Reaching 100,000+ live viewers might sound like something reserved for major broadcasters. However, with the right planning, technical infrastructure and experienced crew, large-scale live streams are more achievable than many organisations realise. Instead of relying on a single destination, this project required a fully synchronised broadcast across YouTube, Facebook Live and a private corporate platform. As a result, every component had to be designed for stability, redundancy and professional-grade quality.

At Bubble Production, we recently delivered a multi-camera broadcast that hit more than 100,000 concurrent viewers with zero buffering or downtime. Thanks to careful engineering and a robust workflow, the stream remained flawless throughout audience spikes and platform switching. This behind-the-scenes breakdown reveals exactly how we built the system — and what it takes to scale a stream to this level.

The Challenge: Delivering a Live Event to a Huge Online Audience

The client needed a real-time broadcast capable of reaching viewers on multiple platforms simultaneously. Additionally, the event required:

• High-definition multi-camera coverage

• Smooth branded graphics, lower thirds and sponsor content

• Complete redundancy across all mission-critical systems

• Zero visible interruptions for the audience

With tens of thousands expected to tune in, reliability became the top priority. Consequently, we approached the project as a full outside broadcast operation rather than a standard livestream.

The Setup: Multi-Camera, Multi-Platform and Fully Redundant

To meet the requirements, we designed a broadcast-grade, scalable workflow equipped to handle both high viewership and multi-platform distribution.

🔹 Cameras & Crew

A six-camera 4K setup covered the stage, audience, reaction shots and backstage areas. Meanwhile, a dedicated team — including a Director, Vision Mixer, Sound Engineer and multiple Camera Operators — ensured smooth coordination and continuous coverage.

🔹 Vision Mixing & Graphics

Live switching was handled through a Blackmagic ATEM 8K Constellation, allowing rapid transitions between camera angles. Furthermore, we integrated:

• Lower thirds

• Branded overlays

This provided a polished, television-style viewing experience.

🔹 Encoding & Transmission

To improve resilience, we implemented parallel encoding paths:

• Primary: LiveU hardware encoders

• Backup: Blackmagic encoders

Additionally, we delivered using bonded 4G/5G uplinks, ensuring the stream never relied on a single service. As a result, we could transmit SRT feeds to YouTube, Facebook Live and Vimeo Enterprise concurrently.

🔹 Audio & Comms

A full PA mix fed directly into the stream, while an internal comms network allowed the director, operators and control truck to respond instantly to changes on the ground.

The Infrastructure: Purpose-Built for Scale

Delivering a stream to 100,000+ concurrent viewers requires significant infrastructure. Therefore, we used adaptive bitrate encoding so that viewers with slower connections could still watch smoothly. Additionally, CDN distribution through Vimeo  provided the global capacity needed to support heavy traffic without performance dips.

To increase reliability even further:

• Redundant feeds were sent to separate ingest servers

• Real-time analytics monitored latency, playback behaviour and live viewer numbers

Consequently, the entire broadcast ran without buffering, frame drops or audio loss.

Production Day: A Broadcast Operation in Motion

Our team arrived a day early to complete setup and deploy cabling on the street. Once the event went live, the production ran like a coordinated TV broadcast.

During the stream:

• The Director called shots and managed pacing

• The Vision Mixer handled transitions and source selection

• The Technical Director monitored stream health, backups and CDN performance

• The Marketing Team received live viewer statistics and engagement updates

Throughout the event, audience numbers climbed steadily and peaked at more than 100,000 concurrent viewers, eventually surpassing 250,000 total views within 48 hours.

Post-Event Results & Highlights

Once the event concluded, we supplied:

• A high-quality master recording

• Short highlight edits for social media

• A comprehensive analytics report detailing viewer behaviour, watch time and geographic distribution

Feedback from the client was overwhelmingly positive:

“The quality was exceptional — smooth, professional, and exactly what we hoped for. We can’t believe how effortless it looked to the viewer.”

What We Learned: Key Takeaways for Large-Scale Streaming

Even with months of preparation, high-audience live streams always require agility. Several lessons stood out during this broadcast:

✔ Over-provision your internet capacity

It’s always safer to double (or triple) your estimated requirement.

✔ Redundancy is essential

Backup encoders, power supplies, audio paths and network links can prevent issues long before they reach the viewer.

✔ Test all platforms in advance

Simultaneous test streams highlight issues that isolated tests may miss.

✔ Skilled technicians make all the difference

A knowledgeable team can predict, prevent and resolve technical challenges instantly — ensuring complete reliability.

Ready to Scale Your Next Live Stream?

Whether you’re planning a conference, product launch, music festival or national broadcast, scaling a stream to large audiences doesn’t have to be intimidating. With broadcast-grade systems and a proven production workflow, Bubble Production can deliver multi-camera live streaming across the UK with the same reliability used for six-figure audience events.

🎥 Want to reach tens of thousands of viewers — reliably?

Contact our team to discuss your next large-scale live stream.