SDI to Optical - Transmission Standard

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John Kane

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SDI to Optical - Transmission Standard

PostMon Apr 05, 2021 9:33 pm

Hi

Does anyone know if there is an industry wide standard for digital video over fibre.
Could I use a Blackmagic SDI to Optical at the source end and any other company's Optical to HDMI at the screen end?
John Kane
VITC Video
Christchurch, New Zealand
1 x 4K 2M/E, 1 x Videohub 40x40, many mini converters
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Jack Fairley

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Re: SDI to Optical - Transmission Standard

PostTue Apr 06, 2021 2:24 am

SDI is done with SMPTE ST 2082 for 12G, and SMPTE 297-2006 up to 3G. I would not expect the HDMI converter to work, but you could always convert back to SDI and then to HDMI.
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Andrew Kolakowski

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Re: SDI to Optical - Transmission Standard

PostWed Apr 07, 2021 12:11 pm

Yes, there is a standard which "converts" video/audio data or actual SDI as whole into IP signal.
All covered in SMPTE ST 2110 (and SMPTE 2022-6). Standard covers sending uncompressed or lightly compressed data as Jpeg2000 etc.
https://www.smpte.org/smpte-st-2110-faq
You have already plenty products which allow you to convert SDI/HDMI to IP signal and later "on other side" back. Most of them are done according to this standard so you should be able to mix products- this is whole point of the standard.

I think all BM devices use SDI over IP protocol, so basically a way to use fibre cable to link devices at long distances. It's rather SMPTE 2022-6, but of course BM doesn't even say what it's. Not very professional.
Last edited by Andrew Kolakowski on Wed Apr 07, 2021 1:36 pm, edited 2 times in total.
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Andrew Kolakowski

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Re: SDI to Optical - Transmission Standard

PostWed Apr 07, 2021 12:47 pm

If you have closed area and local network infrastructure then you should look at NDI. This is very simple and easy to implement solution. For HD you can use 1gig network (up to 6-7 streams). For UHD you need 10gig network (unless it's just 2-3 signals).
Beauty is that it's mainly all plug and play and you have signals accessible in your network everywhere by many devices which support NDI.
Small example.
You have eg. 4 cameras (each camera feeds HDMI/SDI ->NDI converter (which is tiny box), signal from converter go to your 1gig switch. You may have some switcher etc. to do pre-editing and then you also convert this (output) to NDI signal. All of those signals are in your network (with timecode and of course audio) and you can monitor/record it to native NDI codec (which is sort of ProRes alike). While performance/recording is going you can edit all cameras + mix output as multicam project in Premiere (on growing files) to produce some final (after show) master, which is ready quickly after show is finished. It's all very neat and easy to setup. You can even take any fo those NDI signals and stream as live online feed- there are ready products for this. Most solutions is very affordable or even free.
It's so different approach to using many disk recorders, then taking files to NLE etc. So much nicer and more powerful.
I expect Resolve getting NDI support soon.

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