Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- multimedia:web_conferences_with_bigbluebutton:faq_about_bigbluebutton [16:03 15. April 2020 ] – qn17
+++ multimedia: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
@@ Zeile 1: / Zeile 1: @@
-====== FAQ/Q&A about BigBlueButton ======
+====== FAQ - BigBlueButton ======
-=== Which browser do I use optimally for video conferences with BBB? ===
+[[multimedia:webkonferenzen_mit_bigbluebutton:faq_qanda|deutsche Version]]
-Preferably, please use Mozilla Firefox; we have not received any requests for difficulties with this, and the product is also regularly used in the data center by employees for conferences via BBB, so that the greatest experience is available.
-\\ \\
-At present (as of 31.03.20) we have reported difficulties in using the Safari browser under MacOS. One workaround is the installation of Firefox for Mac; we are not yet aware of any other ways to fix the problem.
-=== 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 a classroom is available as usual (lecturer and slides in OpenCast). For the development of dynamic lecture materials (on screen, for example: PowerPoint slides with insertions and annotations in the video, parallel to audio explanations by the lecturer), the computing center offers licenses from Camtasia for screen recording. Please 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.
-=== How many rooms can I create and share with others? ===
+==== Why is it not recommended to use Firefox? ====
-Ten rooms can be created per user.
+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.
-=== The quality of the image transmission is not good enough, e.g. when using a document camera ===
-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.
+==== What internet connection do I need for using BBB? ====
-=== I want to upload a presentation, but there is an error ===
+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:
-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.
+  * Download > 10 Mbps
+  * Upload > 2 Mbps
+  * Ping < 100 ms
+  * Jitter < 20 ms
-=== It is difficult and confusing to react to feedback from the participants in a lecture ===
+==== Which webcam do you recommend? ====
-During an event, the lecturer should give a 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.
+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]]. \\
-=== I have a larger event, how many participants can BBB handle? ===
+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.
-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.)
-=== The voice quality fluctuates greatly, sometimes individual participants cannot be understood at all ===
+==== Can I upload my own virtual background? ====
-In video conferences, the general rule is that the simultaneous speech of several participants becomes unintelligible to all. For conferences with several participants, all microphones should therefore normally be set to "MUTE" and the conference should be led by a moderator who lets you speak when notified. Background noise and feedback from inadequate microphones can have a significant disturbing effect.
+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. ====
-=== Wie nutze ich BBB in meinen Lehrveranstaltungen bzw. wie lade ich die Studierenden in meinen BBB-Raum ein? ===
+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.
-Eine Integration in Stud.IP ist bereits verfügbar, eine Integration in Moodle ist in der organisatorischen Diskussion und der technischen Prüfung.
+==== BBB does not initially display a slide. ====
-=== BBB funktioniert nicht richtig im Rocket.Chat/wenn ich eine BBB-Konferenz via Chat-Server öffne ===
+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.  \\
-Hier gibt es in Abhängigkeit des eingesetzten Browsers bzw. beim Rocket.Chat-Client Schwierigkeiten. Bevorzugt nutzen Sie bitte die Systeme chat.tu-clausthal.de und den BBB-Server webconf.tu-clausthal.de unabhängig voneinander: Die Integration des BBB-Servers in den Räumen des Chatservers ist nicht in allen Browsern uneingeschränkt nutzbar.
+The start-up slide appears automatically for all participants when the presenter changes slides or zooms.  \\
-=== Ich kann im Browser nicht wie in der Anleitung beschrieben Mikrofon oder Kamera freigeben ===
-Webcam und Mikrofon müssen sowohl in der Windows-Systemsteuerung als auch im genutzten Browser freigegeben sein um Audio- und Video-Übertragungen vom eigenen Rechner zu ermöglichen. Bitte prüfen Sie daher auch in den Systemeinstellungen, ob diese Geräte freigebbar sind.
+==== How can I change the layout of the BBB interface? ====
-=== Bei der Nutzung von BBB mit dem Smartphone wird dieses spürbar warm/entlädt sich der Akku sehr schnell ===
+BBB version 2.4 introduced a choice of layouts. The default layout is the "Smart layout" which automatically arranges the layout of the webcam images and presentation. Via 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.
-Mobile Endgeräte wie Smartphones benötigen viel Energie/werden warm bei der Nutzung im Videochat. Bitte sorgen Sie für Lademöglichkeiten/legen Sie das zugehörige Netzteil bereit. Gegebenenfalls entfernen Sie bitte eine zusätzliche Hülle und legen Sie das Gerät z.B. mit der von Ihnen abgewandten langen Seite auf ein Buch, so dass es nicht flach auf dem Tisch aufliegt: Erstens können Sie so besser sehen und gesehen werden, zweitens kann das Smartphone oder Tablet die entstehende Wärme besser an die Umgebungsluft abgeben und wird besser gekühlt.
+==== When sharing my screen, the size of my webcam image is reduced.  ====
-=== Wie kann ich BBB auf Englisch umstellen? ===
+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.
-BBB läuft komplett auf Englisch, wenn der eigene Browser in der englischen Sprachversion installiert wurde bzw. die "bevorzugte Sprache" in den Einstellungen "Englisch" ist.
+==== 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? ====
-=== Ich habe einen Fehler, der bis hierer nicht aufgeführt ist ===
+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 increases, the 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).
-Bei Fehlern gleich welcher Art gilt: Bitte prüfen Sie, ob ein Logout aus dem BBB-Server sowie ggf. ein Neustart Ihres Computers Abhilfe bei Ton- oder Übertragungs-Problemen schafft. Speziell bei schnell aufeinander folgender Nutzung mehrerer Konferenzräume oder zwischenzeitlicher Änderung der Mikrofon-/Lautsprecher-Kombination kommt es gelegentlich zu unerwarteten Situationen. Selbige ließen sich am einfachsten mit einem Neustart beheben, wobei alle später zu nutzenden Audio-Geräte bereits angeschlossen sein sollten.
+==== Is it possible to get an exclusive server for a BBB event? ====
+When we started using BBB in 2020, it 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 environment. Since 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 a 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”.
+==== It is difficult and confusing to react to feedback during a lecture. ====
+During a lecture, it is recommended to have an assistant who can observe chat messages and take care of participants.
+==== How do I use BBB in my courses? Or how do I invite the students to my BBB room? ====
+BBB is integrated into Stud.IP and Moodle via plugins. Please use either LMS to create and configure a BBB room for your course. See [[multimedia:webkonferenzen_mit_bigbluebutton:studip|]] and [[multimedia:webkonferenzen_mit_bigbluebutton:moodle|]] for further instructions.
+==== How can I use BBB in lecture halls and seminar rooms? ====
+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. \\
+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. Again, audio transmissions from the audience are only possible to a limited extent and questions may have to be repeated by the speaker. \\
+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.
+==== How can I transfer images from a visualizer? ====
+If a PC has multiple video sources, such as a webcam and a visualizer, then it is possible for BBB to transmit two video images at the same time. From BBB version 2.7, the function "Camera as content" can be used to display the visualizer image instead of the presentation with a resolution of 1920×1080 at 30 frames/s. Unfortunately, this means that data will be compressed which leads to a loss of quality. Therefore, the display of detail is limited.
+==== In breakout rooms, students should use more than one slide to jointly create a presentation. ====
+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.
+From BBB version 2.6, it 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|]]
+==== In a meeting with external partners, some cannot join the BBB room. ====
+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 else, you can contact the RZ support team for an alternative.
+==== How can I switch BBB to English? ====
+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.
+==== The answer to my question is not listed above. ====
+If your web browser or connected device malfunctions, then restarting your browser or PC often helps. If you use a browser other than Google Chrome, you can check if using Google Chrome solves the problem. If 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/]].
+{{tag>[mitarbeitende] [studierende] [doku_en]}}