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Slow Mo camera question

DarkEnergy
By DarkEnergy
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I was watching a random slow motion video on youtube. They had recorded 4 seconds of video that took up 96gb. My question is what kind of media can you write to, that goes at 24gb/s? 

 

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It must be the fastest DDR4 then. The fastest is DDR4-3200 that transfers *up to* 25,600mb/s. 

 

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Posted

ram
sort of like how GPU vram can write at several hundred GBps

thats why those cameras can only take a few seconds of video, the ram fills up fast
then it gets stored on an SSD so that you can record again

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It must be the fastest DDR4 then. The fastest is DDR4-3200 that transfers *up to* 25,600mb/s. 

Nvidiamemory.png

 

GDDR5

150+ GigaBYTES per second

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They're constantly writing over their RAM. Which is why you can press record and it records the past second + 3 more. It then saves the RAM to an SSD after recording.

"Physics is like sex: sure, it may give some practical results, but that's not why we do it." Richard Fynman

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Nvidiamemory.png

 

GDDR5

150+ GigaBYTES per second

I completely forgot about VRAM. Imagine if flash drives had VRAM (and ports that supported those speeds)

 

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I completely forgot about VRAM. Imagine if flash drives had VRAM (and ports that supported those speeds)

wouldnt really work, to be that fast the memory needs to be extremely close to the CPU

like it is on the cameras

 

having the memory IN the CPU makes it even faster, as you can see with the L2 cache at 500+GBps

but internal cache is usually very little, hopefully in the future all system memory will be in the CPU and we can get those crazy speed :)

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I completely forgot about VRAM. Imagine if flash drives had VRAM (and ports that supported those speeds)

The ports are the hard thing. Its a similar problem as to why you can't have a CPU riser.

"Physics is like sex: sure, it may give some practical results, but that's not why we do it." Richard Fynman

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It must be the fastest DDR4 then. The fastest is DDR4-3200 that transfers *up to* 25,600mb/s.

That's just single channel, DDR Ram is usually used in a dual channel configuration.
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I was watching a random slow motion video on youtube. They had recorded 4 seconds of video that took up 96gb. My question is what kind of media can you write to, that goes at 24gb/s? 

 

My bet is Cfast2, compact flash or proprietary SSDs.

 

Cfast2 and compact flash are older formats of data storage that have the image processor CPU/data processor on the cards themselves, making them much more expensive but also allows for faster then normal(SD card) storage.

 

SSDs, well we know that...

May the light have your back and your ISO low.

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If you're all talking about a camera like the Phantom Flex super high speed cameras, they use RAM chips for internal storage/buffer as written in their specifications.  Which then gets transferred to a more permanent storage medium such as a SSD or HDD or high capacity memory cards.

 

http://www.visionresearch.com/Products/High-Speed-Cameras/Flex4K

 

 

The price of these cameras can go up to 6 digits.  They are used by the SlowMo Guys on YouTube.

http://petapixel.com/2014/07/07/4k-raw-1000fps-astounding-test-video-shot-phantom-flex4k/

 

https://www.youtube.com/user/theslowmoguys

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Like others have said, it's saved to RAM and then moved to SSD. There is a reason it can only record 4 seconds and at extremely low resolutions. It is not currently possible to record continously at those frame rates.

 

I'm assuming you're talking about this video:

 

In which case the camera is a Phantom V2511, a $150k camera that is capable of a million frames per second in a 128*32 resolution. Its max resolution is 1280*800.

https://www.visionresearch.com/Products/High-Speed-Cameras/v2511

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Cfast2 and compact flash are older formats of data storage that have the image processor on the cards themselves, making them much more expensive but also allows for faster then normal(SD card) storage.

What do you mean by image processor?
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What do you mean by image processor?

 

the chip inside the Cfast/compact flash cards, I just realized it's not the best word choice... let me fix that.

May the light have your back and your ISO low.

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