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RE: Maximum USB
I have two webcams and a spare usb hub and would very much like
to check out the usb option first. If it works for me then I will stick to
it.
What application are you using ? one that you wrote ?
-----Original Message-----
From: Dan [mailto:dtoma@xxxxxxx]
Sent: Tue 10/09/2002 16:39
To: ukha_d@xxxxxxx
Cc:
Subject: Re: [ukha_d] Maximum USB
I think that an analog B/W camera is more
expensive than a color USB one, with mic included.
More than that, the driver of the USB cam
can do all the adjustments automatically (like sensibility, number of
frames per second, contrast, etc.). Especially for suveillance, where you
don't need 25 frames/s, decreasing the frame rate to 5 or 3 frames/s can
give you much better quality al low light (s/n ratio).
Other dissadvantages of analog cams in
surveillance:
- separate power supply (cheaper ones can
get a lot of power)
- cheaper capture cards need a lot o
processing power to capture the video
A very good surveillance application,
cheaper for single cam but much more expensive in multicam version is
Gotcha! (see http://www.gotchanow.com/ ).
Unfortunately, the multicam version doesn't
work with standard USB cams.
One of my webcams is connected to the Gotcha
application and accessible on the Media Encoder too, as a Screen Capture (a
small trick..:) ).
Any other opinions?
Dan
-----
Original Message -----
From: Amar
Nagi <mailto:groups@xxxxxxx>
To:
ukha_d@xxxxxxx
Sent:
Tuesday, September 10, 2002 6:24 PM
Subject: RE:
[ukha_d] Maximum USB
I have just
thought of a potenial solution
I have a av
hub with remote control (about 30quid)
I have a tv
card which was 15pounds.
I could
control the signal i want to monitor by remotly controlling
the av hub
via infrared.
All i would
need are some budget cameras (b/w) and software that is it
i think
anyone see a
problem with this ? what software could i use
-----Original Message-----
From: Dan [mailto:dtoma@xxxxxxx]
Sent: Tue 10/09/2002 15:55
To: ukha_d@xxxxxxx
Cc:
Subject: Re: [ukha_d] Maximum USB
First public version will be a small client
with a mediaplayer frame inside and a listbox with all the available source
at the encoder.
You will be able to remotely select one of
(let's say) 4 USB connected webcams.
The list will be loaded at startup with all
the available source (can be audio, video or AV).
In this moment I have 3 USB webcams (with
mic included) and the AV receiver output connected to a Pinnacle Lynx USB
AV cable (again with his own mic).
In that way, I can use the system not only
for surveillance purpose, but even to remotely select one of the home
entertainment system AV sources (vcr, sat, TV, DVD) using Infrared Remote
Manager.
Even when I am abroad, I can see my
favourite radio/tv program using Windows Media streaming.
Sounds interesting for you?
BR,
Dan
-----
Original Message -----
From:
Amar Nagi <mailto:groups@xxxxxxx>
To:
ukha_d@xxxxxxx
Sent:
Tuesday, September 10, 2002 5:45 PM
Subject:
RE: [ukha_d] Maximum USB
sounds
interesting dan
look
forward to seeing it
-----Original Message-----
From: Dan [mailto:dtoma@xxxxxxx]
Sent: Tue 10/09/2002 15:25
To: ukha_d@xxxxxxx
Cc:
Subject: Re: [ukha_d] Maximum USB
Hi,
I make some tests. Theoretical limit is 5m per segment for a maximum
of 5 segments.
Practically, using STP cable I get reliable connection even at 10m. It is
possible to get even more.
You can use the 8 wire like that:
- 4 for the standard usb pins
- 2 for power supply GND
- 2 for +5V for the powered hub.
Take care that it is possible not to be able to use 2 webcams on the same
USB hub. Usually, one cam request aprox. 75% of the bandwidth.
BR,
Dan
P.S. This is what I use in this moment.
I will post in a couple of days, on my site (http://www.geocities.com/tdanro)
a small application to select one of the AV source connected to a Windows
Media Encoder remotely, when not home.
Is very usefull for surveillance purpose.
----- Original Message -----
From: Amar Nagi <mailto:groups@xxxxxxx>
To: ukha_d@xxxxxxx
Sent: Tuesday, September 10, 2002 5:18 PM
Subject: [ukha_d] Maximum USB
What is the maximum length usb lead i can have
between powered hubs. I want
to set up some webcam security.
http://www.automatedhome.co.uk
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