“现场” tvOS 15 UI 上的徽章
我了解到 tvOS 15 的播放在标题视图上有一个新的红色“LIVE”徽章。视频流式传输时会出现 LIVE 徽章。
但是，它如何知道视频正在直播并设法显示徽章？定义直播的信息是否包含在元数据中？
I learnt that tvOS 15's playback has a new red "LIVE" badge upon title view. The LIVE badge appears when the video is streaming.
However, how does it know the video is live streaming and manage to display the badge? Is the information which defines Live streaming included in metadata?
I watched WWDC 21 and read an official document but couldn't find the answer.
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我通过与合作工程师讨论并阅读 HLS 文档解决了这个问题： https://datatracker.ietf.org/doc/html/rfc8216#section-4.3.2.6
似乎有一个m3u8标签
EXT-X-PLAYLIST，定义内容是否为LIVE。如果此标签具有特定事件值但没有值，则它被定义为“实时”。
I figured out this question by discussing with co-working engineers and reading the HLS document: https://datatracker.ietf.org/doc/html/rfc8216#section-4.3.2.6
It seems that there's a m3u8 tag
EXT-X-PLAYLIST, which defines whether the content is LIVE.If this tag has a specific event value doesn't have a value, it's defined LIVE.