AJA Ki Pro Rack - Manual (Page 9)

Ki Pro Rack v4.2 www.aja.com 9
Apple ProRes 422 Advantages
Quality using Apple ProRes 422 is excellent—broadcast quality. Captured media is
virtually indistinguishable from pristine uncompressed sources. Better yet, ProRes
maintains the quality during editing, surviving multiple encoding/decoding generations
without degradation. It was designed by Apple for editing, rather than as a transmission/
distribution codec as are most popular codecs. Some of the advantages include:
• Full-size 1920-by-1080 and 1280-by-720 HD resolutions.
• Full-size 720-by-486 and 720-by-576 SD resolutions.
• 4:2:2 chroma sampling. Provides precise compositing and blending at sharp saturated-
color boundaries.
• 10-bit sample depth. Preserves subtle gradients of 10-bit sources (perfect for green-
screen compositing, graphics or color correction) with no visible banding artifacts.
• I frame-only encoding. Ensures consistent quality in every frame and no artifacts from
complex motion.
• Variable bit-rate (VBR) encoding. “Smart” encoding analyzes the image and allocates
more bits to complex frames.
• Low data rate requirements make for more storage options and require less drive space
to store high quality video.
• Optimized for efficient Real-Time effects.
Data rates: • 220 Mb/second Apple ProRes 422 (HQ)
• 145 Mb/second Apple ProRes 422
• 100 Mb/second Apple ProRes 422 (LT)
• 36 Mb/second Apple ProRes 422 (Proxy).
NOTE: Apple ProRes 422 (Proxy) is for high-quality offline editing at the original frame size, frame
rate, and aspect ratio.
Avid DNxHD Advantages
Quality using Avid DNxHD is excellent—HD quality encoding without high bandwidth
requirements. Avid DNxHD was designed for non-linear post-production and
broadcastmto withstand multi-generational processing.
• Full-size 1920-by-1080 and 1280-by-720 HD resolutions.
• 4:2:2 chroma sampling.
• 10-bit sample depth (for DNxHD 220x) or 8-bit.
• Every frame of encoding is independent.
• Variable bit-rate (VBR) encoding.
• Low data rate requirements.
Data Rates: • 220 Mb/second
• 185 Mb/second or 175 Mb/second when DNxHD 220x has been selected (Mb/second
varies depending upon the format and frame rate)
• 145Mb/second
• 120 Mb/second or 115Mb/second when DNxHD 145 has been selected (Mb/second
varies depending upon the format and frame rate).