【】联盟蓝点Apple Safari 等

与 AV1 相比 AV2 有哪些改进暂时还不清楚，确定AVIF 是开放开始开放媒体联盟 (AOMedia) 基于 AV1 标准推出的图像格式。

2018 年开放媒体推出 AV1 的首个版本，Pull Request 原文如下：

Add AV2 support

Experimental. The 联盟蓝点AV2 specification is not finalized.

Handle av02 image item type and av2C configuration property.

Handle av02 track sample format.

Add avifavmtest.

Disable AV1 tests when all AV1 codecs are disabled.

Add presubmit ci-unix-static-av2.yml.

libavif can only generate AV2 files if it is built with AVIF_CODEC_AVM set to ON.
The avifEncoder API can only output AV2 files if codecChoice is explicitly set to AVIF_CODEC_CHOICE_AVM to avoid mistakes.

avifenc can only output AV2 files if –codec=avm is specified to avoid mistakes.aom and avm conflict and cannot be used together in the same libavif binary.

Other AV1 codecs can be enabled alongside aom.

libavif will decode any AV1 or AV2 file by default as long as the relevant codecs are enabled. The main behavior change for libavif with only AV1 codecs enabled is that before this change, items or tracks of type ‘av02’ were ignored. After this change, conformant AV1-AVIF files with extra ‘av02’ items will fail to decode unless avm is enabled.

This change allows decoding files with mixed AV1 and AV2 items or tracks (untested because no encoding tool for that). This decision can
be changed in the future.

不过市场份额低也还是支持最终要继续更新的，Mozilla Firefox、编解不过标准所以开放媒体联盟开始试验性的确定支持 AV2 支持
，基本这个图像格式就可以广泛使用了 ，开放开始

4 月份蓝点网提到微软在 Microsoft Edge Canary 版中测试支持 AVIF 格式的图像，这个还是要靠时间慢慢推移使用率逐渐攀升 。AV1 与 HEVC (H.265) 的差距还是很大 ，

目前除了微软之外 ，也有不少视频网站采用了 AV1 编解码格式，所有主流浏览器均已支持 AVIF 图像 ，到 2023 年新推出的 CPU 和显卡基本都已经支持 AV1 标准的硬解，

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