Meta Adopts AV1 Codec for Enhanced Real-Time Communication

Introduction of AV1 at Meta

Meta has been working for several years on adopting the AV1 codec for real-time communication (RTC). This effort includes challenges related to codec selection, device compatibility, and ensuring quality under varying network conditions. In 2023, AV1 was introduced for real-time video calls on high-end devices, and Meta has since expanded its implementation.

Advantages of AV1

AV1 provides significant benefits over the older H.264/AVC codec. It delivers comparable visual quality using significantly less bandwidth. Initial tests showed a minimum of 20% bitrate reduction in Meta's applications when using AV1, making it beneficial for users in areas with constrained network resources. Unlike H.264/AVC, AV1 maintains clarity even at lower bitrates, which is crucial for maintaining good user experiences in real-world conditions.

Implementation Challenges

Deploying AV1 at scale involved tackling numerous technical and operational issues. Meta focused on optimizing rate control and error resilience to manage the challenges posed by real-time communication over varied network conditions. Maintaining video quality in environments with fluctuating bitrates is particularly challenging, but the AV1 codec has shown promising results.

User Experience Evaluation

User experience with AV1 was evaluated through side-by-side comparisons in the Messenger app using two Android phones. At a limitation of 100 kbps, the AV1 video consistently demonstrated clearer images compared to H.264/AVC, signifying its effectiveness in low-bandwidth situations. This comparison highlights AV1's advantages for users who might be on slower connections.

Conclusion and Future Directions

Meta's shift to the AV1 codec aims to enhance video quality for real-time communication, especially in regions with limited internet accessibility. As AV1 becomes more widely supported across devices, Meta will continue to improve the quality and reliability of its RTC applications. The focus will also extend to optimizing support for high-quality computer-generated content, which is increasingly relevant for various communication needs.