Not more than 3 monitors

[hschroyen]

Hello,

I am running zoneminder 1.29 on a raspberry pi 3.
My intention is to use 4 camera's. The issue is however that I see 3 camera's and the 4th is always out.
If I turn-of one of the 3 working ones the 4th is showing.

So I do not suppose a configuration problem...it looks like more of a "limitation"...

I do see 'zmc -m 4' crashed, signal 6 for the 4th camera but do not know how to resolve this.

Any idea?
Suggestions?

Thanks

hschroyen

[knight-of-ni]

You are running out of ramdisk memory in /dev/shm
The raspberry pi simply does not have enough ram to do what you are trying to do.

We have stated repeatedly that it is unreasonable to expect a raspberry pi to work with more than a couple of HD resolution ip cameras w/o making significant compromises to the resolution, framerate, and/or image buffers.

[hschroyen]

Hi,

Thanks a lot of the answer.
I have read a lot on the forum but did not really saw this.

However and just for the record...you triggered me by telling to reduce the buffers.

As soon as I did that everything started working...

So case closed.

Regards

[knight-of-ni]

Reducing buffers does save save ram, but it also reduces the amount of pre-roll, a.k.a. time before the event, to record.

If you can live with that, then you simply move on to the next potential issue of simply overdriving the pi with all those cameras.
You can see other cases of raspberry pi owners who have already run into this by searching for threads dealing with zoneminder crashing or stopping randomly.