Re: VideoLogic Captivator results so far on the PC platform

Joseph Kahan (jkahan@PHOENIX.PHOENIX.NET)
Wed, 10 May 1995 21:18:45 -0500 (CDT)


Pertaining to your questions about CU-SeeMe over a couple of 14.4 or 28.8
K modems, I have done hours of tests and the best that I have been able
to get is a steady 14.4 or 28.8 K stream. This is because your modem
compression doesn't work very effectively against already compressed data
such as CU-SeeMe audio and video data packets.

I am using modems with Rockwell chips and I have read that modems with
Motorola chips do a little better.

A little sunshine :-) I have noticed that after about 30-45 minutes of a
steady connection, data rates for video transfer will increased up to
about 35 kbps.


On Wed, 10 May 1995, John Faherty 10-May-1995 2004 -0400 wrote:

> Ok, PC community, I've tried the VideoLogic Captivator board (not the Pro/TV
> board - $ 99.00 directly from VideoLogic - 800-578-5644), with CU-SeeMe,
> Microsoft Video for Windows 1.0 and 1.1, and VideoLogic's VideoSnap application,
> on the following platforms, all without a single installation or usage problem
> so far:
> Packard Bell Legend 2000, 486/25, 8mb Memory, Windows for Workgroups 3.11,
> Trumpet 2.0B
> Digital 466D2LP, 486/66, 16mb memory, Windows for Workgroups 3.11, Microsoft's
> Wolverine IP stack
> Digital 466D2LP, 486/66, 16mb memory, Windows95 final beta, Windows95 IP stack
> Digital 450D2MT, 486/50, 32mb memory, Windows for Workgroups 3.11, Microsoft's
> Wolverine IP stack
> If anyone wants further information on the above configurations (e.g. - what
> BIOS are you running, what's your video setup, ...), drop me an e-line.
> A couple of P.S.'s (one related to this subject, the other not):
> 1) For those of you on PC's anxious to get started using CU-SeeMe both as
> a sender and receiver, keep in mind that Connectix is due to begin shipping
> their QuickCam for the PC at the end of this month. The QuickCam is a
> Digital Camera which captures in black and white, plugs directly into a
> 16550 UART serial port, and has a proven history with CU-SeeMe on the Mac.
> No need for a capture board, surgery on your PC to install said board, or a
> separate, sometimes expensive video source (e.g. - CamCorder). The MSRP on
> the QuickCam is $ 149, with a likely retail price of ~ $ 100 - 130.
> Unless you really have to get going with CU-SeeMe now, I'd wait until
> the QuickCam for the PC ships, and someone on this list (I plan on buying a
> couple :-) buys, tests, and reports the results of using the QuickCam for
> the PC with CU-SeeMe for the PC.
> 2) Off the main subject, every time I've seen discussions on this list about how
> CU-SeeMe will operate over a modem at various speeds, the speeds discussed
> have been 9,600, 14,400, and 28,800. Is anyone out there aware that if
> you've got a 14,400 V.32 or 28,800 V.34 or V.FC modem, you can really
> do 57,600 max (in the case of the 14,400 modem) and 115,200 max (in the
> case of the of the 28,800) by using the compression capabilities of the modem
> (e.g. - in the case of the V.34/V.FC modem being used with Trumpet, simply
> tell Trumpet to operate at a baud rate of 115,200). This of course presumes
> that the receiving modem can handle the same modem protocols as the sender
> (and the phone connection isn't noisy :-(. In the case of the V.34/V.FC modem,
> that's getting pretty close to 2 channels on a T1 circuit (128 KBS). The only
> part I'm not sure about is whether the compression capabilities of the modem
> make much of a difference when CU-SeeMe's UDP data stream is involved ? Can
> someone shed some light on that question.
> Regards,
> John Faherty
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