"Security track" for video, why not?

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Kim Janson

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"Security track" for video, why not?

PostTue Sep 28, 2021 5:19 am

I have been following the "New iPhone. Better than a BM Camera? " viewtopic.php?f=2&t=147406
and maybe too actively and out of scope also participated :D

Couple of ideas have raised regarding normal cameras, and I do wonder why do we not have "security track" for video.

the principle would be simple, the recording speed would be double, every second frame would be with lower ISO (if possible to alternate that fast) or lower exposure time.

So if wanting to shoot 24 fps, 180 degree shutter and 3200 ISO,

the camera would shoot 48 fps, 360 degree shutter and 3200 ISO for every second frame and ISO 800 for every other frame.

On editing this would be separated to two separate 24 fps videos using every second frame on both. If some scenes where over exposed at 3200 ISO, one could use the ISO 800 for those clips.

If just some areas on few frames where over exposed, Davinci Resolve could provide automated tools to fix them. There would be some calculations needed as the ISO 3200 and 800 pictures are not shot at same time, so it is not super simple, but today with the processing power available should be doable.

The "second track" could be useful also for noice reduction and image stabilisation etc. if the editing SW could take advantage of that.
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Uli Plank

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Re: "Security track" for video, why not?

PostTue Sep 28, 2021 8:07 am

Get a Red. They have been doing this for years. Might even hold a patent.
Don't approach Resolve with your expectations from other NLEs! They are all different.
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Mike Potton

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Re: "Security track" for video, why not?

PostTue Sep 28, 2021 8:56 am

Yep Red has been doing this, even possible with Magic Lantern raw on the 5D, 7D...etc if I recall. It hasn't caught on in a meaningful way,

Dual gain sensors negate the temporal issues and operate on a similar principal. Two separate sensor read out amplifications captured, then combined to reduce noise. Cameras containing dual gain include the C70, Arri Alexa's, Ursa Mini Pro 4.6k...
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Kim Janson

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Re: "Security track" for video, why not?

PostTue Sep 28, 2021 12:59 pm

So what editing SW would support this, or is it recorded as two separate videos already on camera?
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Uli Plank

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Re: "Security track" for video, why not?

PostTue Sep 28, 2021 3:57 pm

DR is fully supporting it. Either with Red's algorithm to combine them or by opening a second input to let you decide, like for masking.
Don't approach Resolve with your expectations from other NLEs! They are all different.
Resolve Studio 17.2.2 and Fusion Studio 17.2.1, macOS 11.5
iMac 2017 Radeon Pro 580 8 GB VRAM, 32 GB, eGFX Breakway RX 580
Mac mini M1, 16 GB RAM
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carlomacchiavello

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"Security track" for video, why not?

PostTue Sep 28, 2021 5:31 pm

Kim Janson wrote:So what editing SW would support this, or is it recorded as two separate videos already on camera?
Every software that support stereo 3d clip, from long time software can manage together or corrected separated two eyes video channel and blend in different way.
One way to have what you ask is shooting with stereo rig with zero disparity and (obviously) dual cam with trilevel sinc to match at pixel data.


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