FS7: Shogun inferno downscale 4K DCI?

S

stokstad

Well-known member
Hi!

Im trying to find out if you can take a HDMI 4k DCI and/or UHD signal from the FS7, put it into the shogun inferno and record it as 2K DCI or HD 10bit 4:2:2?
Ive tried looking in manuals and searching but can´t find a clear answer.

Anyone knows?
 
Curious? I must not be understanding you question correctly. Why would you want to do it that way? Not in front of the camera now but from memory when shooting your 4K and or UHD internally you can in the video output menu set the output to be HD on the SDI outputs which is 4:2:2 10-bit. The Shogun Inferno cannot down convert so has to be fed a 2K or HD signal. It only records what it sees.

Chris Young
 
I think the Odyssey 7Q+ may do what you're asking (at least with some cameras), but I don't know the device well enough to comment any further.
 
The reason for this would be to downscale before post and thus getting the same quality but saving space. To shoot 4k on the fs7 is for me mainly about getting a better 2k picture (a bit sharper and grades better). Even better would be downscaling into 10 bit 4:4:4
 
Nope, Inferno can’t do it. Only Odyssey 7Q and 7Q+ can do it and it is called Super Sampling.

I am on the same boat, wish Inferno could do it.
 
stokstad said:
The reason for this would be to downscale before post and thus getting the same quality but saving space. To shoot 4k on the fs7 is for me mainly about getting a better 2k picture (a bit sharper and grades better). Even better would be downscaling into 10 bit 4:4:4
Click to expand...

Okay no 444 but if you shoot 4k and output 2K or HD via SDI on the FS7 that output is hardware super sampled down from the 4K image, although at 422 not 444 as we would all love. Therefore you ARE down scaling before post and getting the benefit of a 4K super-sampled image being output at 2K or HD. A very decent 2K/HD image. Obviously the space storage aspect on the Inferno is going to be determined by your chosen bit rate. The only time the the HD from the FS7 is NOT down sampled from the full 4K sensor is when shooting in Super 16 Center Crop mode. As Sony themselves state on their PXW-FS7 / FS7 II workflow page the HD image is super-sampled from the full sensor:

"Even if you’re not planning on 4K production, the 8.8 megapixels of Sony’s 4K image sensor enable you to shoot super-sampled HD, with detail and image texture that HD sensors cannot see."

https://pro.sony/en_GR/products/handheld-camcorders/broadcast-pxwfs7-pxwfs7m2-workflow

If it's of any interest what is happening in the often overlooked Center Crop mode is as follows: Sony’s Super 16 Crop sensor dimensions are 12.7mm x 6.75mm for 2178 x 1148 which results in a diagonal of 14.5mm, a fair bit larger, 32% larger than the 11mm diagonal of a 1920 HD sensor. 2178 x 1148 gives us total of 2,500,344, a resolution of approximately 2.5K. Based on Sony’s Super 16 figures of 2178 x 1148 the center crop function results in a 2.5K crop. One can then argue the following. After applying a 20% loss in resolution after Debayer/demosaicing, as happens with any Bayer sensor, the image produced is in the order of 2,000,275. Very close to a true HD raster of 2,073,600. I've found the HD center crop to be very useful. Have shot a lot for TV sports using the center crop and the quality matches very well with most three chip 2/3" sensor broadcast cameras.

Chris Young
 
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