视频:如何提供真正的直播OTT
在接下来的 直播OTT的挑战是什么?, Net Insight's Per Lindgren discusses what content owners in different verticals (and their viewers) are looking for in their live OTT experiences, and what it takes to meet those expectations.
了解更多关于直播OTT的信息 流媒体东部.
Read the complete transcript of this clip:
每林德格列: We started talking to a number of our existing clients--operators, 电视公司, and production companies--about the problems they had experienced with live OTT delivery. 最明显的, 当然, was the low delay but after talking to many of them they actually said, “我们可以推迟一些时间, but it’s very important for us is that everyone will see it at the same time."
当然, you have certain applications when you are actually at the event, and you want to watch on your mobile device, 你需要有很低的延迟. And if you’re in the betting industry, the lowest possible delay is of the highest importance. But when we talk to broadcasters and TV media companies, 他们说, "What we want is a seamless TV experience. If you can provide the same delays that we experience on the normal platforms, 主屏幕, 那会是最合适的人选."
也, clients offering premium experiences talked about the channel swap times, like in the early IPTV days--actually, OTT方面的情况更糟, where it can take 2-9 seconds to swap between channels. 他们都说, “We want picture-in-picture in the same screen,” so the synchronization is very important. We can't have them unsynchronized, and 当然 we want to have a very resilient stream.
But very many times you also come back to the fast channel change times, 不仅仅是线性服务, 因为他们还说, “What we want to do is have multi-camera experiences, 不同的拍摄角度. People should be their own producers; they should be able to choose their own content.” If you're adding the ability to switch between camera angles, you need very fast channel swap times; that can't take multiple seconds. 所以他们说, "The perfect thing would be if we could use these mobile devices as a kind of remote control so you work with them but when you come down and sit at home on the sofa you cast it up to the set-top box."
要有那么快, 无缝的铸件, not only to Roku or an Apple TV box but actually to the existing set-top boxes would be really nice. Then you can add a lot of things into the apps like the curation recommendations.
减少, delays you have to both look at the client and the segment buffering, 但也要看包装商. So, when we're doing the most optimized streaming, we actually take away the segmentation and work directly on the stream. 然后很多人说, “嗯，听起来很不错, but how can you then do the ABR profiles and work between the ABR profiles?“它运行得很好. It's no problem at all to go between different ABR profiles on a streaming service without segmenting the streams. 现在只剩1了.5秒全ABR支持.
We also make sure that all devices have the same clocks and show the content at the same time. So, in essence, you get full frame synchronization between all devices. That requires that you also have a notion of time at the devices. The typical time protocol today would be MTP. People start talking about PTP and IEEE 1588. 这也是我们要加进去的, that you have the notion of time and you tell when devices are to show the content. This way we can make sure that everyone watches at the same time.
We work with something we call stateful ABR, so that when you are watching a channel on the device, we know what ABR quality that device is capable of handling. The normal thing when changing to another channel is you go down to the lowest quality and you work your way up again. That can be quite annoying when you're switching fast between channels. So we keep the notion of what ABR quality we are at, and you go down one level instead of going down from the start and restart from again. That not only gives us fast channel swap times, but maintains the quality when swapping between the channels.
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