Chromecast是否支持MPEG-DASH清单中的TS容器格式 [英] Does Chromecast support the TS container format in MPEG-DASH manifest

问题描述

在他们的开发人员文档中，他们说他们支持以下内容：

In their developer documents, they say they support the following:

•容器：MP4 / CENC，WebM，MPEG-DASH， SmoothStreaming

• Containers: MP4/CENC, WebM, MPEG-DASH, SmoothStreaming

但是，MPEG-DASH和SmoothStreaming是允许各种容器的流协议。 MPEG-DASH规范允许使用MPEG2-TS块，但是在DASH清单中看不到有关受支持的容器格式的任何信息。

However, MPEG-DASH and SmoothStreaming are streaming protocols that allow for various containers. The MPEG-DASH spec allows for MPEG2-TS chunks, but I don't see any information regarding supported container formats inside of a DASH manifest.

推荐答案

我猜不会。 DASH规范确实说它支持TS容器，但是我还没有看到实现的方法。 DASH完全是按社区设计的工作，它们将所有内容都包含在规范中。实际上，它们包含了太多。 DASH的一个子集称为 DASH 264，这似乎是每个人都向往的方向。平滑流和DASH 264使用几乎相同的媒体格式，但使用不同的清单格式。该文件格式基本上是MP4，其中的mdat片段与曲调交错插入（ http://alexzambelli.com/blog/2009/02/10/smooth-streaming-architecture/ ）。 Google出于政治原因（试图推出自己的替代编解码器，从而使MPEG-LA诚实）而将WebM包括在内。

Im am going to guess no. The DASH spec does say it supports TS containers, but I have yet to see an implementation do so. DASH was very much a design-by-commity effort, and they included everything into the spec. In fact they included too much. a subset of DASH called 'DASH 264' seems to be what everyone is gravitating toward. Smooth Streaming and DASH 264 use near identical media formats, but different manifest formats. the file format is basically an MP4 with a fragmented mdat interleaved with a moof (http://alexzambelli.com/blog/2009/02/10/smooth-streaming-architecture/). Google includes WebM because of political reasons (trying to push an alternative codec own and thus keep MPEG-LA honest).

TS是一种专利保护格式。因此，通过将其包含在内，Google需要向MPEG-LA支付版权费，而且我认为他们正在避免这种额外费用。

In addition, TS is a patent encumbered format. So by including it google would need to pay royalties to MPEG-LA, and I am assuming they are avoiding that extra cost.

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