ArticleID:52,SW,8th May 2009
Info:
Many user have asked us about the new and upcoming HD-SDI card and its capabilities, supported formats and especially latency.
Please contact your dealer or the Green Hippo sales team for information on the availability of the HD-SDI input.
Test Setup:
A Mac with Final Cut Pro was used to generate a HD-SDI signal with time code running. The timecode was used at highest possible temporal resolution i.e. Base 60 for all 30/60fps format and base 50 for 25/50fps The HD-SDI signal was sent to the Hippotizer input as well as to a JVC HD-SDI monitor (zero latency). The Hippotizer output was connected to a CRT monitor via VGA (zero latency). A HD-SDI camera was set up to film both monitors and record at 720p60 or 50 depending on the time base used.
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For each format a long sequence was recorded with 3 different load settings for the Hippotizer, light medium and heavy. |
light: | only single layer showing HD-SDI input was running, no video clips playing, fps at 60 |
medium: | 3x 1280x720 clips were running at the same time at 100% speed, fps at 60 |
heavy: | 3x 1280x720 clips were running at the same time at 400% speed ( = 12 clips) plus 6x full blur, fps dropped to 50 |
Latency:
Format | Time Base
| Delay in frames (light load)
| Delay in frames (medium load)
| Delay in frames (Heavy load) | in ms |
1280x720p | 60 | 3 | 3-4 | 3-4 | 50-67 |
| 50 | 3 | 3 | 2.5-3 | 50-75 |
1920x1080i | 30 | 2.5 | 2.5 | 2-2.5 | 67-83 |
| 25 | 2-2.5 | 2-2.5 | 2-2.5 | 80-100 |
PAL SD | 25 | 2-2.5 | 2-2.5 | 2-2.5 | 80-100 |
NTSC SD | 30 | 2-2.5 | 2-2.5 | 2-2.5 | 67-83 |
The HD-SDI input card is auto-configuring so there are no settings. The current implementation only supports a single card, multiple card support will follow soon.
Formats supported:
480i/59.94
576i
720p/23.98
720p/24
720p/25
720p/29.97
720p/30
720p/50
720p/59.94
720p/60
1035i/59.94
1035i/60
1080i/50
1080i/50M
1080i/59.94
1080i/60
1080p/23.98
1080p/24
1080p/25
1080p/29.97
1080p/30
1080sf/25
1080sf/29.97
1080sf/30
