Hybrid does not just mean “with a stream”
A hybrid congress has two audiences who should experience the same event: the people in the room and the people following from home or the office. Often there is a third group too, the remote speakers, who need to hear the room and be heard without delay or echo.
The result depends little on the platform and a lot on four things: the connection, the audio, the video direction and the rehearsals. This is the checklist we follow, stage by stage.
Two weeks before
These are the decisions that, if postponed, turn into problems on the day.
- Choose the platform (Zoom, Teams, YouTube or a congress platform) and decide who runs it.
- Ask the venue for a dedicated wired line, not the guest Wi-Fi.
- Check the upload speed: at least twice the stream bitrate, for example 12 Mbps for Full HD at 6 Mbps.
- Plan a backup connection, such as a 4G/5G router ready to take over.
- Collect the list of remote speakers, with their time zone and the device they will use.
- Decide whether the sessions are recorded, and in what format the files are needed.
Audio is the part that does not forgive
Online viewers forgive an imperfect shot, but not audio that comes and goes. That is why the stream needs its own mix, separate from the room: the room needs speakers, the stream needs a clean signal with a steady level from one speaker to the next.
Remote speakers get a dedicated mix, known as a “mix-minus”: they hear the whole room except their own voice. This is what prevents the annoying echo heard in so many video calls.
Questions from the floor must always be asked into a microphone, even in a small room. Without one, remote viewers do not hear the question and the speaker’s answer loses its meaning.
Video direction, slides and shots
A video control desk handles cameras, slides and remote links in one place. For a congress two or three cameras are usually enough: a wide shot of the stage, one on the speaker and, if needed, one on the audience for questions. PTZ cameras, controlled remotely, let one operator do all of it.
- Collect all the presentations the day before, on a single control-room computer.
- Put a confidence monitor in front of the stage, so speakers see their slide without turning round.
- Prepare lower thirds with each speaker’s name and role.
- Keep a holding slide (“back in a moment”) ready for breaks and the unexpected.
The day before: rehearsals
The most useful test is also the simplest: connect each remote speaker with the same computer, the same connection and the same room they will use the next day. In ten minutes you discover unsuitable laptop microphones, slow connections and windows behind people.
In the room, soundcheck with the people who will actually use the microphones, set the levels and run a private test stream from start to finish, listening on another device.
During and after
During the congress, one person in the control room watches the stream on an external device, as the audience sees it. A moderator reads the questions arriving in the chat and passes them to the speaker. At the end of each session the recording is saved and checked for completeness.
- Record locally as well as on the platform: if the connection drops, the recording survives.
- Note the real start time of each talk in the run of show, useful for editing.
- Deliver the files within a few days, clearly named by session and speaker.
