EVS XT2 - AVID Dnxhd and APPLE Prores 422; Introduction; Video Bitrate Compatibility with Avid and Apple Products

XT Series DISK RECORDER - Version 9.00 - Hardware Technical Reference Manual
EVS Broadcast Equipment SA – April 2008
Issue 5.00
11
1.5.7 AVID DNXHD ® AND APPLE PRORES 422
1.5.7.1 INTRODUCTION
EVS XT[2] servers feature a native implementation of the Avid DNxHD®
and Apple ProRes 422 high definition video codecs. This enables native
audio and video file transfers in either direction between the EVS XT[2]
servers, and Avid and Apple post-production tools in High Definition. This
document explains the impact of using Avid DNxHD® and Apple ProRes
codecs on XT[2] servers, on the XNet[2] SDTI network and on the XFile[2]
or XF[2] in terms of storage capacity, number of usable video channels
and network transfers.
For details on how to setup a direct connection between an HD XT[2]
server and an Avid or Apple server, please refer to the specific
documents (EVS_AvidTM_integration_v2.09 or
EVS_Apple_integration_v.2.00).
1.5.7.2 VIDEO BITRATE COMPATIBILITY WITH AVID AND APPLE
PRODUCTS
Avid DNxHD® is standardized at specific bitrates according to 2 profiles:
1. Standard profile: 120Mbps in “PAL” (50Hz) and 145Mbps in “NTSC”
(59.94Hz)
2. High Level profile: 185Mbps in “PAL” (50Hz) and 225Mbps in “NTSC”
(59.94Hz)
Although Avid DNxHD® is standardized at the specific bitrates mentioned
here above, Avid products can seamlessly read DNxHD® files and
streams at other bitrates. DNxHD® pictures at other bitrates than those
defined by the 2 official Avid profiles can also be referred to as “VC-3” as
defined in SMPTE 1019.
To allow users to determine the best balance between picture quality,
storage capacity, number of video channels per server, and network
speed, EVS XT[2] servers can generate Avid DNxHD® files and streams
at any given bitrate between 20Mbps and 220Mbps. These files and
streams should remain compatible with Avid production tools.
Apple ProRes 422 is also standardized at specific bitrates according to 2
profiles:
1. Apple ProRes 422 (also sometimes referred to as Apple ProRes 422
SQ): 120Mbps in “PAL” (50Hz) and 145Mbps in “NTSC” (59.94Hz)
2. Apple ProRes 422 HQ: 185Mbps in “PAL” (50Hz) and 225Mbps in
“NTSC” (59.94Hz)