术语:“live-dvr"在 mpeg-dash 流媒体中 [英] Terminology: "live-dvr" in mpeg-dash streaming

问题描述

我正在处理实时 MPEG-DASH 流媒体，我想知道是否存在针对给定功能的标准术语.

I'm working with live MPEG-DASH streaming, and I would like to know if there exists a stardard terminology for a given functionality.

这是live-dvr"功能.也就是说，实时流和 VOD 功能之间的混合:带有播放器中的搜索栏的实时流允许观看过去的流时间.这涉及一系列基础架构调整.

It's the "live-dvr" functionality. That is, a mix between a live stream and VOD features: a live stream with the seeking bar in the player allowing to watch past stream time. This involves a series of infrastructure tweaks.

这个设置的术语live-dvr"有点不正式，不同方以自己的方式称呼它:live catch-up"、live-vod"、cached live"，一些供应商设置了根据他们的产品线命名，等等.我想知道这种设置是否有标准术语.特别是因为解释标准以了解清单的设置参数可能会在没有正确术语的情况下造成混淆甚至误导.

The term "live-dvr" for this setup is kind of informal, and different parties call it in its own way: "live catch-up", "live-vod", "cached live", some vendors set the name for this based on their product lines, and so on. I would like to know if there's a standard term for this kind of setup. Specially because interpreting the standard in order to understand setup parameters for the manifests may be confusing or even misleading without proper terminology.

推荐答案

MPEG-DASH 标准只提到了一个 timeShiftBufferDepth，它指定了一个片段在可用后多长时间仍然可用服务器.

The MPEG-DASH standard only mentions a timeShiftBufferDepth, which specifies how long after the availability of a segment it is still available on the server.

来自规范:

@timeShiftBufferDepth 指定此表示的时移缓冲区的持续时间，保证可用于类型为动态"的媒体演示.

@timeShiftBufferDepth specifies the duration of the time shifting buffer for this Representation that is guaranteed to be available for a Media Presentation with type 'dynamic'.

规范中根本没有提及DVR.所以 time shift 似乎是 MPEG-DASH 使用的术语.但是，例如 HLS 没有提到 DVR 或 时移.

There is no mention at all of DVR in the spec. So time shift seems to be the term used by MPEG-DASH. However, for example HLS does not mentioned DVR or time shift at all.

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