Currently Being ModeratedNov 15, 2013 2:24 PM (in response to lensbaby)
Did he check his Audio ?
The most common issue is that the person not sending Audio has two or more options to use as Sound inputs and has changed the device in System Preferences > Sound > Input tab but not in iChat/Messages.
The next common is that the On/Off (Enable/Disable) in the Video menu is unticked (Off)
Next is he has used the Mute option.
However both ends tend to see an icon in the Video Chat indicating this.
During your next chat open the Connection Doctor in the Video menu.
Do this at both ends.
This will show you the Stats of the connection.
It will vary, but it should not vary too much.
The Buffering that is built into iChat/Messages will cope will variation of some 100 or so kbps.
It keeps in sync with the audio by dropping frames.
There does come a point where the dropping of frames means it is pointless to continue the Audio at which point it gets dropped.
It could be that the internet between you is varying too much
The green bars at the bottom will drop to yellow or red or disappear.
It could be that one end has changed Speed of it's Internet Service and is effectively brow beating the other end.
The solution to both these is to set the Bandwidth Limit in iChat Menu > Preferences > Video section. Bandwidth Limit Drop down.
You say you are on Snow Leopard (OS X 10.6.8)
If they are on Leopard or Lower they should also look at System Preferences > Quicktime and the Streaming tab and set this to 1.5Gbps T1/IntraNet/LAN as in this effects iChat 4.x.x (or earlier versions) (they should do Both)
iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
Currently Being ModeratedNov 17, 2013 12:02 PM (in response to lensbaby)