ZoneMinder Forums

I have a 4 camera system. I have all three set up to record 24/7. Haven't gotten to the point to configure motion record yet. When I play any recordings back... like playing back me shoveling our driveway... it plays back at normal speed... but is a bit slow motion... it also skips about 5 seconds every 30 seconds or so. I exported video out to an avi and even playing this avi has the skips in it. Does anyone have any ideas as to why this is? I am recording at 10 frames a second as well.

Thank you very much,

Dzarn

dzarn wrote:I have a 4 camera system. I have all three set up to record 24/7. Haven't gotten to the point to configure motion record yet. When I play any recordings back... like playing back me shoveling our driveway... it plays back at normal speed... but is a bit slow motion... it also skips about 5 seconds every 30 seconds or so. I exported video out to an avi and even playing this avi has the skips in it. Does anyone have any ideas as to why this is? I am recording at 10 frames a second as well.

Well, not a lot of info to go on. But the most likely answer in my book would be a zm system with a slow filesystem [hard drive]... zm says go write write write write write and the OS buffers as much as it can until memory is exhausted. Then it flushes everything to disk (the gap), then the whole process starts over.

I'd run in three windows

top

iotop

watch -n 1 free


get a feel for what everything looks like when not recording, then force an alarm. You'll see zmc jump to the top of iotop, that's expected. But pay attention to your free buffers in the free window. I'm thinking they'll go way down, you'll get your gap while the system panic flushes, then they'll jump back up again.