Shulou(Shulou.com)11/24 Report--

Thanks to CTOnews.com netizen 0x13217D4 for the clue delivery! CTOnews.com, November 21, AV1 is the first generation of open, royalty-free video coding standard developed by the Open Media Alliance (AOM,Alliance for Open Media). Under the same picture quality, the bit rate is about 20% lower than H.265 / HEVC. After the continuous promotion of Google, Netflix, Meta, Amazon and other Internet giants, the current AV1 ecology has gradually developed and matured.

Bilibili officially said that bilibili began to develop his own BILIAV1 encoder at the end of 2020. at the beginning of 2022, he began to deploy AV1 coding in the PC side VOD service, and is currently actively preparing for the application of AV1 coding in the live broadcast business.

According to reports, the BILIAV1 project began in October 2020. At that time, the open source software encoders mainly have reference codes Libaom and Intel SVT-AV1. Based on the existing open source product secondary development can save a lot of time in the research and development of basic components, is the encoder relatively safe research and development route, but bilibili coding team's research found that although Libaom and SVT-AV1 have obvious space for optimization, but its original architecture design has seriously restricted the use of many optimization technologies, therefore, based on the team's existing technology accumulation, the official decided to develop an AV1 encoder from scratch.

Performance comparison between BILIAV1 and SVT-AV1 in the same picture quality of ▲ BILIAV1 has been launched to transcode web side VOD. BILIAV1 2.4.0 saves about 15% of the average bit rate compared to the open source SVT-AV1 1.7.0 encoder.

Bilibili officially said that as iPhone begins to support AV1 hard solution, it can be predicted that the deployment of AV1 on mobile will gradually increase in the next few years, and bilibili will continue to increase investment in BILIAV1. CTOnews.com noted that bilibili listed points for further optimization of BILIAV1 in the future:

In the aspect of VOD: develop more efficient and fast algorithms in order to open some better performance tools in VOD stalls.

LVB: compared with VOD, the LVB deployment of AV1 is more challenging. With the gradual maturity of VOD stalls, BILIAV1 will gradually increase its application in LVB stalls.

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