Noob question

[George Allen]

Ok I searched around a bit before posting this, so any info/advice would be great

The scarlet is said to shoot

3K (3072x1728) RAW up to 120 fps

or Full Frame 1080p RGB up to 30 fps

But generally, I was wondering - how much would high FPS 3k mode reduce the quality of the footage. I take it its a completely different form of compression... but im still stumped. Logic has it that that 120 FPS mode would be utilising a smaller part of the censor; therefor reducing quality. But by how much?

Any info would be great. hell i may have got it completely wrong :nonod:

 

[David Mullen ASC]

If the camera shoots at 3K from 1 to 120 fps, then it's the same sensor size area, same compression rate, it's just a lot more data at 120 fps, which is why it's the upper limit. There's no quality loss.

If the specs said that you had to switch from 3K to 2K, let's say, to get up to 120 fps, then it would probably mean windowing / cropping the 3K sensor to 2K in order to reduce the amount of data per frame in order to handle more frames per second.

Full-frame 1080P RGB limit of 30 fps suggests that the processor is mainly having to deal with the real-time debayering and conversion of 3K RAW to 1080P RGB, so asking it also handle a high frame rate as well is too much.

 

[George Allen]

Ah I see, that's very logical. And I suppose that accounts for the RED formats iv seen popping up in all the major editing programs. heh.

Cheers for the post!

 

[Michael Vera]

If the camera shoots at 3K from 1 to 120 fps, then it's the same sensor size area, same compression rate, it's just a lot more data at 120 fps, which is why it's the upper limit. There's no quality loss.

If the specs said that you had to switch from 3K to 2K, let's say, to get up to 120 fps, then it would probably mean windowing / cropping the 3K sensor to 2K in order to reduce the amount of data per frame in order to handle more frames per second.

Full-frame 1080P RGB limit of 30 fps suggests that the processor is mainly having to deal with the real-time debayering and conversion of 3K RAW to 1080P RGB, so asking it also handle a high frame rate as well is too much.

They need a multi-core CPU :ihih:

Does one really need anything over 30 FPS? I mean isn't the standard for the big stuff 24 fps?

 

[Justin Chin]

Michael, there's a difference between the project setting and the frame rate. Your project might be set at 24fps (23.98) which is the play back rate, and you could shoot at 96 fps so you can have slow motion. I'm sure people do it all the time. I know I do, and I do it in all different sizes and speeds. It's a pain for transcoding though.

 

[Andrew Gentle]

They need a multi-core CPU :ihih:

Does one really need anything over 30 FPS? I mean isn't the standard for the big stuff 24 fps?

60 / 50 would be nice for mixing with TV cameras shooting at 50i or 60i, wouldn't it? You could interlace it in post.

 

[Justin Anderson]

But generally, I was wondering - how much would high FPS 3k mode reduce the quality of the footage. I take it its a completely different form of compression... but im still stumped. Logic has it that that 120 FPS mode would be utilising a smaller part of the censor; therefor reducing quality. But by how much?

Any info would be great. hell i may have got it completely wrong :nonod:

By my estimation, 3k on Scarlet at current REDCODE36 data rates would amount to:
20MB/s at 24fps
101MB/s at 120fps, which I'd think should be perfectly possible for the RAID drives