Multicam Workflows

Multicam workflows. coordinating multiple camera feeds through Vision Mixing, switching, graphics, recording, and simultaneous delivery in real time. are the backbone of professional live production. They're also one of the most complex elements to execute reliably at scale.

A multicam event requires that every camera has synchronization (genlock for SDI cameras, or timecode for IP-based feeds so frame alignment is exact). If camera 1 and camera 2 aren't genlocked, switching between them creates an imperceptible but jarring micro-stutter as frame timing realigns. For distributed productions like EWC with five separate arenas, maintaining genlock across venues requires careful planning. usually a central genlock signal distributed via fiber or GPS-derived timing.

The vision mixer (technically, a video switcher like BlackMagic ATEM or vMix) ingests all camera feeds, selects one as primary at any moment, and outputs the selected feed to encoding and delivery systems. This might sound simple, but the mixer is also typically handling graphics layers, color correction, slow-motion replays, and downstream keying. A single mixer failure takes down the entire broadcast.

For EWC, we ran redundant vision mixers in each arena. the primary ATEM handled all mixing, a backup ATEM stood ready, and an automatic failover system would switch to backup if the primary failed. During the three-month tournament, we had one primary mixer fail mid-event, but viewers never saw disruption because the failover was transparent.

Recording multicam streams adds another layer. You're simultaneously recording every camera feed (archival quality), recording the mix output (delivery quality), and sometimes recording separate audio stems so post-production can remix audio later. This means simultaneously writing 10-15 gigabytes per minute to storage during a live event. Storage, networking, and backup strategies become critical operational issues.

Multicam coordination also requires a communication system between the vision mixer, camera operators, and production control. The mixer needs to know if a camera is about to move so they can time the cut appropriately. Cameras need feedback about what's on air so they know if they're "hot" (currently broadcasting) or "standby" (not currently visible). This is managed through tally lights (physical lights on camera heads) and Comms Systems where the mixer coordinates with operators.