User manual

Bandwidth and RT Channels at 59.94Hz (NTSC)
Codec
Field
Rate
(Hz)
Video
Bitrate
(Mbps)
Fields/
Block
Block-based
bandwidth
(MB/s)
Max. RT
Channels
XDCAM HD 59.94 50 37 13.0 23.1
Apple ProRes 422 LT 59.94 85 35 13.8 21.7
HD Mjpeg Standard 59.94 100 14 34.3 8.7
HD Mpeg-2 Intra 59.94 100 7 68.6 4.3
DVCPro HD 59.94 100 19 25.3 11.8
AVC Intra 100 59.94 111 35 13.8 21.7
Avid DNxHD® 145 59.94 145 27 17.8 16.8
Apple ProRes 422 SQ 59.94 145 24 20.0 15.0
Avid DNxHD® 220 59.94 220 18 26.7 11.2
Apple ProRes 422 HQ 59.94 220 16 30.0 10.0
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 multi-essence configuration, a similar calculation is used, and the results cannot
exceed the maximum server bandwidth:
(nbr of standard channels x their block-based bandwidth)
+ (nbr of XDCAM channels x their block-based bandwidth)
/(nbr of Lo-Res channels x their block-based bandwidth)
Example with Multi-Essence Configuration
Can I run an XS server with 4 record channels + 2 play channels in the multi-essence
configuration with Apple ProRes 422 HQ with a video bitrate of 220 Mbps and with
XDCAM (with a video bitrate of 50 Mbps) in NTSC?
Calculation:
• 1 standard rec/play at 220 Mbps uses 30.0 MB/s,
• 1 XDCAM record at 50 Mbps uses 13.0 MB/s,
• All channels will use: 6 x 30.0 + 6 x 13.0 = 258 MB/s.
Conclusion: this configuration is supported as it is lower than 300 MB/s.
HARDWARE TECHNICAL REFERENCE MANUAL XS Server 12.05
4. Software Specifications 21