Video: Do We Still Need Adaptive Bitrate Streaming?
As codecs get more efficient and general throughput grows, is adaptive bitrate (ABR) streaming not the necessity it once was to guarantee a successful stream to a broad base of end users? 流媒体 West panelists Will Law of Akamai, 雅虎的Omer Luzzatti, and Mark Arana weigh in on where, 当, 以及为什么ABR仍然重要.
Learn more about streaming delivery at 流媒体东部.
将法律: 为什么我们需要ABR? It's an artifact of two things. We're delivering over the general internet, which doesn't have a fixed quality of service--it does vary. Also, the codecs we're using are lossless. We can't degrade the quality dynamically to accommodate a fluctuation in through port, and therefore we have to change the quality level completely. That's the definition of adaptive delivery. It's an artifact of using a general internet where you don't control all the delivery components. I think it's here to stay for a while. 我确实希望, as we get tighter control over delivery, we'll expect the number of bitrates that we might have to contract a little bit. We won't get the variation in throughput that we have to deal with today.
俄梅珥Luzzatti: Adaptive delivery started around 2009, mainly by Apple. HTTP protocol with adaptive on top of it. The idea was that you can improve quality or reduce quality according to the network behavior. Adaptive bitrate has been used in almost everywhere; obviously, we use HLS. We improve adaptive bitrate, algorithms, and so on. It is not the case that adaptive bitrate should be used always. 再一次。, I'm going back to the examples of short formats, 尤其是在30秒以下, 可以使用MPEG-4, one could try and analyze the network condition beforehand, and use only one of three or four qualities of MPEG-4 that the content owner provides. A way for longer than 30 seconds adaptive bitrate is required and is very much recommended.
马克Arana: When you're looking at a worldwide audience, constrained bandwidth still is one of those key issues to overcome. Not everybody has Google Fibre going to their home or certainly over wireless networks, and so adaptive bitrate is a key component to a great user experience. For our long filmed content, our content is anywhere from 70 to 120 minutes for our feature films. 这是一个关键因素. We have a lot of people that are viewing our movies on one of our applications. Disney movies, anywhere, have 18 different profiles that we use for three different resolutions. That is and a good compression scheme are one of the key ways to making sure we maintain that great user experience. We get very excited about having fewer files. 像CMAF这样的东西非常, very attractive to us so that we can start to consolidate the number of files that we have on our CDN.
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