This computer doesn't support video chats

This is the information my iMac shows when I want to call friends.  Next to my picture the Audio image is showing.  Until yesterday it worked perfectly.
Even now I can video chat on Skype or FaceTime.  But no Messages anymore.  What is wrong?

Hi,
On starting up the app it make a check on whether it can see enough Internet Speed to do Video chats.
If the app is started when the computer is the network may not be established when the check is made.
Sometimes the computer is busy establishing links over the network not leaving enough for Video chats.
Other computers or Games Consoles that might be doing Downloads can also effect what speed (or portion (Bandwidth) of the connection) can be seen.
Try restarting the app.
If that does not work try shutting down the app and then restarting the computer before restarting the app.
If that fails do this:-
Shut the app down.
Open Terminal (Applications/Utilities)
Copy the Bold text below and paste it in Terminal and hit the enter key.
/Applications/Messages.app/Contents/MacOS/Messages -errorLogLevel 7
This will launch from Terminal and create a log whilst doing so.
The Log will pause once the Buddy lists have logged in (AIM, Jabber or Yahoo accounts).
The Log will show the CommNAT settings at the bottom.
Like this:
External Ports: 16403, 16403, 16403
CNAT_BADTEST ....... 0
CNAT_ISFULLCONE .... 0
CNAT_ISPAT ......... 0
CNAT_ISPATHOST ..... 0
CNAT_TRYPRESERVE ... 1
CNAT_PATINORDER .... 0
CNAT_BLOCKIP ....... 1
CNAT_BLOCKPORT ..... 1
CNAT_LOOPBACK ...... 0
At this point Quit Messages in the normal way.
Copy the bits of the Log that state the Bandwidth (BDW)
I have the setting in Preference > Video > Bandwidth Drop set to 500 so mine looks like this
195919.490273 BWD: cache: 73:16 too old
195919.490284 BWD: Using QuickTime value: 500000
195919.490292 BWD bandwidth: 500 kbits up, 500 kbits down.
It lists it in bytes and adjusts to kilobytes.
Anything below 128kbps is unlikely to support Video.
Not the upload as well as download speed.
You can now quit Terminal.
Also check what speed you are getting
http://speedof.me/
10:00 pm      Monday; December 16, 2013
  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

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