10-bit internal recording

JRJphoto said:
What are the Mbps/bit rate when recording external 4:2:2 10-bit? Is it exactly the same as whatever format I've chosen? Say, FHD All-I @ 200Mbps. Thanks.
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It doesn't work that way. Your choice of internal doesn't affect the output. The output is always uncompressed, so the mbps and format is up to the external recorder. If you are using a ProRes recorder in ProRes 422HQ then the recording will be 880mbps at 10-bit 4:2:2.

The only question is whether it will be 8-bit or 10-bit. If recording internally too, the external output is limited to 8-bit. If recording externally only, you can choose 10-bit.
 
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bpap said:
Barry,

somewhere here in the forum I have read your sentence, that if I want to have the best quality-results in 1920x1080 (FHD), I should use the “Dual Codec recording”. That means recording card 1 in UHD and recording card 2 in FHD at the same time.
My Question: what is the source of the FHD-files? Is it a downconversion from the UHD recordung files inside the DVX and what kind of downconversion?

Thanks, would be very interesting
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It is a rescaled version of the UHD frame. It is the full UHD uncompressed frame, scaled down to FHD, and then recorded as 50mbps 4:2:0.
 
Barry_Green said:
It doesn't work that way. Your choice of i ternal doesn't affect the output. The output is always uncompressex, so the mbps and format is up to the external recorder. If you are using a prores recorder in ProRes 422HQ then the recording will be 880mbps at 10-bit 4:2:2.

The only question is whether it will be 8-bit or 10-bit. If recording internally too, the external output is limited to 8-bit. If recording externally only, you can choose 10-bit.
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Fantastic! That's great news. Thanks so much, Barry.
 
Barry_Green said:
It is a rescaled version of the UHD frame. It is the full UHD uncompressed frame, scaled down to FHD, and then recorded as 50mbps 4:2:0.
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I understand why this would be beneficial but doesn't the standard FHD setting sample at pretty much the maximum resolution for the sensor (5K'ish) and downscale to FHD? Wouldn't this logically be the better choice (apart from the fact you do not have the UHD version too)?

Thanks,

Torsten.
 
TDCat said:
but doesn't the standard FHD setting sample at pretty much the maximum resolution for the sensor (5K'ish) and downscale to FHD?
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No, it doesn't. It uses a technique called "pixel mixing" (along the lines of pixel binning). The results are much faster scan rates and wider field of view, but somewhat lower resolution and increased aliasing.

Wouldn't this logically be the better choice (apart from the fact you do not have the UHD version too)?
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It would be, if that was what is happening, but generally it isn't. The only way you can get it to do what you describe is to use the "Dual Codec" function, and record UHD on one card and FHD on the other. In that case, it does an on-the-fly rescale of the fully-sampled UHD frame and records an exceptionally sharp, clear, crisp HD frame. It's the highest-resolution HD the camera can make. However, the drawbacks are that when you're in dual-codec you can't use the hybrid OIS, you can't use the i.Zoom, and you don't get the wider FOV or faster scan rates that FHD mode normally provides. If you don't need those, and you only need FHD, then it's a great way to get the best-quality FHD while simultaneously having a UHD master "just in case".

When you use the normal FHD mode (the "pixel mixing" mode) you get a wider FOV, faster scan rates for minimized skew/rolling shutter, hybrid OIS, variable frame rates, and i.Zoom. But the results are a little softer (still way sharper than my AF100 or an HPX170/HVX200, but not as sharp as a PX270 for example), with more aliasing in the image.
 
Barry_Green said:
In that case, it does an on-the-fly rescale of the fully-sampled UHD frame and records an exceptionally sharp, clear, crisp HD frame.
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Does this impact the SDI out in anyway? If the camera is set to UHD and the SDI to FHD (I only have a FHD external recorder), do you know whether any of this would come into play? I don't really know enough about how the SDI out processes it's feed to even take a guess.
 
The SDI is always a top-quality resize from the UHD, if outputting UHD or FHD.

When in FHD mode it outputs an uncompressed version of the pixel-mixed FHD scan.
 
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