Author Topic: Workflow - Time  (Read 395 times)

BiduleOhm

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Re: Workflow - Time
« Reply #15 on: January 04, 2019, 12:31:48 AM »
Just something I remembered: you can use the segmented memory feature to do multiple records before having to export data to a computer if that's helpful to you. I don't know how well it's supported in the current firmware though.

Martin

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Re: Workflow - Time
« Reply #16 on: January 05, 2019, 10:09:23 AM »
Hmmm.... well... that clarifies the speed issue.  If I need faster turnaround from shot to shot, I'll probably just have to purchase a second camera.

Yes, which would also allow for different angles on the same event, which, in research, is always nice to have.

The SSDs that I already have and use with my current camera set-ups are 240GB Intel SSD 520 Series. I would expect them to work great with whatever the Chronos could throw at them

I agree ;D

Quote from: benp
I'll typically have dedicated staff with redundant stations constantly hot-swapping the media cards and dumping the raw footage to HDDs.

In my experience, highspeed recording will always be something you can hardly automate/optimise for highest efficiency production. Each setup takes some time, much longer than the actual recorded event. But this all sounds like you may have some "playmoney", so, why not rent or buy one and see for yourself, how and if you can intigrate the Chronos into a high efficiency workflow? You'd know best :)

Quote from: benp
In short, I don't know what I don't know about high fps work.  The Chronos, I'm learning, requires a shift in my expectations... and I'm okay with that.

Very hard to answer such a question, I'll try anyway. Some of this you already knew, I'm sure.

It all depends on what your main subjects are and how you want them filmed. Most of the times, for varying subjects, the setup (direction and size of view vs scene, lighting, recordingspeed vs motion, shuttersync) and a few tests will take quite some time. The event is usually very short, so, in the end you'll have only a few hundred or thousand frames to save, which, according to Foobar (thanks for the insights!!) never exceed 230fps or 60Mbytes/sec writespeeds.

With eSata and a fast SSD you'll wait roughly 22-25 seconds for 5000 frames encoded with x264 to finish saving (when using 10k fps recording speed and faster).
RAW writespeeds really depend on framesize/filesize per image but are roughly as fast as x264 on 20k fps record and faster)
The videos duration depends how you divide those 5000 frames on playback, e.g. 60 fps playback speed results in 1 min 23 seconds playback time.
I wouldn't go past that playback speed, since older machines start to have playback issues past that mark, I'd guess.

You'll need "clean lighting", without fluctuations from either the powergrid or pulsed LED drivers, else you'll have pulsating brightness in your scene, depending in severity on your recording speed.
(powergrid pulsing becomes "invisible" again at highest recording speeds, it's still there, you just won't notice it anymore)

Shuttersync is most of the times best as close to the maximum as possible, IF you want to see _every_ bit of detail/spec of dust, which will really put your lighting situation to test :) (You might need bright spotslights for that)
But for general motion analysis, it doesn't have to be. An interesting testing field as well! (Pressure waves from my airpistol muzzle looked best/smoothest with slowest shuttersync, the projectile was just a blur though ;) )

There are tons of videos out there now, filmed with the Chronos, maybe there's already something similar to the projects you have in mind?

Quote from: benp
From reading the forums, I already understand that the RAM can be user upgraded for about 1/3 the cost of purchasing that configuration.  And, the reviews on the standard lens aren't that great. 

There are better lenses out there, yes. I've got a 25mm C-Mount f/0.95 Schneider Xenon and I'm quite happy with it. BUT the most sense to me are those speedbooster adaptors, adapting premium glass from Nikon etc to C-Mount, at least in theory: http://forum.krontech.ca/index.php?topic=123.0
RAM-Size depends heavily on your project aim. In all honesty, for single, very short events recorded, the 8Gb model is perfect :) As BiduleOhm mentioned, there are several recording modes, like segmented, where a bigger RAM would mean more segments before you need to flush to storage.

Quote from: benp
Therefore, downtime is avoided at all costs - including paying more for a system configuration I may never need/use.

Multiple cameras would actually make sense then, I'd think. Also considering repair.

Quote from: benp
There are many adapter options already available for using these lenses (with a crop factor) on the Chronos.

That's how I started as well, but crop factor (iirc 4x) isn't doing you _any_ favours here, since you may have to position your camera too far away AND you'll lose quite some light, the lens normally provides. That's why those speedboosters are a nice idea, I have to check up on that ;)
Best would be a native lens, or premium lenses with very minor crop factor difference + speedbooster.

Quote from: benp
At this point, what I probably need to do is find one of the Chronos cameras to borrow or rent that I can try out ... or see about an in-person demo.

Very yes ;)

All the best
Martin
« Last Edit: January 05, 2019, 07:40:54 PM by Martin »