fixing monitor problem on zoneminder
| Posted in anything | Posted on 14-08-2009
6
After installing Zoneminder, some people (including me) reported that they had a problem with monitor. A black screen, or even no picture / video at all. From logs, it’s usually said: “Can’t get shared memory id…” or “Shared memory invalid…”, something like that. Especially when we’re using a webcam.
After googling, i found some solutions for this. First, increase the shared memory, and second, edit zmdc.pl file.
1. Increase shared memory maximum
Open the file “/etc/sysctl.conf”, and paste this 2 line at the bottom of the file.
# Increase the maximum shared memory
kernel.shmmax = 167772160
save, and restart your machine.
If still no luck, continue to the next step:
2. Edit zmdc.pl
We need to edit zoneminder source to point the video driver.
Open file ” /usr/bin/zmdc.pl” (the location on some machine, might be different)
and add this code, right before the “my @daemons =….” (about line 64).
$ENV{LD_PRELOAD} = ‘/usr/lib/libv4l/v4l1compat.so’;
.
*UPDATE!* added by ldp
Also work:
$ENV{LD_PRELOAD} = ‘/usr/lib/libv4l/v4l2convert.so’;check your /usr/lib/libv4l or /usr/lib64/libv4l directory for other files to preload
save, and restart your zoneminder.
WALLA!!!
it works like charm…
It Wokrs, finaly it works, Tanks to You
WORKS!
Running Ubuntu 10.04 server.
ZoneMinder v1.24.2
0ac8:301b Z-Star Microelectronics Corp. ZC0301 Webcam
driver zc3xx
may work on other gspca webcams
Cut and Paste to zmdc.pl failed :
Unrecognized character \xE2 in column 20 at /usr/bin/zmdc.pl line 65.
Changed : $ENV{LD_PRELOAD} = ‘/usr/lib/libv4l/v4l1compat.so‘;
To : $ENV{LD_PRELOAD} = ‘/usr/lib/libv4l/v4l1compat.so’;
Could be difference in fonts? but the ‘ is not the same as ‘
Also $ENV{LD_PRELOAD} = ‘/usr/lib/libv4l/v4l2convert.so’;
Works
check your /usr/lib/libv4l or /usr/lib64/libv4l directory for other files to preload
yes, that should be a single quote ‘,
but my text editor changed to: ’
you have to fix the single quote before paste to zmdc.pl
thanks.
[...] then finally I stumbled on this site and in an instant my problems were solved! I could not believe that 1 line of code fixed all my [...]
It’s work fine on ubuntu 11.04 and sonixj chipset of webcam. Thanks for you solution. Regards.
Hello: i’, trining to fix this problem, your fix didn’d work for me.
should be like this?
my @daemons = (
$ENV{LD_PRELOAD} = ‘/usr/lib/libv4l/v4l1compat.so’;
‘zmc’,
‘zma’,
‘zmf’,
‘zmfilter.pl’,
‘zmaudit.pl’,
‘zmtrigger.pl’,
‘zmx10.pl’,
‘zmwatch.pl’,
‘zmupdate.pl’,
‘zmtrack.pl’