What COMPRESSION RATIO in the Scarlet "matches" RedCode 36 in our Red-One ??

[George D.]

What COMPRESSION RATIO in the Scarlet "matches" RedCode 36 in our Red-One ??

We just got our Scarlet and I'm trying to learn it so there are no mistakes when shooting.

I MUST set it up to match the same settings as our Red-One so the footage from both cameras will "flawlessly" marry together in the final production.

We shoot the Red-One in RedCode 36. Which compression ratio in the Scarlet will match that of RedCode 36 ? How about 8:1 ?

Your help and advise is appreciated.

Thanks.

.

 

[Terry VerHaar]

If I recall, REDCode 36 is actually about 10:1.

 

[Bob Gundu]

8:1 is where you'll probably shoot 95 percent of your work.

 

[Nick Pasquariello]

Redcode 28 is about 12:1. Redcode 36 is about 10:1. Redcode 42 is about 7.5:1.

Some VFX shots should be done at 3:1. Most BIG BUDGET movies are done at 5:1 or 6:1. TV shows and Broadcast TV Commercials are typically 8:1 to 10:1. Web stuff is often 10:1 to 12:1.

All rules of thumb and not hard and fast DO IT THIS WAY kind of stuff. But that's the general conventional wisdom.

 

[Greg McDonald]

Redcode 28 is about 12:1. Redcode 36 is about 10:1. Redcode 42 is about 7.5:1.

Is that right? I remember Redcode 42 being 7.5:1 but I thought I remembered Jared, or someone else saying 36 was 8:1 and 28 was 10:1.

 

[Patrick Grossien]

42 is 7.5:1 all right but 36 is 9:1 (and 28 is 12:1) ... read about it right here:

http://www.red.com/learn/red-101/redcode-file-format

 

[Nick Pasquariello]

Could have sworn I read that 36 was 10:1 just the other day. Damnit. Could probably figure it out if I felt like going the algebra; I'm pretty sure that the 28, 36, and 42 refer to the Mb/s datarate at 4K.

 

[Patrick Grossien]

If you want to challenge it go right ahead. There can always be typos even in tutorials

 

[Nick Pasquariello]

The math works better for 9:1 than it does for 10:1. It's not all neat and tidy though (notice how Red always says that Redcode 42 is "about" 7.5:1). Using the compression ratio is nice because it means the same thing at every resolution. 6:1 means I'm writing one sixth of the data as I would be if I were not compressing at all. AKA I'm writing one sixth of the data I would be if I were shooting the same resolution on a Sony or Arri or Black Magic or Canon . . . .

Redcode 28, 36, and 42 are, again I think, Mb/frame (not MB/frame; small b = bits, large B = bytes) of the data that is being written assuming you are using the full 4K sensor of the original Red One. Not 4096x2160, but 4096x2304. So, if you use a different resolution, the number no longer means anything.

But take all of this with a grain of salt; at the tail end of one of the longest stretches of work I've had in a while, so I'd probably be a bit more on point after a good dose of sleep.

 

[Terry VerHaar]

Nick - I believe REDcode numbers are megaBYTES per second, i.e. RC 42 is writing 42 MB/sec.

 

[Lee Saxon]

MB/sec and Mb/frame work out to very different numbers, so definitely only one of those is correct.

 

[Nick Pasquariello]

Yeah, I thought it was MB/sec, but when I did the math in my sleep-deprived state, Mb/frame seemed closer.