mysterium high speed?

[Michael Ragen]

I know the limits of the Mysterium are 60fps for 4k and 120 for 2k, but is this limited by the actual sensor architecture or cooling issues?

I've been thinking, what if you had a box that attached to the port for the raw port and flash modules with a large ram buffer and an external redcode encoder as a future accessory. This could allow for us Redcoders to get access to the higher framerates for short shooting bursts until the buffer is full.

I know a guy in town that has been using the Phantom HD and he said at the really high framerates you only get 2 second burst of shooting. For shooting 60p at 4k with a decent sized compact flash raid as the buffer you should be able to get a nice little burst in with an accessory like this.

Alternatively, I think it would be cool If Red built a specialty high speed camera. I know the Phantom 65 can do something like 125fps at 4k, and I'm guessing the reason they had to go with 65mm sized sensor was a heat issue, although I don't know anything about sensor design. If Red built a high speed camera you wouldn't need any audio recording, just a flash-raid buffer and your final recording drive for the RedRaw encoded footage. Being able to shoot 1000fps at 1080p would be fantastic, especially using Redcode instead of uncompressed.

I know Red is very busy, I'm just thinking about the future.

[David Mullen ASC]

I would think it's also a processing speed issue.

[Michael Ragen]

Do you mean processing outside of the Red Raw encoding? Wouldn't an uncompressed data buffer help with that?

[Evin Grant]

Sure, you got one laying around? :)

[Michael Ragen]

I wish. Wouldn't 8-12 8gb cf cards do the job, and then a single 8gb cf for the final Redcode output?

[RobRoySyd]

The Phantom has 512 GB of .... I think it's RAM, which is probably where most of the cost is.

[PaulClements]

I don't see how it can be a processing speed issue, if using the RAW port you can output RAW Uncompressed (Non Redcode) at 328MBps (Or whatever it is) then theoretically speaking you could ouput around 350fps if outputting redcode raw (328/27.5 x 30fps). I would reckon the issue lies more within the sensor and electronic shutter.

[Jon Armstrong]

The problem with all digital imagers is the problem of write speed. The Canon 1D Mk IIn has a frame buffer of some 30 frames after which it has to offload the buffer. This is achieved by using RAM. At 8MB per frame that means that the buffer must then dump 240MB at the end. Even if the record was astoundingly fast 650-1000 MBps then exceeding the write speed will chock the system. The dreaded drop frame.

Jon Armstrong
Adelaide South Australia
http://www.nildesperandum.tv

[Jon Armstrong]

Sorry Paul, right now this can't be done (see I don't use the term impossible).

At 4K, a Camera RAW image is approximately 7-8MB, at 350fps, the output would be about 3GBps. Now allow another 33% for wavelet compression to be applied.

I think that that kind of data rate is a bit much right now however, maybe tomorrow afternoon about 3:55 pm

Jon Armstrong
Adelaide South Australia
http://www.nildesperandum.tv

[John Allardice]

I don't see how it can be a processing speed issue, if using the RAW port you can output RAW Uncompressed (Non Redcode) at 328MBps (Or whatever it is) then theoretically speaking you could ouput around 350fps if outputting redcode raw (328/27.5 x 30fps). I would reckon the issue lies more within the sensor and electronic shutter.

The thing is though, that the RAW uncompressed is not being processed, it's just a straight pipe from sensor to RAW port. ( I know I'm simplifying things hugely here)

Redcode RAW needs to be wavelet encoded to become redcode. THAT'S where the processing bottleneck is, the encoder can only handle so much info per sec.