WebRTC Video Conferencing

The Role of Scalable Video Coding (SVC) in Video Calls

9 min read

February 29, 2024

Have you ever experienced the frustration of watching a choppy video due to slow internet? Say hello to Scalable Video Coding (SVC), your ultimate saviour! Picture this: one video stream seamlessly adapts to fit any screen size, bandwidth capacity, or even viewer preference.

SVC works by encoding video in layers, similar to peeling an onion. Each layer adds specific details, such as higher resolution or smoother motion, and can be peeled away for devices with lower power or unreliable connections. This ensures that everyone gets to enjoy the best version of the video that their technology can handle—no more buffering nightmares!

In this article, we'll delve into this incredible technology, exploring its benefits and drawbacks. Let's jump right in!

Table of Contents

What is SVC?
How SVC works
The benefits of SVC
Limitations of SVC
Optimising video conferencing: Digital Samba SDK/API's approach with VP8 and simulcast
Conclusion

What is SVC?

SVC, which stands for Scalable Video Coding, is built on the H.264/MPEG-4 compression standard, enabling the encoding of high-quality video that has lower-resolution sub-videos embedded inside. A single SVC video bitstream can have multiple layers of video quality, so devices with different capabilities can play appropriate layers based on their resources.

A major benefit is scalability in multiple dimensions: frame rate, resolution, and fidelity. A basic device may decode only some frames from the SVC stream at a lower resolution. On the contrary, a high-end device can fully decode the maximum resolution of the same stream. Playback adapts across devices this way without needing video format conversion.

As more platforms play the video, SVC enables efficient delivery over networks. A single encoded video can now serve differing device abilities. The backward compatibility of H.264 also makes SVC suitable for internet video, broadcasting, conferencing, and other apps that reach many device types.

The scalable nature and reuse of H.264 give SVC advantages. It is well-suited for heterogeneous playback scenarios. Pretty cool, right? Now you know the basic idea behind SVC! Let's explore how it actually works.

How SVC works

SVC might sound like a fancy tech term, but its inner workings are surprisingly straightforward. This is how SVC works to bring a smooth and suitable video stream to your screen:

Multiple layers

Think of a video like an onion. SVC creates different layers, each containing a portion of the video data. Like the outermost onion skin, the first layer holds the bare video essentials—enough to get the gist of the scene even on a dodgy internet connection. Each subsequent layer adds more detail, like sharper visuals, higher resolutions, etc.

Smart device, smart choice

Your device, be it a phone, laptop, or smart TV, acts as the discerning audience. It assesses its capabilities, like available bandwidth and processing power, and chooses the perfect layer from the SVC stream. This ensures smooth playback without buffering or pixelated nightmares.

Adaptability is key

The beauty of SVC is its flexibility. Need a quick video preview on your phone? Grab the low-resolution layer. Watching a movie on a big screen with lightning-fast Wi-Fi? Dive into the high-definition goodness with all the bells and whistles. SVC adapts to your situation, delivering the optimal viewing experience every time.

So, SVC isn't just about saving bandwidth; it's about tailoring the video experience to your specific needs. It's like having a personal video chef whip up the perfect dish for every device and viewing scenario.

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The benefits of SVC

SVC is a game-changer for video viewers like you and me. Think of it as a magic trick that makes videos bend and twist to fit your device, the internet, and even your mood. Here are some ways SVC makes your viewing experience smoother than a freshly paved road:

Bandwidth-friendly delivery

Say goodbye to data-hungry videos! SVC's layered approach enables efficient streaming even on limited bandwidth. The decoder can access only the necessary layers, reducing overall data consumption by up to 50% compared to traditional video encoding. This translates to faster loading times, lower costs for service providers, and a happier viewing experience for users on mobile networks or in areas with limited internet access.

Smooth streaming on all screens

Imagine a video that adjusts its resolution and quality on the fly, ensuring smooth playback on smartphones, tablets, and laptops. SVC makes this a reality by encoding video in layers, from low-resolution essentials to high-definition details. The decoder then selects the layers best suited for the device and network conditions, eliminating buffering and choppy playback.

Accessibility for all

SVC's scalability extends beyond resolution and bandwidth. It can also be used to create lower-complexity versions of the video, making it accessible to viewers with visual impairments or slower processing devices. This inclusivity ensures everyone can enjoy the same high-quality content, regardless of any technical limitations.

Future-proofing your content:

With technology evolving at breakneck speed, who knows what the next big screen will be? SVC ensures your video stays relevant by being device-agnostic. The encoded layers can be adapted to future devices and resolutions without re-encoding the whole video, saving time and resources.

Enhanced video conferencing

Video conferencing just got a whole lot smoother. SVC can dynamically adjust the video quality based on individual participants' bandwidth and device capabilities, ensuring clear communication even in challenging network conditions. This promotes more productive and engaging video meetings for everyone involved.

Streamlining live broadcasts

Live streaming is a powerful tool, but it can be plagued by buffering and latency. SVC comes to the rescue by providing real-time adaptation to varying network conditions. Viewers can enjoy uninterrupted live streams even on unpredictable connections, making SVC ideal for live events, sports broadcasts, and online gaming.

Flexibility for content creators

SVC empowers creators with greater control over their content. They can choose which layers to include and tailor the video experience for specific audiences or platforms. This flexibility opens up new creative possibilities and allows creators to cater to diverse viewing preferences.

Efficient content storage and archiving

Storing multiple versions of a video for different devices can be a storage nightmare. SVC eliminates this need by storing just the base layer and allowing the decoder to generate the required versions on demand. This saves valuable storage space and simplifies content archiving.

Scalable Video Coding isn't just a technical feat; it's a video delivery revolution. With its ability to seamlessly adjust to any screen size, bandwidth capacity, and viewer preference, SVC guarantees an enjoyable viewing experience for all. So, whether you're creating or watching a video, take a moment to appreciate the invisible magic of SVC quietly working behind the scenes, making the video world more inclusive and adaptable than ever before.

Limitations of SVC

SVC offers a compelling solution for adapting video streams to diverse network conditions and device capabilities. However, it's not without its limitations. Here are some key drawbacks to consider:

High processing power

Think of SVC as a video puzzle with a million pieces. Encoding and decoding these layered videos requires extra processing power, making older devices and slower internet connections break a sweat. Imagine playing a complex board game blindfolded—it's not exactly a smooth experience!

Can drain battery

Decoding all those video layers on the fly is like your phone running a marathon. This can be a real drain on battery life, especially for mobile devices. So, keep your charger handy while streaming SVC content—think of it as giving your phone a post-workout energy boost!

Bandwidth balancing act

While SVC can be a data-saving superhero, it's not always a linear equation. Complex scenes with lots of detail can actually require more data to encode in layers. Think of trying to compress a fluffy cloud into a tiny box—sometimes, it just takes more air!

Compatibility issues

Not every device supports SVC. Older video players and less popular devices might struggle to cope with the layered format. It's like trying to have a conversation with someone who only speaks in song lyrics—sometimes, the meaning gets lost in the melody!

Despite its limitations, SVC continues to be a valuable tool for delivering videos in various situations. Its ability to scale and adapt often outweighs the drawbacks, especially for applications like video conferencing, on-demand video with adaptive bitrates, and content delivery networks catering to users with different bandwidths.

Optimising video conferencing: Digital Samba SDK/API's approach with VP8 and simulcast

Digital Samba's SDK/API brings innovation to video conferencing by leveraging the VP8 codec alongside simulcast technology. While SVC might see wider acceptance down the road, this method offers efficiency, adaptability, and an exceptional user experience right now. Let's dig deeper into the benefits for users and developers.

Simplifying stream management with VP8 and simulcast

At its core, the VP8 codec, coupled with simulcast technology, streamlines the delivery of video content. Unlike SVC, which encodes a video into a single stream with multiple layers of quality, VP8 employs simulcast to transmit multiple streams simultaneously at varying qualities. This innovative approach empowers recipients to select the stream that aligns best with their current internet speed and device capabilities, ensuring an optimal viewing experience without the need for complex decoding processes.

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Why choose VP8 with Simulcast over SVC?

Digital Samba prioritises VP8 with simulcast to deliver a seamless and adaptable video conferencing experience. Here's why this approach offers advantages in the current WebRTC landscape:

Browser compatibility

Current WebRTC browser support for SVC is primarily limited to VP9 and not universally reliable. VP8 with simulcast enjoys broader and more dependable cross-browser support, ensuring your video conferencing works effectively for more users.

Scalability for all devices

Simulcast delivers independent video streams at varying resolutions, allowing devices to select the ideal stream for their capabilities. This ensures smooth playback without performance issues, especially on less powerful devices.

Seamless network adaptation

Simulcast can offer a potentially smoother transition during sudden, significant bandwidth reductions compared to SVC's layered approach in certain scenarios.

Reduced latency for real-time interaction

The simpler structure of simulcast avoids potential processing delays, leading to lower overall latency and facilitating more natural and responsive conversations.

While SVC holds potential for the future of WebRTC, VP8 with simulcast presently delivers a more consistent and robust video conferencing experience across the wide variety of browsers and devices in use today.

Conclusion

Scalable video coding brings major benefits like smooth streaming, efficient delivery, and flexibility. However, complex processing can drain batteries and challenge compatibility. Ultimately, SVC enhances accessibility, adaptability, and inclusivity in video experiences.

Though limitations exist, SVC empowers creators and enriches users across devices. VP8 with Simulcast prioritises scalability and low latency for natural conversations in video conferencing. By blending efficiency with experience, these innovations propel video technology into an adaptable future for all.

Digital Samba's SDK/API uses VP8 codec to make video calls better. It chooses the best video quality based on your internet connection and device. This means clearer calls without interruptions. Take advantage of our 10,000 free monthly credits to build a truly scalable video call functionality into your apps and websites. Sign up to get started!

FAQ

Scalable Video Coding (SVC) is a video compression technology that enables the efficient delivery of video by creating multiple layers within a single stream. These layers allow for adaptable quality and resolution adjustments, making SVC ideal for real-time applications like video conferencing scalability and live streaming, where network conditions may fluctuate.

SVC supports WebRTC scalability by enabling adaptive streaming that adjusts video quality based on network conditions. This adaptability ensures smooth video transmission across different devices and bandwidths, making SVC essential for applications that require efficient real-time video conferencing with adaptive frame delivery.

SVC enables adaptive frame delivery by encoding video in multiple layers, allowing the system to adjust the quality dynamically based on network conditions. This approach provides efficient real-time video conferencing that minimises lag and maintains quality, even under varying network loads.

Unlike traditional video coding, SVC encodes video in layers, making it possible to adapt video quality to different network conditions without requiring a separate stream for each resolution. This flexibility allows for more efficient bandwidth usage and smoother experiences on variable networks.

Scalable video transcoding refers to the process of re-encoding scalable video content to meet various quality and resolution requirements. It enables content to be tailored to the capabilities of the device or network used, improving performance for viewers across diverse platforms.

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