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利用者:Y717/わーくすぺーす/インテル クイック・シンク・ビデオ

インテル クイック・シンク・ビデオ(Intel Quick Sync Video、Intel QSVとも[1]) は、幾つかのインテルCPUに統合された、ハードウェアによる動画圧縮とコーデック#動画圧縮のコーデック技術。 The name "Quick Sync" refers to the use case of quickly transcoding ("syncing") a video from, for example, a DVD or Blu-ray Disc to a format appropriate to, for example, a smartphone. Quick Sync was introduced with the Sandy Bridge CPU microarchitecture on 9 January 2011.

Quick Sync has been praised for its speed.[2] Eighth Annual MPEG-4 AVC/H.264 Video Codecs Comparison showed that Quick Sync is comparable to x264 superfast preset in terms of speed, compression ratio and quality (SSIM);[3] tests were performed on Core i7 3770 (Ivy Bridge) processor. A benchmark from Tom's Hardware showed that Quick Sync could encode a 449 MB, four minute 1080p file to 1024×768 in 22 seconds. The same encoding using only software took 172 seconds but it is not clear what software encoder was used and how it was configured. The same encoding took 83 or 86 seconds GPU-assisted, using a Nvidia GeForce GTX 570 and a AMD Radeon HD 6870 respectively, both of which are contemporary high end GPUs.[4] Unlike video encoding on a general-purpose GPU, Quick Sync is a dedicated hardware core on the processor die. This allows for faster and more power efficient video processing.[5][6]

Quick Sync, like other hardware accelerated video encoding technologies, gives lower quality results than with CPU only encoders. Speed is prioritized over quality.[7]

Quick Sync is built into some Sandy Bridge CPUs, but for example not on some low-end Sandy Bridge Pentiums or Celerons.[8] The current generation of Quick Sync supports the H.264/MPEG-4 AVC, VC-1 and H.262/MPEG-2 Part 2 video standards.[5] The Ivy Bridge micro-architecture includes a "next generation" implementation of Quick Sync.[9] Quick Sync was first unveiled at Intel Developer Forum 2010 (13 September) but, according to Tom's Hardware, Quick Sync had been conceptualized 5 years before that.[5]

The older Clarkdale micro-architecture had hardware video decoding support, but no hardware encoding support.[2]

Operating system support

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OS X

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Apple added Quick Sync support in OS X Mountain Lion for AirPlay Mirroring and QuickTime X.[10]

Linux

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Quick Sync is not currently supported on Linux. At the moment Intel does not have any plan for implementing support[11] although it has been considered previously.[12] On the other hand, an open source programming manual was released in May 2012[13] which lets third parties make use of the underlying functions instead.[14]

Hardware Decoding

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Preliminary support for Quick Sync hardware accelerated decoding of H.264, MPEG2, and VC-1 video is now available using a ffdshow filter produced by Eric Gur, an Application Engineer at Intel. It has been claimed that in testing it keeps the CPU at its lowest possible frequency to reduce power consumption to maximize battery life for mobile devices while being about twice as fast as libavcodec.[15]

See also

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References

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  1. ^ 佐々山薫郁 (2013年4月4日12:31). “「QSVと単体GPUの同時利用」をWin8環境でサポートしたIvy Bridge向けグラフィックスドライバ「15.31.3.3071」が登場”. www.4gamer.net / Aetas 株式会社. 2013年9月11日閲覧。
  2. ^ a b “The Sandy Bridge Review: Intel Core i7-2600K, i5-2500K and Core i3-2100 Tested”. Anandtech. 2011年9月23日閲覧。
  3. ^ “Eighth MPEG-4 AVC/H.264 Video Codecs Comparison.”. MSU Graphics & Media Lab (Video Group). pp. 135–137 (6.4 Speed/Quality Trade-Off). Template:Cite webの呼び出しエラー：引数 accessdate は必須です。
  4. ^ “Intel's Second-Gen Core CPUs: The Sandy Bridge Review - Quick Sync Vs. APP Vs. CUDA”. Tom's Hardware. 2011年8月30日閲覧。
  5. ^ a b c “Intel's Second-Gen Core CPUs: The Sandy Bridge Review - Sandy Bridge's Secret Weapon: Quick Sync”. Tom's Hardware. 2011年8月30日閲覧。
  6. ^ http://www.anandtech.com/show/4083/the-sandy-bridge-review-intel-core-i7-2600k-i5-2500k-core-i3-2100-tested/8
  7. ^ “H.264 encoding - CPU vs GPU: Nvidia CUDA, AMD Stream, Intel MediaSDK and x264”. Hardware.fr SARL. 2012年5月11日閲覧。
  8. ^ “Intel Pentium Processor G620”. Template:Cite webの呼び出しエラー：引数 accessdate は必須です。
  9. ^ “Intel's Roadmap: Ivy Bridge, Panther Point, and SSDs”. Anandtech. 2011年8月30日閲覧。
  10. ^ “Apple - OS X Mountain Lion”. Apple. 2012年6月11日閲覧。
  11. ^ “Linux support for the SDK”. Post on official Intel forum. 2011年12月26日閲覧。
  12. ^ “Does Intel Media SDK support Linux?”. Post on official Intel forum. 2011年8月30日閲覧。
  13. ^ http://intellinuxgraphics.org/documentation/IVB/IHD_OS_Vol2_Part3.pdf
  14. ^ http://software.intel.com/en-us/forums/topic/311823
  15. ^ “H.264/AVC”. Codecs. ffdshow-tryout.sourceforge.net. Template:Cite webの呼び出しエラー：引数 accessdate は必須です。
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