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As you can see, you can mix the two codecs in a single playlist just as you could include video encoded using different H.264 profiles.
#Wwdc 2017 live stream how to
Mixing HEVC and H.264 in a Master Playlistįigure 4 details how to combine HEVC and H.264 in a single HLS presentation defined by a master playlist files. The rest of the slide deals with notification requirements for HEVC encoded content in the HLS manifest files, which is straightforward. So, while you can reuse your encoded fMP4 fragments for DASH and HLS, you'll still need two delivery payloads for encrypted content-one for CBC, and the other for Counter Mode (CTR) used in PlayReady. Second, Apple will continue to use CBC (cipher block chaining) encryption, which has been adopted by Google in Widevine, but not (so far) by Microsoft in PlayReady.
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First, and most important, HEVC must be packaged in the fragmented MP4 format Apple adopted when it added support in HLS for the Common Media Application Format (CMAF) at last year's WWDC. Other HEVC Implementation Detailsįigure 3 covers several additional implementation details. Yet another presentation, "I ntroducing HEIF and HEVC" (Session 503), presented by Gavin Thomson and Athar Shah, details that beyond HLS, Apple's HEVC decoders can play HEVC encoded video in either a QuickTime or MP4 wrapper. This presentation also discusses many additional changes to the HLS specification and associated tools, and is worthwhile for anyone creating HLS content.
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Though not listed on the slide, at 4:15 in the presentation, Pantos states that the Apple TV will also receive a software update that enables HEVC playback, which you can confirm at Apple's tvOS Guide.Ī different presentation, Session 515, the " HLS Authoring Update," noted that all software and hardware decoders support up to Main 10 Profile, Level 5.0, and the High Tier.
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So, sending HEVC streams to the iPhone 5s, iPhone 6, and iPhone 6 Plus will likely significantly reduce their battery life for newer devices, HEVC should have minimal effect. The iPhone 6S models use the A9 CPU, while the iPhone 7 uses the A10 Fusion, which presumably will also include HEVC hardware-based decode. Which devices does this impact? Looking at iPhones only, according to Wikipedia, the iPhone 5s uses the A7 CPU, the iPhone 6 and 6 Plus use the A8 CPU, so playback will be in software. software support for HEVC in iOS 11 and MacOS On a positive note, on devices with HEVC and H.264 hardware support, the TechSpot article found very little difference in battery life when playing the two formats.įigure 2. Until proven otherwise, I would expect similar decreases in battery life with Apple mobile devices and notebooks using software-only HEVC decode.
For example, tests on a Dell notebook performed by TechSpot found a 39% drop in battery life when playing HEVC without hardware support as compared to H.264 with hardware support. iOS devices compatible with iOS 11Īs shown in Figure 2, Apple will support HEVC via a combination of hardware and software decoding, and you should expect software decoding to consume more power and shorten battery life. Figure 1 identifies all devices that will be compatible with iOS 11.įigure 1.
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First, Apple will support HEVC in High Sierra, the next MacOS, and iOS 11, and both will be available as free upgrades this fall. I gathered much of the information presented below from WWDC Session 504, "Advances in HTTP Live Streaming," by Roger Pantos, the original author of the HLS specification, and Anil Katti, both AV Foundation engineers. HEVC Support in High Sierra (macOS) and iOS 11 I'll also discuss the new subtitle format supported in HLS, and a new image format that Apple launched. In this article, I'll focus on exactly what Apple announced regarding HEVC and its implications from a technical perspective. Streaming Media's Dan Rayburn covered the significance of that announcement to the market as a whole in his article, " Why Apple's HEVC Announcement Is A Big Step Forward For The Streaming Media Industry." You can tell from the title that Rayburn thinks it's a big deal, and I agree. From a codec perspective, the key announcement at Apple's Worldwide Developer Conference (WWDC) 2017 was the inclusion of HEVC into HTTP Live Streaming (HLS).
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