Audio at Scale: Preparing Contribution for the Next Generation of Live Experiences
For years, contribution infrastructures have evolved primarily around one objective: delivering video with the highest possible quality, reliability, and efficiency. Improvements in compression, latency reduction, and network resilience have driven most technological innovation across the broadcast chain.
But as live services evolve, another factor is increasingly shaping how audiences perceive content: the experience itself. And within that experience, audio is becoming a decisive element.
Languages, stadium atmospheres, accessibility tracks, alternative commentaries and immersive sound environments are no longer secondary features. They are becoming essential components of modern live services, influencing how audiences engage with content and ultimately how platforms retain subscribers.
The shift toward personalized viewing experiences is transforming the role of audio in live production. What was once a single accompanying stream is now evolving into a complex ecosystem of audio elements designed to serve different audiences simultaneously.
At the same time, contribution infrastructures designed around fixed hardware capacities struggle to adapt to these new requirements. Increasing the number of audio components should not require replacing platforms or sacrificing video performance. This is why the industry is increasingly moving toward architectures designed for scalability by design.
From a Single Audio Track to Dozens of Experiences
Live content today reaches audiences that are far more diverse than in the past. A single event may need to address multiple geographic markets, each with its own language and cultural expectations. At the same time, viewers increasingly expect immersive sound environments that bring them closer to the venue itself.
Accessibility is also becoming an essential part of modern media services, introducing additional audio components such as descriptive tracks or dialogue enhancement. Streaming platforms are experimenting with alternative commentary formats, while rights holders explore ways to offer differentiated audio feeds tailored to specific audiences.
All of these developments naturally translate into a growing number of audio tracks associated with a single program. Where a contribution workflow once handled only a few channels, it must now support dozens of audio components while maintaining operational simplicity and preserving the integrity of the video workflow.
Scaling audio must therefore become a natural capability of contribution infrastructures rather than a disruptive change.
Contribution as the Foundation of Immersive Distribution
Contribution has traditionally been viewed as a transport mechanism, an efficient way to deliver a high-quality program feed from production to distribution. In a world of immersive and personalized media services, however, its role becomes far more strategic.
Immersive distribution formats and personalized audio experiences rely on the availability of underlying audio components. If these elements are not captured, preserved and transported during contribution, they cannot be recreated later in the distribution chain.
Contribution therefore, becomes the foundation of immersive distribution, determining whether downstream systems can construct richer experiences from the original media elements.
Looking ahead, emerging technologies across the ecosystem (from scalable IP transport environments to memory-based media exchange frameworks and new immersive audio interchange standards) are all converging toward the same objective: enabling contribution infrastructures capable of supporting richer audio structures, larger channel counts and dynamic metadata workflows.
Scalable Contribution for Immersive Experiences
Why Traditional Architectures Struggle to Scale
Traditional broadcast architectures were designed around predictable and relatively limited audio requirements. They remain extremely reliable but were not built with large-scale audio flexibility in mind.
As the number of audio components increases, rigid workflows can quickly become complex. Expanding capacity may involve adding hardware resources, restructuring signal paths or introducing new operational layers.
The challenge is not related to audio quality itself, which has long met broadcast standards. The challenge lies in scalability. Increasing the richness of audio should not come at the expense of encoding density, video quality or infrastructure simplicity.
Modern contribution systems must therefore evolve toward architectures that allow audio capacity to grow without forcing fundamental infrastructure changes.
IP Architectures Unlock Audio Flexibility
The transition toward IP-based infrastructures, particularly environments built around SMPTE ST 2110, introduces a structural change in how media components are transported.
By separating audio and video into independent flows, IP systems remove the rigid constraints associated with embedded transport models. Audio becomes an independent resource that can expand according to production needs without affecting video processing.
This architectural approach makes configurations involving 32 or even 64 audio tracks operationally feasible in large-scale environments. These figures do not represent limits imposed by standards; they simply reflect the growing maturity of IP ecosystems capable of handling increasingly complex audio workflows.
With such architectures, adding new languages, ambiences or accessibility feeds becomes a natural extension of the workflow rather than a structural redesign.
Scalable Audio Contribution Workflow
The Importance of Software-Driven Scalability
Supporting a large number of audio channels today is only part of the challenge. Equally important is ensuring that systems can evolve tomorrow without requiring hardware replacement.
Software-driven contribution architectures provide this flexibility. When media processing, routing and service configuration are defined in software rather than fixed hardware structures, infrastructures gain the ability to adapt as workflows evolve.
Increasing the number of audio tracks should not reduce video encoding capacity, compromise video quality or require additional hardware platforms. Instead, systems should be able to expand logically, allowing operators to introduce new audio groups, languages or services while maintaining the same video performance.
True scalability therefore comes from software evolution rather than hardware expansion.
Preparing for Future Audio Ecosystems
While IP transport already enables significant flexibility, the broader media ecosystem continues to evolve in ways that will further expand the role of audio.
Architectures such as Media eXchange Layer (MXL) aim to simplify internal media processing by enabling efficient memory-based exchanges between processing components. By reducing dependency on rigid interface chains, these approaches help remove internal bottlenecks and make it easier to handle increasingly complex media structures.
At the same time, contribution technologies continue to evolve across different latency and efficiency trade-offs. Codecs such as JPEG-XS enable visually lossless transport with extremely low latency, while intra-frame approaches such as AVC-I or HEVC-I offer a middle ground between latency and compression efficiency. Short-GOP AVC and HEVC contribution codecs remain widely used where higher compression efficiency is required while maintaining contribution-grade latencies in the range of a few hundred milliseconds.
The audio ecosystem itself is also evolving toward richer interchange frameworks. Emerging specifications such as Immersive Interchange Format Pro (IIF-Pro) are designed to support complex channel structures together with dynamic audio metadata. In these workflows, immersive audio elements and their associated metadata can travel together throughout production, contribution and distribution.
Such approaches allow large channel counts and dynamic rendering instructions to coexist within a single transport structure, enabling more flexible immersive audio ecosystems across the media chain.
Audio as the First Step Toward Personalized Live Experiences
In a media landscape where audiences expect increasingly personalized experiences, contribution infrastructures must be designed to evolve.
Transport technologies such as IP networks and OTT contribution models provide the scalability needed to deliver content across global audiences. But the immersive experience itself is built on personalization, and audio plays a central role in enabling that personalization.
By supporting multiple languages, premium audio groups and audience-specific feeds, contribution infrastructures move closer to the end user and enable the diverse listening experiences that modern viewers expect.
From stadium microphones capturing the atmosphere of a live event, to scalable contribution platforms processing dozens of audio components, every stage of the workflow must now be designed with audio scalability in mind.
In that sense, the future of scalable contribution does not begin with video.
It begins with audio.
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About the Author
Solution Marketing Senior Director at Ateme
Julien joined Ateme in 2001, starting in the Hardware Department before moving into Product Management, where he led the launch and evolution of the Kyrion product line.
In 2017, he co-founded the BISS-CA standard with the EBU, reshaping the secure distribution of international live events.
He is currently Solution Marketing Director for Contribution and Distribution, driving partner and customer engagement around the Kyrion and TITAN product lines.