Skip navigation

Voice chat hics up during screensharing

700 Views 11 Replies Latest reply: Apr 27, 2013 1:46 PM by Ralph Johns (UK) RSS
Julius from Holland Calculating status...
Currently Being Moderated
Nov 8, 2012 6:14 AM

Hi all, since I did not find a special section for Messages, I post this question here. I am running a Mac Pro with Mountain Lion an Messages, my colleagues run 27" IMacs with Lion and IChat. When we share the screen it randomly happens that our voice chat in that session hics up. Sadly it is allways my voice with that problem so the only thing the other can do is to terminate my yo-yo-yo-yo and switch back to a normal chat. So I think I have to seek for the problem at my side and wonder if it could be a open ports thing or is it a bug in Messages? Anybody an idea?

 

Thanks in advance and kind regards, Julius

Mac Pro, Mac OS X (10.7.1)
  • Ralph Johns (UK) Level 9 Level 9 (66,815 points)

    Hi,

     

    In Messages and iChat the Screen Sharing is an Audio Only Chat+

    The Plus bit being an VNC connection for the Desktop part.

     

    It needs at least 128kbps as both Upload and Download speeds (the same as the minimum for 1-1 Video chats).

     

    If the setting in the App > Preferences > Video Section > Bandwidth Limit is set below 200kbps you will have problems.

    The same is true if for any reason the available portion of the internet connection does not give you that 128kbps.

     

    Lets say the upload you have is only 256kbps but you also share that connection with an iPhone and iPad and a games console that is doing On line games - then the Mac and Messages may not get the require amount of Bandwidth (It is not divided equally).

     

    Setting 500kbps in the Preferences is best.

    It is faster than the min needed to Host 4 way Video chats, It also drops the speed below issues of speed variances from the ISP.

    It also helps when the connection is shared.

     

     

     

     


    10:04 PM      Friday; November 9, 2012


    Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

     

      iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
     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

    "Limit the Logs to the Bits above Binary Images."  No, Seriously

  • Ralph Johns (UK) Level 9 Level 9 (66,815 points)
    Currently Being Moderated
    Nov 11, 2012 11:41 AM (in response to Julius from Holland)

    HI,

     

    One thing that can happen with very fast connections is that the "natural" variance in the speed of any one moment  can be too large for the buffering in iChat/Messages to cope with.

     

    Lets  say you are having a Video chat and have the Connection Doctor open (Video Menu)

    This will show you the live Bit Rate and Frame rate the app is achieving.

     

    If you then change the Bandwidth Limit to something like 200kbps you will see the bit rate change very slowly as the Buffering in the app smooths out the change.

     

    It tried to do this during a normal chat if the Speed is varying all the time.

    It does this by dropping frames until such point the audio will not be in sync and then Audio is dropped, leaving pics only.

     

    One thing to consider is whether any variances you and your Buddy are having are in sync.

    They could be getting faster whist your end is getting slower and exaggerating the change in speed.

     

    500kbps is fast enough to Host a 4 way Video chat.

    A 10Mbps service with a 5% variance is speed could be losing that same 500kbps in speed.

    If your Buddy has a similar speed and also varies by 5% there could be a 10% variance overall.

     

    Although I have spoken mostly about Video Chats here it seems that the VNC connection that shows you the desktop in the iChat Screen Sharing is more prone to stutter when the internet speed is less stable.

     

     


    7:41 PM      Sunday; November 11, 2012


    Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

     

      iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
     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

    "Limit the Logs to the Bits above Binary Images."  No, Seriously

  • Ralph Johns (UK) Level 9 Level 9 (66,815 points)
    Currently Being Moderated
    Nov 14, 2012 12:00 PM (in response to Julius from Holland)

    HI,

     

    The "Port Restricted" or other message about the router is about the way it does NAT (Network Address Translation.

    There are about 4 main ways of doing this and the iChat or Messages app will only go green when it can see a router doing what is called "Full Cone".

     

    This is unlikely to be the cause of the issue.

     

    You have a later version of iChat that does not use port 5060 for the SIP process (after your send the Visible Invite bit)

     

    There can be issues with some Firewire 400 to 800 adapters and the processing of the Mic's audio to the computer.

    However as you say it works well in Video chats and much higher speeds.

     

    As the Screen Sharing is on a random port with a Audio chat "Alongside" on the normal A/V port (port 16402 most likely) the audio should not stutter even when the Screen Sharing does something like playing a  Video.

     

    I am not sure there is anything left I can suggest.

     

     

    Sigcopy2.png
    7:59 PM      Wednesday; November 14, 2012


    Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

     

      iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
     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

    "Limit the Logs to the Bits above Binary Images."  No, Seriously

     

    Message was edited by: Ralph Johns (UK)

  • Ralph Johns (UK) Level 9 Level 9 (66,815 points)
    Currently Being Moderated
    Nov 15, 2012 12:15 PM (in response to Julius from Holland)

    HI,

     

    The White Screen issues is caused by the Apple Remote Desktop update to 3.6 at least.

    Some people report Black Screens and others the white (Although there is also a 3.6.1 update)

     

    Making both end have the same Display resolution seems to be the only work around at the moment.

     

    If an older computer is the one "apparently" sending the White Screen you can use Time Machine to backstep to an earlier version of the Apple Remote Desktop folder.

     

    Apple Remote Desktop provides the "Engine" for ichat's and Messages' Screen Sharing and also the Screen Sharing seen in System Preferences > Sharing and the Remote Management (which is Apple Remote Desktop) option that cannot be on at the same time as the Screen Sharing.

     

     

     

    Sigcopy2.png
    8:14 PM      Thursday; November 15, 2012


    Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

     

      iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
     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

    "Limit the Logs to the Bits above Binary Images."  No, Seriously

  • Ralph Johns (UK) Level 9 Level 9 (66,815 points)
    Currently Being Moderated
    Nov 19, 2012 11:57 AM (in response to Julius from Holland)

    Understood.

     

     

    Sigcopy2.png
    7:57 PM      Monday; November 19, 2012


    Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

     

      iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
     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

    "Limit the Logs to the Bits above Binary Images."  No, Seriously

  • Ralph Johns (UK) Level 9 Level 9 (66,815 points)
    Currently Being Moderated
    Apr 27, 2013 1:46 PM (in response to Julius from Holland)

    Hi Julius,

     

    Glad to hear you found a solution that works for you.

     

    Thanks for coming back and letting me know.

     

     

    3Sigcopy2.png
    9:46 PM      Saturday; April 27, 2013

     

      iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.3)
     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

    "Limit the Logs to the Bits above Binary Images."  No, Seriously

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.