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?