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Author Topic: HDSDI Inputs
Harold Hallikainen
Jedi Master Film Handler

Posts: 906
From: Denver, CO, USA
Registered: Aug 2009


 - posted 01-04-2017 03:56 PM      Profile for Harold Hallikainen   Author's Homepage   Email Harold Hallikainen   Send New Private Message       Edit/Delete Post 
Many internal servers include a dual HD-SDI input. Is anyone using these? What for?

Thanks!

Harold

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999


 - posted 01-04-2017 04:26 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
HDCAM/HDCAM-SR come to mind but in general terms, anytime broadcast or civilized video is to be connected. My guess, just like the LTC outputs, 99.9% of the people pay no attention to them.

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Jim Cassedy
Phenomenal Film Handler

Posts: 1661
From: San Francisco, CA
Registered: Dec 2006


 - posted 01-04-2017 04:51 PM      Profile for Jim Cassedy   Email Jim Cassedy   Send New Private Message       Edit/Delete Post 
One of the venues I work at uses the HD-SDI inputs for HD-CAM, as Steve says.
That particular location does a lot of Asian-themed screenings and festival
work, and we still seem to get a lot of HDCAM content from Japan, so we've
got a macro on the projector for it and use it fairly often.

Same place also has a mac-pro occasionally used for playback of Pro-Res
and other computer format files, and they've actually got a card in that
computer that outputs SDI, so we've got an SDI switcher to route either
the computer output or the HDCAM deck into the SDI input on the projector.

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Harold Hallikainen
Jedi Master Film Handler

Posts: 906
From: Denver, CO, USA
Registered: Aug 2009


 - posted 01-04-2017 07:22 PM      Profile for Harold Hallikainen   Author's Homepage   Email Harold Hallikainen   Send New Private Message       Edit/Delete Post 
I'm not familiar with HD-CAM. Can HDMI serve that purpose?

Harold

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Leo Enticknap
Film God

Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000


 - posted 01-04-2017 08:15 PM      Profile for Leo Enticknap   Author's Homepage   Email Leo Enticknap   Send New Private Message       Edit/Delete Post 
All the broadcast standard HDCAM and HDCAM SR VTRs I've used have HD-SDI as the only digital video output. If you need to hook one up to an HDMI input (e.g. on a cat745), you'd need to go through either a scaler or an SDI to HDMI converter box.

We use the dual-link HD-SDI inputs on our Barco Alchemy to take the input from an Aja FS-2 scaler, to which all our alternative content sources are connected.

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Scott Norwood
Film God

Posts: 8146
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99


 - posted 01-04-2017 09:34 PM      Profile for Scott Norwood   Author's Homepage   Email Scott Norwood   Send New Private Message       Edit/Delete Post 
Pretty much every "film" festival needs the HD-SDI input. As others have said, it gets used by videotape decks, computers, hard-disk and/or solid-state playback devices (AJA Ki-Pro, Sound Devices Pix series), and digital signage players.

The nice thing about HD-SDI is that, unlike DVI/HDMI, it can be run for great distances without worry (especially important if the projector is not located in the booth) using relatively inexpensive cables and is very reliable.

Since Steve mentioned it: what is the LTC output? Linear timecode? Something else? I have never seen it used, although I could see timecode being useful for automation purposes.

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 01-05-2017 08:35 AM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
SMPTE LTC, for various purposes. Some servers have it per default, some as an option. As Steve says, it is not used very often. Aside from these server supplied LTC sources, there is also a new standard for Sync-Tracks on the DCP audio channels, Harold knows about it.

ATMOS and d-box so far use proprietary sync formats on some DCP channels. Some of them suffer from the watermarking that usually had to be active on all audio channels. That is solved now by the use of special KDMs that allow to disable watermarking for specific channels, leaving their digital TC data untouched.

The trouble with the IMB and IMS systems is, for good reasons, they leave out the expensive option for an HD-SDI input with Enigma based decryption. But having HDMI is not enough (although HD-SDI->HDMI converters can deal with some applications). Some IMB systems also use(d) combined HD-SDI output/input for stacking applications.

- Carsten

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Kristo Nalo
Film Handler

Posts: 24
From: Skopje, MK, MK, Macedonia
Registered: Nov 2016


 - posted 01-05-2017 11:36 PM      Profile for Kristo Nalo   Email Kristo Nalo   Send New Private Message       Edit/Delete Post 
I encounter the same situations too. My friends help me to fixed it and until now I never encounter that again.

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