpeg -f x11grab -r 15 -i -qscale:v 32 -vcodec vp9 Screencast.webm

(15fps is enough for now)

Do you know an alternative?

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