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|Full name||Apple ProRes 422 Proxy|
Apple ProRes 422 Proxy is the fourth-highest data-rate version of the ProRes 422 codecs. Apple literature highlights the value of Apple ProRes 422 Proxy in support of post-production work, stating that it is "intended for use in offline workflows that require low data rates but full-resolution video."
In order to compare the members of the ProRes 422 family, this Web site uses 10-bit picture data with an HD (1920x1080) frame size and a frame rate of 29.97 fps. Uncompressed, this yields about 560 GB per hour. Although the variable bit rate for ProRes means that results will vary, specialists report that the 45 Mbps target data rate for Apple ProRes 422 Proxy would yield a one-hour file of about 20 GB.
See the Apple ProRes 422 Codec Family for a general description of the shared technical characteristics as well as history of the format.
|Production phase||Production (initial state) and post production (middle state).|
|Relationship to other formats|
|Subtype of||Apple_ProRes_422_Codec_Family, Apple ProRes 422 Codec Family|
|LC experience or existing holdings|
|LC preference||The Library of Congress Recommended Formats Statement (RFS) does not include Apple ProRes 422 Proxy. However it does include Apple ProRes 4444, 4444 XQ and 422 HQ in a QuickTime wrapper as a Preferred format for Video - File-Based and Physical Media.|
|Licensing and patents||See Apple_ProRes_422_Codec_Family|
|External dependencies||See Apple_ProRes_422_Codec_Family|
|Technical protection considerations||See Apple_ProRes_422_Codec_Family|
|Normal rendering||See Apple ProRes 422 Codec Family|
|Clarity (high image resolution)||Good. Primarily used as a high quality edit or viewing proxy; may be used as a final state deliverable where small file sizes are required.|
|Functionality beyond normal rendering||See Apple ProRes 422 Codec Family|
|Filename extension||See note.||See Apple_ProRes_422_Codec_Family|
|FOURCC||Big endian: apco
Little endian: ocpa
|FOURCC code used to indicate ProRes 442 Proxy in the QuickTime container according to Multimedia Wiki.|
|General||See Apple ProRes 422 Codec Family|
Apple ProRes 422 Proxy is so named because it serves as the high-quality edit proxy for Final Cut Server.