Variable Frame Rate

M

menchifus

Active member
Message to RED team:

Would it cost too much to increase the overcranking to more than 60fps? I would use this cam for commercials and sometimes, especially with food shots, we use more than 60fps. Burger buns and noodles just don't bounce as well at faster speeds. Some directors even go so far as 500fps to slow down food.
 
Check out the RED One Recording Matrix on the RED web site (www.red.com). For the commercial work you describe, you could shoot 2k Windowed at 120fps in S35, 35, and S16 lens formats, or shoot 1080p or 720p at 120fps using S16 or B4 mount 2/3" lenses.

Lots of options for overcranking at frame rates higher than 60fps.

Gibby
www.cut4.tv
 
Vfr

Vfr

Why would the VFR option depend on the lens format? How are these two related?

The S35 format requires a RAID. This would skyrocket the price of the cam. Maybe RED could provide upgrades later on. Would this be just a simple software upgrade for more overcranking?

I guess the VFR I'm asking for is way too specialized anyway. Most people will never need more than 120fps in their projects.
 
menchifus said:
Why would the VFR option depend on the lens format? How are these two related?
Click to expand...

2/3" lenses require less data to be transfered, therefore it can be overcranked higher.

Correct?
 
yes it is a bandwidth issue.. when your shooting only the window of the sensor you can ingest much more data through the pipe.. so you can record more frames.
 
That makes sense. So at 2k instead of 4k, the cam can process more data at the same rate.

Now for the other question: Would a simple software upgrade later on increase the data rate of the cam? Or would it have to be a more complicated hardware upgrade?
 
menchifus said:
That makes sense. So at 2k instead of 4k, the cam can process more data at the same rate.

Now for the other question: Would a simple software upgrade later on increase the data rate of the cam? Or would it have to be a more complicated hardware upgrade?
Click to expand...

I guess the bandwidth between the sensor and the dsp is limited to 4k@60. Remember, this is uncompressed RAW data so we're talking about something like 1,5 GBytes/sec. You can't fix this in software, this is a hardware thing.

But I wonder, in 2k window mode you get 1/4 of the 4k data. So you should get 4 times the 4k framerate, which is 4 x 60 = 240 fps, right?
Then why is it limited to 120 fps?
 
I'd assume 2k is 1/2 of 4k data. Unless we're talking about image area. In that case it would be (1/2)squared = 1/4.
 
its actually almost 1/5.

but regardless.. you dont get 5 times the framerate in camera as the bandwidth limitations. Now if your using the same medium to record 4k with as 2k, like the RED-RAID, sure, you theoretically should be able to crank up to 200fps in 2k mode.. but there are some things that aren't linear in the equation so i think we wont know till closer to the day.
 
What is window mode? Plus I don't get how your lens would effect your data rate. There is a big part of this picture I am missing. Someone help.
 
window mode is when the camera only records a 2k window of the sensor.

Since this eases up the bandwidth and processing of the camera, it allows for the camera to record at faster rates.
 
I think variable frame size is the best thing since the dawn of digital cameras.
It really makes shooting easier/faster/in focus in many situations where S35 DoF limits the choises.
 
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