字节火山引擎、阿里云、腾讯云联合发布“超低延时”直播技术标准

2 月 25 日消息，在火山引擎今日举办的视频云科技原力峰会上，火山引擎与阿里云、腾讯云联合发布一项“超低延时直播协议信令标准”。

该标准首次正式定义了直播“客户端-服务器”信令交互流程，将传统直播技术 3 至 6 秒的延时缩短到 1 秒，可广泛应用于赛事直播、在线教育、电商直播等对实时性要求较高的场景，为用户带来超低延时、低卡顿、秒开流畅的直播体验。

官方介绍称，受到传输协议等因素限制，传统直播技术存在明显延迟。比如，用手机看比赛直播，经常会忽然听到一阵欢呼，附近的电视观众已经看到进球，自己过会儿才能在手机上看到。即使网速再快，网络直播总是慢半拍。

为了降低直播延迟，视频行业近年来开始使用 WebRTC（网页即时通信）技术。但由于 WebRTC 没有定义信令交互流程，不同使用者都有各自一套客户端与服务器的交互逻辑，效果参差不齐，行业缺乏标准化的解决方案。

基于技术实践，火山引擎、阿里云、腾讯云合作共建了“超低延时直播协议信令标准”，简化信令交互流程，并对 WebRTC 技术做了大量优化，提升扩展性、播放秒开率和成功率，包括支持更多的音视频封装、通信协议，支持快速建立链接降低首帧渲染时间，以及支持信令安全增强等特性。

IT之家了解到，数据显示，新的技术标准使大规模分发的直播延时进入 1 秒大关，最快可达到 500 毫秒。

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