Hello,
From: Cyril Scetbon <[EMAIL PROTECTED]> To: rami rosen <[EMAIL PROTECTED]> CC: [EMAIL PROTECTED] Subject: Re: Quickcam 4000 pro Date: Fri, 10 Sep 2004 07:55:40 +0200
rami rosen wrote:
Hello,
I had tried the logitech 4000 pro on Linux with the pwc and pwcx driver.
You get good results for a CIF image (352x288). The quality is much higher comparing to logitech quickcam.
I did not tried it against NetMeeting.
The SW I tried was mainly gnomemeeting.
Regarding the Audio : I had tried the built in microphone in this camera.
When you use a headset - the quality is reasonable.
When you try to use spekaers on both sides - there is an echo which becomes stronger during time (until it is simply unbearable shrike).
yeah, I noticed it :-( that's why I don't use the webcam speaker
Is it necessary to use skype for the sound combinate with gnomemeeting for the video or gnomemeeting manages both well ?
- Your question , If I understand you right, is regarding using GnomeMeeting for management of Audio and Video session and combining using Skype.
- As I wrote , if you use a headset on both sides the GnomeMeeting is OK for both.
- If you want to use speakers on both sides, and to use simultanously GnomeMeeting only for Video on both sides
and Skype for Audio on both sides , this can be an interesting idea.
- I did not try it yet. (I really intend to give it a try) ; I did find in the GnomeMeeting GUI that Video receive/transmit can be
disabled (there are check boxes for it in preferences) but I did not saw such check boxes for Audio.
I suppose it is not really a problem ; if it will disturb Skype transmit/receive audio (because trying to use the same audio device which GnomeMeeting uses),
it seems to me that you can configure GnomeMeeting to use faked audio
devices (in Preferences -> Devices->Audio Devices). (fore example, /dev/dsp2)
Anyhow, the Skype nework signalling layer is p2p.
GnomeMeeting nework signalling layer is the good old H323 (I heard about some
intentions to replace it in the future , in the GnomeMeeting project, with the more modern (and less cumersome) SIP (Session
Initiation Protocol) , which is commonly used nowadays in VoIP. But this can take quite a time
and does not change what is written in next paragraph:
If your question was regarding calling Skype from GnomeMeeting (or vice versa)
it seems that to due to this difference in the signalling protocol this is not easy ro implement
(NetMeeting , BTW , is based on H323 , and due to this , interconnection between
NetMeeting and GnomeMeeting is possible and implemented - though I did not test it ).
and , btw:
To be more accurate, GnomeMeeting has an Echo Cancellatrion feature if you use
special hw (QuickNet card) - you can see it also in Preferences -> Devices->Audio Devices
and in their documentation. I don't know the details (it could be that this is true only when
working against PSTN /special telephony equipment , etc.).
It's a pitty that there is no free/open source video conference Linux app with
Echo Cancellation (at least I didn't hear of such a project).
Regards, Rami Rosen
(BTW, this is a known phenomenon which happened to me also in NetMeeting but
it seems to me that on Skype the problem is really reduced; If I am not wrong they use
sw echo chacellation mechanisms of IPGlobal (which is commercial) and as I know
there is no OpenSource VideoConference projects with Echo Chancellation ; I had looked in GnomeMeeting newsgroup and
I saw that this probelm is with no real solution (except the advice to lower the speakers,
which not really helps).
And BTW, probably the sensor is very sensitive - (It is a SONY sensor l at least that is waht you can see in the kernel log) - the quality of this WebCam in almost total darkness in unbelievable.
I tried it on 2.4 mhz and also on 700 Mhz Intel machines and it seems enough horsepower for the codecs.
I also tried it with opensource ophone 1.4.1 http://www.openh323.org/code.html but the results are not as good as gnomemeeting.
Hope this helps, Rami Rosen
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