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Yeah. snavtclient -H your.dvr.ip.address -u user -p pass -q 0 -j /tmp/snapshot.jpg I can not tell you where to find it though due to this board's odd anti-spam policy. One of the previous posters links has a link.

After spending numerous hours looking at network capture output of traffic between Video Server E and AV TECH DVR I am quite confident to say that the software does not initiate nor need connections to any other port. If I had a similar problem, I would do a packet capture using a tool like Wireshark to see what goes wrong. It requires some level of understanding of networking protocols. If your port-forwarding firewall does anything else to the relevant IP packets than just re-forwards them as they are, it is possible that the packets arrive to the DVR in a format which it does not understand. AV TECH's TCP implementation is extremely buggy and will fail miserably for example if an HTTTP request does not arrive contained within a single TCP packet (but gets instead fragmented to two packets). Also the protocol is a mixture of HTTTP and odd kludges which means that if your firewall is trying to validate that you are passing proper HTTTP data, it will fail miserably also. Please note that I am writing HTTTP with three T's on purpose because this board's stupid spam filter thinks I am a spammer otherwise (ouch...). (A couple of my previous posts remained unposted because I didn't figure this out and didn't bother fighting with the stupid spam filter.)

I just wanted to give heads up that I implemented keyboard based DVR control today and released a new version 0.0.3 of snavtclient software. For me using the keyboard to switch channels etc. is quite a lot more faster and convenient than clicking around with a mouse (as is the case with vendor supplied software).

I am currently in process of writing an efficient and small AV TECH DVR client software which runs on Linux and *BSD operating systems. It is still in early stages of development, but already performs the following functions: - displaying the DVR video stream on display - saving video stream frames to individual JPEG files on disk at specified time intervals - storing file attachments in e-mails sent by the DVR device (a separate Perl script) There is no DVR control yet and many other things are also still missing, and it is distributed in source code format only right now. I would encourage any owners of AV TECH DVR equipment to try out this software to see if it functions with their specific DVR model. Doing this right now requires that you have the skills to use Unix shell to compile and run software. Please report any successes or failures to me at my e-mail address included in the software documentation and the web site. The software is licensed under GNU AGPL which means that everybody is allowed to use the software for free (including commercial purposes) and it can be re-distributed under certain conditions. As this is my second post to this forum, I am not allowed to tell you where to find the software, as there is the odd policy against posting links. You might be able to find it if you use a popular search engine to look for snavtclient. If you end up at SourceForge pages, select "Project Web Site" at the right edge to get to the actual site you want to find. You will see my username on this board as a part of the domain name when you have found the right place. Sorry about the complex instructions but I wouldn't like to get banned. Maybe some older member would be able to post a link to the software web site? I hope I will not be considered a spammer, at least there is no profit involved because the software is free. I would like to repeat: the software is still in its infancy and lacking many essential features, but it could be useful to someone already, and I would also like to get some feedback... It is under active development. Stay tuned!