Troubleshooting Guide for the Mbone Tools

Audio Problems and Solutions

You seem to be the only person in the conference

- i.e. only your name appears in the Main RAT Window.
 
Maybe you are the only one in the conference.

If you are sure that other people should be there, check (using a phone or email) that you are both using the same address/port combination and that the TTL is large enough.

You canít hear other people.

Make sure that the leftmost mute button is not pressed down.

Make sure that someone is actually talking. You can see that someone is talking when the leftmost of the two power meters in the RAT audio window is going up and down.

Make sure that the incoming volume is turned up (i.e. larger than 0). The volume can be adjusted on the slider bar next to the leftmost power meter.

If you are using a PC, make sure the audio panel settings are correct.

If you are using a Unix workstation, make sure that the icon above the mute button is depicting headsets, speakers or line out depending on what you are using.

Check that your headsets/speakers are plugged in computer correctly.

You can hear other people, but (some of them) not very well.

If their audio is too faint, ask them to turn up their volume.

If their audio is very broken up, ask them to turn off silence suppression in the options menu, which you get by pressing Options in the RAT audio window.

If their audio is distorting, ask them to turn their volume down.

The audio from everybody keeps cutting out

The most likely causes of this are either network congestion, or because the other user is speaking too quietly for the audio tool to distinguish them from the background noise. You can check if you are receiving packet loss from another participant by clicking on their name in the Main RAT Window. A small window will appear. The last line in this window will tell you how much packet loss (instantaneous Loss Rate) you are receiving from that participant. Packet loss can be reduced by ensuring that all participants use redundancy, i.e. DVI is selected as both primary and secondary encoding in the RAT Options Window. (This does not always apply, please refer to the RAT user guide).

If the packet loss is small, i.e. less than 5%, ask them to turn their volume up.

If that does not help, ask them to turn off silence suppression (this option is available from the Options window, accessible from the RAT audio window).

If you keep on moving windows around on the screen, the processing power of the computer will be spent on window management rather than audio decoding, and you will loose out on the audio. Donít move windows around.

Other people canít hear you.

Make sure that your microphone is unmuted when you talk. The microphone is unmuted when the rightmost of the two mute buttons in the RAT audio window is not depressed. The microphone icon immediately beneath the mute button will be greyed out when muted and not greyed out when unmuted. There is two ways of doing unmuting the microphone.

Push to talk: Press the right mouse button with the cursor inside the RAT audio window. This will unmute the microphone for as long as you keep the mouse button pressed down. You must press the mouse button and keep it down for as long as you are talking.

Open microphone: Press once on the rightmost mute button. They microphone icon should no longer be greyed out. The microphone is now permanently open.
Check that your microphone is plugged in correctly.

You cannot chance your name.

Make sure that you hit the return key on the keyboard after you have made the desired changes in the name field in the RAT Options Window.

How to check if microphone and headphones/speakers are working without remote participants being present.

You can check that the microphone is working by recording a short message using a recording application.

You can check that the headphones/speakers are working by playing out a local .wav file or music CD.

Video Problems and Solutions

You seem to be the only person in the conference

- i.e. only your name appears in the members list which you get by clicking on the Members button at the bottom of the Menu Window. Note that even if you cannot see any pictures, it doesn't mean that nobody is in the conference - that just means that nobody is transmitting video.

Maybe you are the only one in the conference.

If you are sure that other people should be there, check (using a phone or email) that you are both using the same address/port combination and that the TTL is large enough.

You canít see a picture of yourself.

Make sure that your are transmitting. There should be a little red square on the Transmit button in the menu which you get by pressing the Menu button in the VIC video window. If not, press Transmit.

Make sure that the VIC video window is large enough to accommodate all the pictures. You can enlarge the VIC video window by dragging the window bigger.

Make sure that the cameraís power supply is plugged into the mains (when applicable) and that the camera is connected to the computer.
You can check that the camera is working through a capture device application.

Your picture looks strange (fuzzy).

Press on Menu button in the Main VIC window. Then press the release button. Then press the transmit button. (This phenomenon happens if you begin transmitting before the camera is plugged in/turned on)

VIC keeps crashing (PCs only).

Once VIC has crashed, you need to reboot (yes, reboot) your PC in order to be able to transmit again. VIC is liable to crash if you begin transmitting before the camera is plugged in and turned on.

You cannot chance your name.

Make sure that you hit the return key on the keyboard after you have made the desired changes in the name field in the VIC Menu Window.

WB Problems and Solutions

You seem to be the only person in the conference

- i.e. only your name appears in the Participants list in the separate control panel window.

Maybe you are the only one in the conference.

If you are sure that other people should be there, check (using a phone or email) that you are both using the same address/port combination and that the TTL is large enough.

The toolbar has disappeared

Make sure that the Receive Only option in the WB control panel is not ticked. The WB control panel is in a separate window.

You are trying to import PostScript files, but they don't appear

Your PostScript file may be too big. By default, the maximum size PostScript files that can be imported into WB is 32000 Bytes. The best solution is to compress your PostScript files to be as small as possible. Alternatively, you can override the default file size to be up to 1 MB (see user guide for how to do this). Note however that you must start WB from the command line (i.e. not from SDR) in order to do this.

Nothing appears on the screen when you try to write or draw

check that one of the top five icons in the right hand side of the WB have been selected  and check that the colour you are writing with is different from the background colour.

WBD Problems and Solutions

You seem to be the only person in the conference.

Maybe you are the only one in the conference.

If you are sure that other people should be there, check (using a phone or email) that you are both using the same address/port combination and that the TTL is large enough.

Nothing appears on the screen when you try to write or draw

Check that the button labelled with a capital T is selected if you want to type or that the button labelled with a feather is selected if you want to draw, and check that the colour you are writing with is different from the background colour.

NTE Problems and Solutions

You seem to be the only person in the conference

- i.e. only your name appears in the Participants list in the right hand side of the Main NTE Window - if you can't see the Participants list, select Show then Participants.

Maybe you are the only one in the conference.

If you are sure that other people should be there, check (using a phone or email) that you are both using the same address/port combination and that the TTL is large enough.

Text is truncated when imported into NTE

By default NTE can only import text files up to a certain size. You can either split the text up into smaller chunks which you import separately, or you can override the default file size (see NTE user guide's box on NTE Command Line Options). Note however that you must start WB from the command line (i.e. not from SDR) in order to do this.



Created by Louise Clark on 25 November 1998. Please email comments about this page to ucl-userguides@cs.ucl.ac.uk