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multimedia:web_conferences_with_bigbluebutton:faq_about_bigbluebutton [09:14 23. March 2022 ] Stefanie Zegowitzmultimedia:web_conferences_with_bigbluebutton:faq_about_bigbluebutton [14:55 24. January 2024 ] (aktuell) – [How can I change the layout of the BBB interface?] Hans-Ulrich Kiel
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-====== FAQ - Web Conferences with BigBlueButton ======+====== FAQ - BigBlueButton ====== 
 [[multimedia:webkonferenzen_mit_bigbluebutton:faq_qanda|deutsche Version]] [[multimedia:webkonferenzen_mit_bigbluebutton:faq_qanda|deutsche Version]]
-=== Which browser do I use optimally for video conferences with BBB? === 
-We receive constantly changing reports on our experiences almost every day. We can therefore only recommend that you test the browser of your choice and change your browser if there are any errors. 
  
-=== I would like to record my meeting/event === +==== Which browser works best with BBB? ==== 
-Recording of conferences on the BBB server is not provided and is technically disabled.\\ + 
-For lectures, the recording of the lecture in classroom is available as usual (lecturer and slides in OpenCast)For the development of dynamic lecture materials (on screen, for examplePowerPoint slides with insertions and annotations in the video, parallel to audio explanations by the lecturer), the computing center offers licenses from Camtasia for screen recordingPlease send us an e-mail for the allocation of a license to [[support@rz.tu-clausthal.de|support@rz.tu-clausthal.de]]+Since Google Chrome browser offers the best support for BBB on all operating systems (except Apple iOS), we recommend using Chrome or another Chromium-based web browser for BBB conferences.   
 + 
 +==== Why is it not recommended to use Firefox? ==== 
 + 
 +BBB is based on WebRTC. There are a few issues with the implementation in firefox which can negatively affect the quality of the conference:  
 +  * The volume of the microphone is not automatically regulated. Therefore, the audio transmission of individual participants can be either too loud or too quiet.    
 +  * Webcam images and audio transmission may not be in sync.   
 +  * Firefox always uses the default output device (speakers) of the operating system. It is not possible to manually set the output device. 
 +  * Images of presentations may lag. 
 +  * The quality of transmission is reduced when sharing your screen.  
 + 
 + 
 +==== What internet connection do I need for using BBB? ==== 
 + 
 +Real-time audio and video transmissions place significantly higher demands on network connections than regular websites.  Therefore, it is recommended to use a wired network connection instead of WiFi, if possible.  You can test the speed of your network connection at [[https://speedtest.rz.tu-clausthal.de/]]. For a stable connection, you need to have the following minimum results:  
 +  * Download > 10 Mbps 
 +  * Upload > 2 Mbps 
 +  * Ping < 100 ms 
 +  * Jitter < 20 ms 
 + 
 + 
 +==== Which webcam do you recommend? ==== 
 + 
 +Current laptops are usually equipped with good webcams. However, when using a PC or external monitor, then a separate webcam is needed. The computing centre recommends the following Logitech webcams for individual work stations: model "Brio 500" and model "Brio Ultra-HD Pro" for advanced users. For an optimal setup, please install the associated software [[https://www.logitech.com/de-de/video-collaboration/software/logi-tune-software.html|Logi Tune]]. \\ 
 + 
 +Note that webcams for individual work stations are not sufficient for the use in meeting rooms. Please contact the computing centre for advice on how to best equip your meeting room with video conferencing technology.  
 + 
 + 
 +==== Can I upload my own virtual background? ==== 
 + 
 +From version 2.6 of BBB, you can upload your own images to be used as a virtual background. This can be done by clicking on the white check mark next to the camera icon, scrolling to the right under the „Virtual background settings“ section and then selecting „Upload from device“. Uploaded images are stored in your web browser's local storage and are available for future use when using the same PC.  
 +==== I would like to record my meeting/event. ==== 
 + 
 +At present, it is not possible to record meetings or events on the BBB server at TU Clausthal. To record a lecture in a lecture hall, please use the Opencast system. To create your own lecture video using screen recording on a PC, the computing centre offers a license for Camtasia. See [[multimedia:camtasia:start]] for more information. 
 + 
 + 
 +==== BBB does not initially display a slide. ==== 
 + 
 +When we switched to BBB version 2.4, we decided to hide the start-up slide. This is because most participants are already familiar with BBB. By clicking the presentation button {{:multimedia:webkonferenzen_mit_bigbluebutton:button_praesentation_off.png?30}}, individual participants can view the start-up slide, if needed \\  
 + 
 +The start-up slide appears automatically for all participants when the presenter changes slides or zooms.  \\ 
 + 
 + 
 +==== How can I change the layout of the BBB interface? ==== 
 + 
 +BBB version 2.4 introduced choice of layouts. The default layout is the "Smart layout" which automatically arranges the layout of the webcam images and presentationVia the settings menu {{:multimedia:webkonferenzen_mit_bigbluebutton:menue.png?30}}, you can switch to "Custom layout". This layout lets you adjust the size and position of each section in the browser window.  
 + 
 +==== When sharing my screen, the size of my webcam image is reduced.  ====  
 + 
 +Shared images are shown to the presenter in reduced size to avoid video loops and their resulting high data usage. If needed, they can be expanded to full size via the full screen icon {{:multimedia:webkonferenzen_mit_bigbluebutton:fullscreen-bbb-t.png?30}} at the top right of the image. 
 +==== How many rooms can I create in BBB? ==== 
 + 
 +Via [[https://webconf.tu-clausthal.de/|Webconf]], each user can create as many rooms as they wish.  
 +==== I am organising a larger event. How many participants can partake in BBB? ==== 
 + 
 +Based on our own experience and those from other universities, we expect meetings with one to three presenters and approximately 500 listeners to be possible without any problems. It is further possible to have meetings with more than 50 participants who all use video. As the number of participants increasesthe webcam resolution, refresh rate, and data rate are automatically reduced. This prevents overloading end devices. Once the number of participants reaches 16*, BBB changes to a page-by-page display (*32 for moderators)
 + 
 + 
 +==== Is it possible to get an exclusive server for a BBB event? ==== 
 + 
 +When we started using BBB in 2020it was not always very reliable and efficient. In addition, there was little experience with hosting larger events. Because of that, we had exclusive servers for important BBB events in a so-called VIP environmentSince then, BBB has significantly improved. In March 2022, we consolidated and unified the BBB server environment. We now have 12 equally strong BBB nodes across which all sessions are automatically distributed. Based on our utilization measurements over several months, we consider this environment to be sufficiently stable and efficient so that exclusive BBB servers are no longer needed.   
 + 
 + 
 +==== I would like to upload a presentation but I keep getting an error message. ==== 
 + 
 +If possible, please upload files using PDF format. PDF files should be a maximum of 200 pages long, have a maximum size of up to 30 MB, and their conversion should take a maximum of five minutes. If necessary, please split your files into several parts and upload them one by one.  
 + 
 + 
 +==== The presentation I uploaded looks different fonts are incorrect and image errors are displayed. ==== 
 + 
 +When uploading MS Office files such as Word or PowerPoint, BBB automatically converts these files to PDF format using LibreOffice. Because of this, it is possible that fonts, symbols, drawings, and formatting are affected. Animations are typically not supported. Please convert any files to PDF format using the programme in which they were created, and check your results prior to uploading. If content or animations are missing, you can use screen sharing for the presentation instead.  
 + 
 + 
 +==== The voice quality varies greatly - sometimes individual participants cannot be understood at all. ==== 
 + 
 +The sound quality heavily depends on the quality of microphone being used. If several participants speak at the same time, it becomes incomprehensible. Therefore, we recommend to turn microphones off when not speaking. Background noises may also cause disruptions. As participants often do not notice these themselves, please inform them discreetly. In addition, it is recommended to use Google Chrome as it has shown to produce more balanced volume.  
 + 
 + 
 +==== I keep experiencing dropouts in audio and video. ==== 
 + 
 +Real time audio and video transmissions place a significantly higher demand on the quality of network connections and performance of end devices than regular websites. This means that audio and video dropouts are typically the result of an unstable network connection or an overloaded PC, so please check your CPU utilization and your network connection. It is recommended to use a wired network connection instead of WiFi, if possible.  You can test the speed of your network connection at [[https://speedtest.rz.tu-clausthal.de/]]
 + 
 + 
 +==== Is the transmission quality worse when using VPN? ==== 
 + 
 +The transmission quality was reportedly worse when using VPN. Therefore, it was initially recommended to disconnect all VPN connections before joining a BBB conference. However, the optimization of the VPN Server on July 15, 2022, eliminated this problem. This means that VPN can now be used for all video conferences.  
 + 
 + 
 +==== I cannot enable the microphone or camera as described in the instructions. ==== 
 + 
 +In order to enable audio and video transmissions on your PC, you must first activate the webcam and microphone via the Windows Control Panel. Then you have to grant your browser permission to access them. If you have accidentally turned off permission, then you must first undo this as described in the instructions.  
 + 
 + 
 +==== Firefox does not detect any output device (speakers). ==== 
 + 
 +Firefox cannot automatically detect and switch output devices. It uses the default device of the operating system. If the output device of the operating system is correctly set up, then the audio output will work regardless of Firefox claiming that no device was found. However, we recommend using Google Chrome instead of Firefox.  
 + 
 + 
 +==== BBB uses a different audio device than intended. ==== 
 + 
 +You can change audio devices by clicking the white check mark next to the microphone icon. It is also possible to set default audio devices in Windows by right-clicking the speaker icon on the taskbar and then opening the sound settings. The browser should then automatically use your default devices. \\
  
 +Note that your default devices may be unintentionally changed due to the sequence in which they are switched on, reconnecting devices or driver updates. Therefore, we recommend to disable any unwanted devices in Windows via “manage audio devices”.
  
-=== How many rooms can I create and share with others? === 
-Ten rooms can be created per user.  
  
 +==== It is difficult and confusing to react to feedback during a lecture. ====
  
-=== The quality of the image transmission is not good enoughe.g. when using a document camera === +During a lectureit is recommended to have an assistant who can observe chat messages and take care of participants
-The BBB conference system is designed to enable video conferences (= webcam showing a participant) in adequate quality. Screen sharing, i.e. the transmission of screen contents/windows of programs, is also part of the platform. Webcam images are moving images of medium quality, while screen sharing mainly involves high-quality motionless images. The use of a document camera represents a hybrid ( = actually static contents, which are however played in via a camera), with which quality losses cannot be excluded.+
  
  
-=== I want to upload a presentation, but there is an error === +==== How do use BBB in my courses? Or how do I invite the students to my BBB room? ====
-The uploaded PDF files must not exceed 200 pages, the file size is limited to 30 MB and the conversion of the document on the server must not take longer than five minutes. If necessary, please split your files to be uploaded and publish them one by one.+
  
-=== The uploaded presentation looks different - fonts are not correct, images have errors === +BBB is integrated into Stud.IP and Moodle via plugins. Please use either LMS to create and configure a BBB room for your courseSee [[multimedia:webkonferenzen_mit_bigbluebutton:studip|]] and [[multimedia:webkonferenzen_mit_bigbluebutton:moodle|]] for further instructions.
-Uploading a presentation in a format other than PDF is not reliable: When uploading a file in a format other than PDF, a conversion is performed by BBB, fonts, symbols and drawings can be changed, animations are usually not transferred. Please export your presentation from the program into a PDF file with which you created the presentation and check the result before using the fileThen upload the checked and if necessary corrected PDF file into the BBB room.+
  
  
-=== Drawings on a presentation uploaded by me appear blurry/shaky/corrected === +==== How can I use BBB in lecture halls and seminar rooms? ====
-Depending on the size of the document used (length and width/resolution), there may be visible changes to drawings in smaller documents - especially when using a graphics tablet or pen display. For drawings or detailed writing, please use a large file as "canvas" if necessary.+
  
 +In large lecture halls at TU Clausthal, provisions have been made to transfer lectures from a PC to BBB. Audio transmissions from the audience are only possible to a limited extent. See [[multimedia:webkonferenzen_mit_bigbluebutton:bbb_im_hoersaal]] for more information. \\
  
-=== It is difficult and confusing to react to feedback from the participants in a lecture === +Seminar rooms often do not supply fixed audio equipment. To use BBB in seminar rooms, you can hire audio equipment from the equipment loan service in the computing centre. Againaudio transmissions from the audience are only possible to limited extent and questions may have to be repeated by the speaker\\
-During an event, the lecturer should give lecture and an assistant should monitor the chat as well as supervise the technical settings and prepare surveys, for example. In principle, it can be worth asking questions about speed and comprehensibility in the meantime.+
  
 +Some rooms, such as the Senate Meeting Room (A1-177) and the seminar room in the computing centre (B5-119), are equipped with microphones which allow audio transmissions without restrictions. 
  
-=== I have a larger event, how many participants can BBB handle? === 
-The BBB server is primarily intended for the coordination of working groups and for courses in small groups with the active participation of students. Seminar presentations are also imaginable in this context. To what extent an event including interaction with the audience in groups of more than twenty people is technically stable is not yet reliably known. The computer center has not configured an upper limit. However, it is to be expected that low-performance PCs of individual participants will be overstrained if too many video images are transmitted. This is shown by picture and sound disturbances among the affected participants. Restrictions may need to be made (e.g. not all participants should activate their webcam at the same time, reduce the quality of the transmission, etc.) 
  
 +==== How can I transfer images from a visualizer? ====
  
-=== The voice quality fluctuates greatly, sometimes individual participants cannot be understood at all === +If a PC has multiple video sourcessuch as a webcam and a visualizer, then it is possible for BBB to transmit two video images at the same timeFrom BBB version 2.7the function "Camera as contentcan be used to display the visualizer image instead of the presentation with resolution of 1920×1080 at 30 frames/sUnfortunately, this means that data will be compressed which leads to loss of quality. Therefore, the display of detail is limited  
-In video conferencesthe general rule is that the simultaneous speech of several participants becomes unintelligible to allFor conferences with several participantsall microphones should therefore normally be set to "MUTEand the conference should be led by moderator who lets you speak when notifiedBackground noise and feedback from inadequate microphones can have significant disturbing effect.+
  
  
-=== Occasional dropouts in audio and/or video === +==== In breakout roomsstudents should use more than one slide to jointly create a presentation====
-We are aware of individual cases in which an activated VPN connection may have led to interruptions / dropouts of video and/or audio streams. Despite intensive investigationwe could neither prove this nor find the cause - nor could we prove the contrary. We therefore recommend that in the event of an error, conferences should be held without an active VPN connection.+
  
 +In breakout rooms, BBB provides only one page on the whiteboard. It is therefore recommended that students create presentations using several blank pages and uploading them to the breakout room. 
  
-=== How do I use BBB in my lectures or how do I invite students to my BBB room? === 
  
-An integration in Stud.IP is already availablean integration in Moodle is in the process of organizational discussion and technical testing.+From BBB version 2.6it is possible to transfer the results from breakout rooms to the main room via PDF files. This option must be selected when creating breakout rooms. The PDF files are then available to the presenter via the plus button once the breakout rooms close.  
 +==== The playback of videos from the TU Clausthal video server does not work====
  
 +Unfortunately, the playback of videos from the TU Clausthal video server via the “external video” function in BBB is currently not supported. An exception are videos which are uploaded with an additional option: [[multimedia:webkonferenzen_mit_bigbluebutton:videos_einbinden|]]
  
-=== BBB does not work properly in Rocket.chat/when I open a BBB conference via the chat server === 
-Depending on the browser you are using or the Rocket.chat client, difficulties may occur. Preferably please use the systems chat.tu-clausthal.de and the BBB server webconf.tu-clausthal.de independently of each other: The integration of the BBB server in the rooms of the chat server is not fully compatible with all browsers. 
  
 +==== In a meeting with external partners, some cannot join the BBB room. ====
  
-=== I cannot share my microphone or camera in the browser as described in the manual === +Some companies and countries (for example, China) have sealed themselves off with firewalls in such a way that it is not possible to establish a connection to the BBB server at TU Clausthal. The website then still loads but audio and video connections fail. You can ask your external partner if they can set up a meeting room on their video conference platform, or elseyou can contact the RZ support team for an alternative 
-The webcam and microphone must be enabled both in the Windows Control Panel and in the browser to enable audio and video transmissions from your own computer. Thereforeplease also check in the system settings whether these devices can be enabled.+
  
  
-=== When using BBB with your smartphone, it will warm up significantly and the battery will discharge very quickly === +==== How can I switch BBB to English? ====
-Mobile devices like smartphones need a lot of energy/get warm when used in video chat. Please ensure that charging facilities are available/provide the appropriate power supply unit. If necessary, please remove an additional cover and place the device e.g. with the long side facing away from you on a book so that it does not lie flat on the table: Firstly, it allows you to see and be seen better, and secondly, the smartphone or tablet can better transfer the heat generated to the ambient air and is better cooled.+
  
 +BBB is, by default, displayed in the same language as your browser. You can change the language via “settings” in the main menu of BBB. 
  
-=== How can I switch BBB to English? === 
-BBB works completely in English if your own browser is installed in the English language version or the "preferred language" in the settings is "English". 
  
-=== The students should use more than one Slide to work together in the Breakout Room ===+==== The answer to my question is not listed above. ====
  
-Recommend your students to create a presentation with a couple of empty slides (or make presentation like this available for download in the Moodle course / Stud.IP course) and upload it to the Breakout Room. +If your web browser or connected device malfunctions, then restarting your browser or PC often helps. If you use browser other than Google Chrome, you can check if using Google Chrome solves the problemIf you are experiencing any other problems, please contact the RZ support team for help and indicate which operating system and web browser you are using as well as the time and URL of the meeting. In case audio and video transmission problems, please add your connection status from BBB and the results from [[https://speedtest.rz.tu-clausthal.de/]].
-The results of the work with the whiteboard function cannot currently be saved and are also not taken into the main roomPlease inform your students that they may document their work with a screenshot.+
  
-=== I have an unlisted error, which is not listed here === 
-For errors of any kind: Please check whether a logout from the BBB server and, if necessary, a restart of your computer can help with sound or transmission problems. Especially when several conference rooms are used in quick succession or the microphone/loudspeaker combination is changed in the meantime, unexpected situations can occasionally occur. The easiest way to fix them is to reboot, with all audio devices that will be used later already connected. 
  
 {{tag>[mitarbeitende] [studierende] [doku_en]}} {{tag>[mitarbeitende] [studierende] [doku_en]}}
multimedia/web_conferences_with_bigbluebutton/faq_about_bigbluebutton.1648023277.txt.gz · Zuletzt geändert: 09:14 23. March 2022 von Stefanie Zegowitz

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