There’s a lot of interest in ultra-high definition (UHD) video, and the two codecs that drive it, HEVC and VP9. Over the past few months, a new UHD codec called Daala has also come to the fore. I wanted to take this opportunity to update the status of HEVC and VP9 and introduce you to Daala. By way of background, HEVC/H.265 is the royalty-encumbered, standards-based successor to H.264, while is the free, open-source codec from Google.

In case you hadn’t heard, MPEG LA has announced its proposed royalties for HEVC, which includes a $0.20/unit charge on encoders and decoders, with the first 100,000 units excepted. The maximum yearly charge is $25 million, a substantial boost from H.264’s $6.5 million. For content producers, however, there will never be content-related royalties, even for video distributed via pay-per-view or subscription. So if you’re a content producer, your next two questions are likely “how does the quality compare?” and “where will the two codecs play?” Even though I’ve tested multiple HEVC codecs, none of the encoders that I typically work with support the VP9 codec. I could use FFMPEG, but command lines aren’t my thing, particularly when attempting to produce files for quality comparisons.

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So, I checked for objective third-party comparisons and found several, all of which find that HEVC offers superior quality to VP9, though by varying degrees. One study, headlined by Dan Grois, a senior member of the IEEE, was presented at the 30th Picture Coding Symposium in December 2013. Grois and his group compared the quality of HEVC, x264, and VP9, and found that, “according to the experimental results, the coding efficiency of VP9 was shown to be inferior to both H.264/MPEG -- AVC and H.265/ MPEG -- HEVC with an average bitrate overhead at the same objective quality of 8.4 percent and 79.4 percent, respectively.” Another study produced by Maxim P. Sharabayko, a postgraduate student at Tomsk Polytechnic University in Russia, compared the quality of x.264, HEVC, VP9, and Daala. Regarding the first three, Sharabayko found “while [HEVC] provides 31 percent better compression rates in keyframe-only mode and about 40 percent improvement in intercoding mode compared to [x264], VP9 is only 18 percent better than [x264] in both modes.” In terms of where the two codecs play, VP9 unsurprisingly has the early advantage in browser compatibility, with support in Google Chrome, Opera, and Mozilla Firefox.