le lun 11-03-2002 à 23:49, pogosyan cita utoronto ca a écrit : > I want to add my problem to the sound discussion. > > I have Logitech 3000 Pro camera with Philips drivers, > use gnomemeeting 0.84.0, and was trying all oss, alsa-0.5.12 and > 0.9 drivers. Sound Hardware is C-Media PCI CMI8738 built in > chip on Asus motherboard. Microphone is one on the camera > (checked, works for recording). > > I try to connect with my friend running Netmeeting on his laptop. > Both of us are on office T3 lines > Video works fine, however sound does not. Namely > I have the following experiences > > 1) At first, I was using OSS drivers. On the connection > G.711-uLaw-64k was negotiated. My friend could hear me, > but I was hearing only cracking sounds. G.711 is a codec that requires lot of bandwidth. You should make your friend install the MS-GSM codec. and move MS-GSM as first codec in your codecs list (to give it the preference) > > 2) O'K, I thought, it is duplex problem, I'll use ALSA > (does my chip supports duplex at all, what should this > "cat /dev/dsp > /dev/dsp" test produce ?). You should hear yoursefl while you are talking without that this echo is hardware activated. If you don't hear yourself, or if you hear yourself with a huge delay, it is not full-duplex. However, it should not be a problem, because you can use the microphone of your webcam : simply choose /dev/dsp / /dev/mixer for playing and /dev/dsp1 / /dev/mixer1 for recording. In that case, no need for full-duplex. > So I tried ALSA 0.5.12a and 0.9.12. In the meantime > my friend moved from Toronto to Paris, but with the > same laptop. Now with ALSA, we could not get any > legible sound in any direction (I however did hear > pieces of his words). Seems to be a bandwidth problem. Are you trying to transmit 30 FPS with a good quality? You should lower both of them. > > 3) With him in France I tried to restore OSS driver > to get at least one directional sound, but now it did not > work ! > > 4) My friend seemed to have MS-GSM module, but we could not make > a connection to use it (I tried to disable everything but this > module). Maybe it was not exactly the module > needed ... If you disabled everything but MS-GSM and that it is not using it, then, your friend obiously did not install that codec. > > > I'd like to find out how could I check if Full duplex works with > my card, and what else I should be thinking about. > You do not need full-duplex if you are using your webcam built-in microphone (/dev/dsp1). > > Thanks in advance, Dmitri > > _______________________________________________ > Gnomemeeting-list mailing list > Gnomemeeting-list gnome org > http://mail.gnome.org/mailman/listinfo/gnomemeeting-list > > -- _ Damien Sandras (o- GnomeMeeting - H.323 Video-Conferencing application - //\ web: http://www.gnomemeeting.org/ v_/_ FOSDEM 2002 - Free Software and Open Source Developers Meeting - web: http://www.fosdem.org/
Attachment:
signature.asc
Description: This is a digitally signed message part