[FFmpeg-user] x11grab video stalls every 30 seconds in screencapture

hirschhornsalz gupiez at gmail.com
Wed Dec 11 01:52:56 CET 2013

If the stall happens exactly every 30 seconds, it is most likely from the
linux kernel, which does a dirty page writeback if a page gets older than 30
If the amount of memory written in 30 sec is to big, the writeback may last
significantly longer the a frame (33 msec) and you lose frames.

You can try either

for a writeback every second (possibly a even lower value)
or, if you have lots of RAM (more than the size of the screencast)

for completely avoiding writeback fpr 10 minutes worth of screencast.

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