The Future of HEVC: It's Coming, but with Plenty of Questions
HEVC is the next-gen compression technology lauded as the enabler for a host of new services and capabilities. I discuss the historical development of HEVC and its technical underpinnings in my article “What Is HEVC (H.265)?”
In this article, I’ll briefly review those findings and focus on how quickly HEVC will make a mark in streaming media and OTT markets.
HEVC: What We Know
According to multiple studies, HEVC should deliver up to 50% better compression than H.264 in video on demand (VOD) applications, which means similar quality at half the bitrate. In live encoding, which obviously has to be performed in real time, the initial expectations are a 35% bandwidth reduction at similar quality levels. Alternatively, HEVC can also enable larger resolution movies, whether 2K or 4K.
Essentially, these are the two benefits of HEVC in the streaming space. The first relates to encoding existing SD and HD content with HEVC rather than H.264, enabling cost savings and/or the ability to stream higher quality video to lower bitrate connections. The second relates to opening up new markets for ultra-high-definition (UHD) videos.
On the playback side, there are multiple data points, but no real clear picture. Several companies have announced software decoders, but it’s unclear how much horsepower is necessary to drive them. The original targets for HEVC were 10x encoding complexity and 2x–3x decoding complexity as compared to H.264, and most sources have confirmed the 10x figure for encoding. Perusing various comments from various sources, decoding complexity has ranged from “same as H.264” to the 2x–3x figure.
Remember, however, that H.264 playback is accelerated in hardware on most playback platforms, including GPU-accelerated playback on computers. According to my source at graphics vendor NVIDIA, “There currently isn’t any dedicated [hardware] support for HEVC in our current GPUs. I’m pretty limited to what I can say about future products. But I’ll just say that our goal is for our GPUs to support all current video standards. Now, that said, it is quite possible for third parties to write HEVC encoders and decoders using CUDA to use the processing capability of current GPUs.”
Though GPU acceleration may be coming, it isn’t here yet, so H.264 and HEVC aren’t on a level playing field when it comes to accessible playback hardware. Still, according to a source at Qualcomm, Inc., “[W]e are able to get 1080p, 30fps HEVC Main profile video with just a little bit over 50% CPU utilization on a quad-core architecture.”
On the mobile side, my source reported, “At CES we showcased Ittiam’s ARM based decoder and played back 1080p HEVC and 1080p H.264 videos side by side on recently announced Snapdragon 800 platform. Ittiam’s decoder is still in development and will get further enhancement.” You can see a video of HEVC playing back on the Qualcomm Snapdragon platform from the Mobile World Congress 2012 at go2sm.com/qualcomm.
According to a report titled “HEVC Decoding in Consumer Devices,”
senior analyst Michelle Abraham from Multimedia Research Group, Inc. estimated that the number of consumer devices that shipped in 2011 and 2012 that would be capable of HEVC playback with a software upgrade totaled around 1.4 billion, with more than a billion more expected to be sold in 2013. According to Abraham, in compiling these statistics she assumed that all PCs shipped in each year would be HEVC-capable.
I spoke with several encoding companies; many were bullish on HEVC and have either made HEVC-related product announcements (Elemental Technologies, Inc.) or will at NAB. Another made the very cogent comment that the encoding side was always ahead of the game and that the path to actual producer adoption is widespread playback availability.
Speaking of playback, none of the major players -- Adobe, Apple, Google, or Microsoft -- have announced HEVC playback support in their respective players, browsers, or mobile or desktop operating systems. One reason why -- and a potential monkey wrench in at least the short-term HEVC adoption cycle -- is that no one knows what it will cost to use HEVC.
Royalty Issues with HEVC
What’s clear at this point is that multiple companies have patents relating to HEVC technology, and they plan to ask for royalties from those who use their technology. This was the case with H.264 as well, and though many in the streaming industry grumbled about the royalties, this disgruntlement certainly didn’t limit H.264’s success.
Two things are different with HEVC. First, where H.264 involved a single group of patent holders administered by MPEG LA, it appears that some HEVC patent holders want to pursue royalties outside of a patent group, which will make it more challenging for HEVC users to license the technologies. According to “Patent Snafus Could Delay New Video Codec,”
Mediatek and Qualcomm do not want to join the HEVC group formulated by MPEG LA, and Samsung hasn’t decided either way.
One chipmaker executive, speaking anonymously for the EE Times article, commented, “HEVC has so many patent holders and some of them say they will not be part of the pool but want to collect royalties themselves. If say 20 people all want to collect royalties it will kill the standard -- we need a fixed cost, it cannot be variable,” he added.
Beyond this uncertainty, HEVC is coming to the streaming media market much faster than H.264, where royalty policies were in place well before any significant market adaption. To recount, the H.264 spec was approved in March 2003, and MPEG LA announced licensing terms
in November 2003. Obviously, when Apple announced support for H.264 in QuickTime 7 in April 2005, royalty policies were firmly in place. Ditto for when Adobe announced that it would include H.264 in Flash in March 2008, and when Microsoft added H.264 to Silverlight in July 2009.
Our contact at MPEG LA reported that while the HEVC group had met three times as of February 2013, there was still no guarantee that a group would be formed or that all patent holders would join the group. So it appears that HEVC early adopters will have to decide to implement the technology without knowing the cost.
For large companies such as Adobe, Apple, Google, and Microsoft, that might be tenable; the H.264 license was capped, and it’s reasonable to assume that the HEVC license will also be capped. All four companies can amortize that cost over millions of product units shipped, and I think it’s highly likely that one or more of these companies will announce HEVC integration by NAB.
Even the encoding companies that I spoke with commented that they might incorporate HEVC technologies into their encoding tools without knowing the cost, because, as one exec said, “[S]upporting new formats is the race that we run.” The exec also noted, however, that this was the first time that they were ever forced to consider embracing a codec without having an idea about the licensing structure.
However, let’s get back to the two potential benefits that actual publishers seek from HEVC: cost savings and opening up new products and services. In both cases, it seems unlikely that any producer would use HEVC-encoded video without a known cost structure. Sure, H.264 usage for free internet video is free, but that decision was made under a completely different set of circumstances, and it’s doubtful if HEVC usage will be similarly unencumbered.
How H.264 Became Free
A short history lesson will explain why H.264 became free. When the terms of the initial H.264 license were announced, there was a royalty on H.264-encoded video deployed in a pay-per-view or subscription operation. The royalty was not on free internet video, at least through the initial term of the license, which ended Dec. 31, 2010.
The licensing terms attributed this waiver to the fact that the internet streaming market was “still developing,” though this is likely disingenuous. The fact of the matter was that the H.264 implementations of that time offered only a slight quality improvement over VP6, the predominant Flash codec, and required more CPU horsepower for playback. There was also no mobile platform such as iOS or Android that wasn’t compatible with VP6 that could force producers to use H.264. So 99% of producers were satisfied with VP6 and wouldn’t have experimented with H.264 if there was a royalty involved.
In February 2010, MPEG LA extended the royalty moratorium for free internet video through December 2016. In an interview with Streaming Media
, MPEG LA president and CEO Larry Horn
attributed this decision to the fact that “[t]hough some companies are doing well with advertising supported video, overall the models are still in flux, and the patent group didn’t want to plug a royalty into a business model that’s still unsettled.”
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What makes the HEVC codec the future of online video? At Streaming Media East, Elemental explained it's the bandwidth savings that matter.
Encoding and video processing specialists are highlighting their H.265/HEVC solutions at next week's NAB show in Las Vegas
While previous jumps in compression technology have taken years to find adoption, we may see PCs and other devices that can play HEVC files on the market by the end of 2013
Not sure what to make of the new format on the block? Read this to get up to speed on how HEVC was created, the challenges it now faces, and when it will go into everyday use.