Monitor slow on LAN, not on WAN...

[mrbasher]

Hello all, I just recently got ZM up and running a few weeks ago and it works great for me so far with one exception.

First I should explain what I have going on:
- PC in the garage with two wired cams connected to a generic capture card off ebay (4 channel by 30fps)
- PC is connected to my wireless network (connected using 802.11 G)

Here's the situation:

When connected from outside my network, things work great and are nice and snappy. The monitors show at near realtime.

When connected from inside my local network, things are fine until I try to watch the monitor. When I do this they only update every 5 seconds. It's quite odd. It's always 5 seconds, based on the timestamp on the images. I am watching from a laptop that is connected via wireless N.

Initially I thought maybe I was having networking issues... However, my file transfer speeds from the laptop to the zoneminder box are excellent. As well, when watching recorded events, they are smooth and nothing like the monitor view. My next step was to connect my laptop directly to my wireless router to see if it made a difference. (The router is also the gateway)

Have any of you seen anything like this? I used the search here and didn't see much or at least nothing specific to this. I don't have anything crazy going on in my network. No special subnetting or anything. I have checked this on Firefox, Chrome and IE9, the results are the same on all. I've also tried with and without Cambozola.

Thanks for your help.

[scotts777]

I'm having the same issue - there is between a 5-30 second delay updating live video feeds.

I've noticed that this only happens on Chrome for Mac and Internet Explorer for PC.

On Safari Mac, Firefox Mac and Firefox PC it works perfectly.

I'm going to keep searching for a solution and will post it if/when I find. But in the meantime, try using other browsers and see what happens.

[scotts777]

I did some more digging, and it this article from the Wiki seems to explain this issue:

Mozilla-based browsers support native decoding of multipart JPEG streams. For browsers without this native support (IE, Chrome) you need a Java plugin called Cambozola.

I cut and pasted the article below since the Zoneminder forums don't allow posting links.

+++++++++++++++++++

Cambozola is a Java plugin that decodes multipart JPEG streams. Mozilla-based browser have native support, so this plugin is for browsers like Internet Explorer that lack that support.
To install Cambozola for use in zm, Download the cambozola.jar file from the Downloads page or directly from the charliemouse website. If you download from charliemouse you will need to extract the one file (cambozola.jar) from the archive. Place cambozola.jar in the ZM root web directory (so if your web pages for ZM is installed at /var/www/html/zm the file should go there as well). Now all thats left to be done is to enable it in ZM goto options and under the web tab check that cambozola is enabled. In 1.25 you will find OPT_CAMBOZOLA under the Images tab. That's it, you're done.
http://www.zoneminder.com/forums/viewtopic.php?t=5745
http://www.zoneminder.com/forums/viewtopic.php?t=6320
NOTE: If you find that the Cambozola applet loads in IE but the applet just displays the version # of Cambozola and the author's name (as opposed to seeing the streaming images), you may need to chmod your cambozola.jar:
$ sudo chmod 775 cambozola.jar
Once I did this, images started to stream for me.

[mrbasher]

Thanks for your input Scott.

After a lot of messing around I finally realized what the issue was. It was a "DOH!" moment for sure...

I had the bandwidth setting on Low at home, for whatever reason it kept defaulting to this. That setting directly affects this. In fact in the settings for Low B/W, one says " How often (in seconds) the status refreshes itself in the watch window (?)" the default is 10 for this.

As soon as I changed to medium or high, I got what I wanted.