EVS XT nano, Руководство по техническому обслуживанию оборудования

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4.3.3. Internal Bandwidth
General Description
This section helps you select the most appropriate bitrate for the native codec(s) on the
EVS server, on the basis of the internal bandwidth, the channel configuration, and the
calculated number of real-time channels at the EVS server level.
The section therefore presents tables including the following parameters:
1. Video Bitrate: codec bitrate set by the user in the Codec section of the Server tab in
the Multicam Configuration window.
2. Fields/Block: numbers of video fields that can be stored in one disk block of 8 MB,
taking into account 8 audio track, in 1080i.
3. Actual Bandwidth: actual disk/network bandwidth required for the real-time record or
real-time playback of one video stream and its associated audio tracks.
4. Max. RT Channels: maximum number of video channels (real-time record or real-
time playback) that one EVS server can support for a given frame rate and bitrate.
The RT Channels calculation is based on the use of Seagate disks of 300 GB (10K5)
configured in 4+1 raids. Such disks are able to write 300 MB/s.
Bandwidth and RT Channels at 50 Hz (PAL)
Codec
Field
Rate
(Hz)
Video
Bitrate
(Mbps)
Fields/
Block
Block-based
bandwidth
(MB/s)
Max. RT
Channels
Apple ProRes 422 LT 50.00 85 34 11.8 25.4
HD Mjpeg Standard 50.00 100 12 33.4 9.0
HD Mpeg-2 Intra 50.00 100 6 66.7 4.5
DVCPro HD 50.00 100 17 23.6 12.7
AVC Intra 100 50.00 111 14 28.6 10.5
Avid DNxHD® 120 50.00 120 27 14.9 20.1
Apple ProRes 422 50.00 120 24 16.7 17.9
Avid DNxHD® 185 50.00 185 18 22.3 13.4
Apple ProRes 422 HQ 50.00 185 16 25.0 12.0
HARDWARE TECHNICAL REFERENCE MANUAL XTnano Server 12.02
4. Software Specifications 15