ZoneMinder Forums

I was sucessfully using Zoneminder on a home server setup on Ubuntu 9.04.

I recently upgraded my system including a new motherboard and CPU so decided to do a fresh install and upgraded to Ubuntu 9.10.

I have now completed three fresh installs and followed a number o guides on here trying both memory map setups and the initial memory setup where you have to calculate your shmmax and shmall.

Every time the install runs fine but I am left with a situation where my camera image is 'rolling' and has so many lines over it that you can't make out what is happening.

I have increased the debug to 5 and viewed as many logs as I can find but can't see the fault. I have even changed the slot that the capture card is sat in but to no avail.

Ironically, I remember having a similar problem some months back and have even posted here when I managed to solve it but for the life of me I can't remember what i did!

Has any one out there had a similar problem and solved it or is there any one who can think of a solution.

My last resort would be to replace the capture card, but I am reluctant to fork out for a new one at the moment, when I am sure that it is not the problem!

2 things off the top of my head.
might be one of those


V4L_MULTI_BUFFER Use more than one buffer for Video 4 Linux devices (?)
CAPTURES_PER_FRAME How many images are captured per returned frame, for shared local cameras (?)

Thanks for replying and sorry it has taken me so long to come back.

In the mean time I have done a fresh install of Ubuntu and ZM and am still having the same problem.

As far as your suggestions, the settings are as follows:

V4L_MULTI_BUFFER - I have tried this both on and off but with no change.

CAPTURES_PER_FRAME - It was at 1 and I have tried it at 2 and 3 but still with no luck.

This is really starting to do my head in! When I have it working, ZM is such a great bit of software but when I have prolems with the settings, it drives me mad![/code]

After you changed thouse setting did you restart zm if so try rebooting the pc.

Dug up old thread. http://www.zoneminder.com/forums/viewto ... highlight=

looks like you did the same thing

I tried both restarting ZM and the PC. I have also tried the options in that thread which is even more frustrating because as far as I can remember, it worked then!

The only real difference is that I was using Ubuntu 8.04 then and 9.10 now - I guess that is going to have to be my net step.

Well I have managed to resolve the problem.

I have had to set the device format to PAL Nc. No idea why as with the old setup, PAL worked as standard and I have not changed either the camera or the capture card. Must be something to do with the way that Ubuntu 9.10 differs from 8.04??

Any way, I now have two 640 x 480 feeds but only in grey. Colour seems to break it but as long as I have a picture thats the main thing. Ill do some more digging on the colour before posting again!

Maybe try to use v4l rather than v4l2

Thats the funny thing - I always used to use V4L set as PAL and it worked just fine. V4L does now not work and gives the 'rolling' image and the only way I have been able to resolve it to set V4L2 and PAL Nc.