DLINK DCS-900B

Knobee · Post by **Knobee** » Wed Sep 20, 2006 7:48 pm

I've just picked up one of these (having seen the "oh yeah, it works" and missing the "oh, it sucks if you have the version B").

Anyway, trying to make the best of a bad situation, can someone tell me if this link might help in getting a higher framerate?

http://forum.java.sun.com/thread.jspa?t ... ID=3701758

Look at the posting that mentions reading a different number of lines in the mjpeg headers between the DCS and the AXIS cameras.

Somehow, the D-LINK folks are able to get a good stream from the camera via java/active-x... why not us?

Knobee · Post by **Knobee** » Wed Sep 20, 2006 9:00 pm

BTW, I've run tcpdump against the stream that is created by the d-link application and find this:

Code: Select all

===SNIP===
[...jpg data...]

--video boundary--
Content-length: 9417
Content-type: image/jpeg

[...jpg data...]
===SNIP===

Can anyone provide me a similar dump from an AXIS camera?

Thx!

Knobee · Post by **Knobee** » Thu Sep 21, 2006 4:38 am

As much as I hate to followup to myself, I've found a demo of "Active WebCam" that is able to pull the video stream from a DCS-900B at 20+FPS.

Here's the start of the stream:

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GET /video.cgi HTTP/1.1
Accept: */*
User-Agent: HTTP agent
Host: 192.168.168.138
Cache-Control: no-cache

HTTP/1.0 200 OK
Server: Camera Web Server/1.0
Auther: Steven Wu
MIME-version: 1.0
Cache-Control: no-cache
Content-Type: multipart/x-mixed-replace;boundary=--video boundary--

--video boundary--Content-length: 12260
Content-type: image/jpeg

......VVL.00..............
...

(note that the first frame does not have a <cr> between the --video boundary-- and the "Content-length" string)

a jpg image follows, and is then split with the following:

Code: Select all

.Fx.q.8....b.l*.?.B.6...B...Q.;.jT.l\.s.j,......

--video boundary--
Content-length: 12500
Content-type: image/jpeg

......VVL.00..............
...

Any ideas on why ZoneMinder won't stream this?

Currently I'm using the video.jpg method and getting about 2fps.

Thanks!
Knobee

Post by **zoneminder** » Thu Sep 21, 2006 9:26 am

I have Axis cams but none are powered on at the mo and Im not in the same building. If necessary I can get a stream later on.

Do you know why you are only getting 2fps? Is it because that is all the cam is feeding or (more likely) because ZM is barfing at the bogus stream format and restarting the capture daemon?

Check /var/log/messages and zmdc.log to see if zmc is being restarted. If it is not then you will probably need to put up debug on zmc so we can see exactly what is happening. Do you know if you are using regular expression matching or not?

Knobee · Post by **Knobee** » Thu Sep 21, 2006 1:35 pm

zoneminder wrote:Do you know why you are only getting 2fps? Is it because that is all the cam is feeding or (more likely) because ZM is barfing at the bogus stream format and restarting the capture daemon?

Actually, if I use the "image.cgi", I get zero FPS... it won't read the image at all. The 2FPS is via the use of "image.jpg" and (I'm assuming) a continuous poll of the camera.

Check /var/log/messages and zmdc.log to see if zmc is being restarted. If it is not then you will probably need to put up debug on zmc so we can see exactly what is happening. Do you know if you are using regular expression matching or not?

I'll check this in a bit. Thanks for the quick response. Regular expression matching is enabled.

Note: http://www.zoneminder.com/forums/viewtopic.php?t=6793 is the "bad news"... I'm thinking that this can be worked out, however. It seems to be just a change in the way they are presenting the stream..

Knobee

Post by **zoneminder** » Thu Sep 21, 2006 3:38 pm

Ok. If it just boils down to the missing crlf before the boundary I may be able to get you a custom patch.

Knobee · Post by **Knobee** » Tue Oct 10, 2006 2:55 pm

Getting expert help, I was able to determine that yes, dlink broke the streaming jpeg format in the rev B cameras, but there is hope:

use the url: /mjpeg.cgi

and turn off regexp matching in ZoneMinder.

I've been able to get up to 30fps from my DCS-900(b)

Knobee

pathway · Post by **pathway** » Fri Dec 22, 2006 6:07 pm

The Post above by 92 is a spam... and it's a link to a windows executable. (Don't know what it is, I'm on a Mac... but I bet it's malware.)

FYI

--Pathway

jameswilson · Post by **jameswilson** » Sun Dec 24, 2006 11:40 pm

which post?

Knobee · Post by **Knobee** » Mon Dec 25, 2006 12:02 am

jameswilson wrote:which post?

The one that seems to already have been removed.

Merry Christmas, all!

jameswilson · Post by **jameswilson** » Mon Dec 25, 2006 12:05 am

lol i see
happy christmas

Post by **cordel** » Tue Dec 26, 2006 10:19 pm

Yeah I caught it not put five minutes vafter you posted, I was going to remove your notice as well but forgot what post it was

Best just to PM us to let us know so that we don't clutter up the forums and end up being as bad as the spamers, and I'm sure most are smart enough to realize what is spam.

Cheers,
Corey