EVS XT nano, Руководство по техническому обслуживанию оборудования, Страница: 25 / 70

Bandwidth and RT Channels at 180 Hz (NTSC SLSM 3x)
Codec
Field
Rate
(Hz)
Video
Bitrate
(Mbps)
Fields/
Block
Block-based
bandwidth
(MB/s)
Max. RT
Channels
Apple ProRes 422 LT 179.82 85 11 43.6 6.8
HD Mjpeg Standard 179.82 100 4 120.0 2.5
HD Mpeg-2 Intra 179.82 100 2 240.0 1.2
DVCPro HD 179.82 100 6 80.0 3.7
AVC Intra 100 179.82 111 5 96.0 3.1
Avid DNxHD® 179.82 145 9 53.3 5.6
Apple ProRes 422 179.82 145 7 68.6 4.3
Avid DNxHD® 179.82 220 5 96.0 3.1
Apple ProRes 422 HQ 179.82 220 5 96.0 3.1
Real-Time Channel Calculation
Rule
The maximum server bandwidth depends on the disks. Based on the assumption that
Seagate disks of 300 GB (10K5) are used in 4+1 raids, the disks will be able to write 300
MB/s, and the maximum server bandwidth is therefore 300 MB/s.
For a mixed configuration with standard and super motion channels on the same EVS
server, the following calculation must be used to ensure that the settings do not exceed
the maximum bandwidth of the server, that is to say 300 MB/s:
(nbr of standard channels x their block-based bandwidth)
+ (nbr of super motion channels x their block-based bandwidth)
Example with Standard and Supermotion Channels
Can I run an XTnano server with 2 record channels (1 super 1 standard) + 2 play
channels (1 super 1 standard) in Avid DNxHD® with a video bitrate of 120 Mbps
in PAL ?
Calculation:
• 1 standard rec/play at 120 Mbps uses 14.9 MB/s
• 1 super motion record/play at 120 Mbps uses 44.5 MB/s
• All channels will use: 2 x 14.9 + 2 x 44.5 = 118.8 MB/s.
Conclusion: this configuration is supported as it is lower than 300 MB/s.
HARDWARE TECHNICAL REFERENCE MANUAL XTnano Server 12.02
4. Software Specifications 17