devroom manual: add video-related information

content/manuals/program/devroom.md

@@ -194,4 +194,92 @@ updating the site until this is corrected in the database.
 
 * to be updated for pretalx
 
+## During the event
+
+### Where to get help
+
+* For general questions on Matrix, `#devroom-managers:fosdem.org`
+* For video/audio questions, `#video:fosdem.org`. The video team
+  monitors also the devroom managers channel, but this might be faster.
+* When using matrix, always mention your room name. Best way is
+  to change your nick name in the room by typing
+  `/myroomnick [k3401] your_nick_name`
+* In person: there is a per-building team in every building, together
+  with FIT or NOC (AW.1125, H.2111, UB4.228, UD2.119)
+* For core issues, the NOC/VOC is in K at the end of corridor in
+  front of K.1.105. Please come to that room only for emergencies.
+
+The best way would be to ask in the matrix chat, someone will respond shortly
+and see if people need to be dispatched your way.
+
+### Remote questions
+
+There is a chatroom in Matrix for your devroom, in which people can see the
+live stream of the talk and add questions. The room is named after the devroom
+(not the physical room).
+
+If you have your Matrix ID in pretalx, you'll be pulled directly. If you have
+any issues with this, ask questions in the devroom managers' Matrix room.
+
+### Starting a presentation
+
+* Connect the speaker's laptop to the HDMI in port of the video box. If the
+  speaker doesn't have HDMI, adapters are available either in the room or
+  with the per-building video support team.
+  * Make sure that the video box displays the screen of the laptop on its
+    display. The output there is delayed by ~5 seconds.
+* Make the speaker wear the microphone. Here are some guidelines:
+  * The microphone is attached to speaker's clothes, close to the neck,
+     under the chin in the middle of the torso;
+  * Ensure no necklaces, lanyards, scarves, beards or other objects that
+    could touch the microphone during the talk;
+  * If there is no suitable place to attach the microphone, a lanyard
+    could be used for this purpose;
+  * The microphone receiver is attached to the belt of the speaker.
+    If this is not possible, attach it to their pocket;
+* **Make sure the microphone is turned on** and **not muted**. The audio
+  levels can be checked on the camera and on the video box where the
+  microphone is connected.
+
+### Video mixing control
+
+At `https://control.video.fosdem.org/` you can access the video control for
+your room. Username and password will be provided via pretalx.
+
+The interface is pretty self-explanatory (and usable even on a mobile phone).
+You can see the current output, the camera and presenter box sources, and
+select one of four different views that will go on the stream and be recorded:
+
+* Picture-in-picture - big presentation, small camera view (this is the default), or swapped
+* Full-screen - camera or presentation
+
+If you don't want to deal with this, leave it at the default. This should be
+fine for most of the presentations.
+
+If you want to make the most of it, these are a few guidelines:
+
+* Use "full-screen - camera" for the intro and Q&A
+* Use "Picture-in-picture - big camera view, small presentation" for most of the presentation
+* Use "full-screen - presentation" for demonstrations or slides with a lot of small text
+
+Be aware that whatever you choose to do will also end up in the final
+recordings. What is streamed is recorded. We will not re-mix videos after the
+conference.
+
+### Review
+
+`https://review.video.fosdem.org` is for preparing the finished videos.
+
+* All speakers will receive a link for reviewing their video.
+	* As a devroom manager, you'll be on CC: for such emails.
+* The video team in your building may be able to help you with this, depending on their workload.
+* Contact: Wouter Verhelst <[email protected]>.
+
+### Misc
+
+Because most rooms cannot have a dedicated volunteer to manage the camera and
+follow the speaker around, we recommend taping two stripes of duct tape or
+similar on the floor to mark the end of the camera's field of vision and
+notifying the speakers to keep in that area. The video team will prepare those
+for the rooms where those could be needed.