- ProRes 422
ProRes 422 is a high-definition lossy
video compression format developed byApple Inc. for use inpost production . It was announced on15 April 2007 during the keynote speech at the NAB convention. ProRes 422 was introduced with the new [http://www.apple.com/au/finalcutstudio/finalcutpro/support.html Final Cut Studio 2] .It is DCT based, and is therefore simpler to decode than distribution oriented formats like
H.264 .Key features
* Full-width 1920x1080 and 1280x720
* chroma sampling
* 10-bit sample depth
* I frame-only encoding
* Variable bit-rate (VBR) encoding
* Normal 145Mbit/s and High-Quality 220 Mbit/s for HD resolution at 60i
* Normal 42Mbit/s and High-Quality 63 Mbit/s for SD resolution at 29.97
* Fast encoding and decoding (both at full size and half size)Intermediate codecs
ProRes is an intermediate codec, which means it is intended for use during video editing, and not intended or practical for end user viewing. The benefit of an intermediate codec is that it retains higher quality than end user codecs while still requiring much less expensive disk systems compared to uncompressed video.
Other intermediate codecs include those made by
Cineon and Avid.A similar technology was unveiled three years earlier, by Avid Technology in September 2004.
DNxHD codec also allows 10-bit HD over firewire, also supports full-width 1920x1080 and 1280x720, uses 4:2:2 chroma and has target bit-rates of 145 and 220 Mbit/s.Playback
Apple on 08/28/2008 introduced a new free ProRes QuickTime Decoder for both [http://www.apple.com/support/downloads/appleproresquicktimedecoder10formac.html Mac] and [http://www.apple.com/support/downloads/appleproresquicktimedecoder10forwindows.html Windows] that allows users to play Apple ProRes files through QuickTime.
ee also
*
Final Cut Studio
*Final Cut Pro
*DNxHD codec External links
* [http://images.apple.com/finalcutstudio/resources/white_papers/L342568A_ProRes_WP.pdf ProRes 422 white paper]
* [http://www.apple.com/finalcutstudio/ Final Cut Studio] site at [http://www.apple.com Apple.com]
Wikimedia Foundation. 2010.
