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Messages - BiduleOhm

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1
Chronos User Discussion / Re: frame rate stored in saved video?
« on: February 07, 2019, 03:49:36 PM »
I don't think so but you can easily put it by hand in the file name when you save it.

2
Chronos User Discussion / Re: Workflow - Time
« 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.

3
Chronos User Discussion / Re: Workflow - Time
« on: January 03, 2019, 12:33:56 AM »
I'm pretty sure 3G means 3 Gpbs but don't quote me on that.

After some research however, I'm curious if it's possible to purchase M.2 SSDs (PCIe/NVMe) with sequential write speeds of up to 1,900MB/s that can be adapted to a SATA III interface?

It would be pointless because the speed of M2 comes from the fact the data isn't serialized over SATA, if you add a M2/SATA adapter you've basically made a classic SSD, a very expensive one :)

4
Chronos User Discussion / Re: Workflow - Time
« on: December 25, 2018, 03:03:20 AM »
It should be about 2 GB per second of hi-speed footage: https://www.krontech.ca/uploads/9/3/8/3/93836312/chronos_1.4_datasheet_rev_4.pdf (I assume the size of the RAW file is the same as the one of the RAM buffer).

5
Chronos User Discussion / Re: Workflow - Time
« on: December 23, 2018, 03:22:29 AM »
The problem isn't moving the file from the camera to your computer but rather moving it from the RAM of the camera to your SD card in the camera because once it's done you can remove the SD card and put another one in in a few seconds. The camera also has an eSATA connector but I can't remember if it works with the current software and, if so, if it is faster than the SD card slot, another member can answer that better than me.

The time depends on what length of footage you want to save and in what format. If you want to save 10 sec of footage it'll take 10 times longer than 1 sec, so select only what you're interested instead of saving the whole buffer. Then you have the choice between MP4 and RAW formats, if I remember right the RAW is slower to save (no time needed in encoding of course but it's far bigger than MP4).

6
Software Dev / Re: Chronos V0.3.1 Beta - Updated Oct 15 2018 with beta-9
« on: October 17, 2018, 08:07:04 AM »
Just plug the USB stick in the USB (A) port of the camera (same port as the eSATA port actually), no need for OTG cable or other things.

7
Chronos User Discussion / Re: Moonlit stills, Chronos suitable?
« on: October 17, 2018, 04:35:51 AM »
I was able to open and play it with VLC without any problems.

8
Chronos User Discussion / Re: Moonlit stills, Chronos suitable?
« on: October 17, 2018, 03:57:18 AM »
Wow, mars is pretty decent for a camera who wasn't designed to do this, especially at 500 fps.

9
Chronos User Discussion / Re: Moonlit stills, Chronos suitable?
« on: October 16, 2018, 02:39:21 PM »
Well... with a lot of averaging (like hundred of frames) it's maybe possible.

I guess the thing is as the sensor is very sensitive you don't need the multiple seconds exposure (as your test at 10 fps proves it) so you can do a lot of shoots in a relatively short amount of time and average them to have a better SNR. I'd say to also test at a higher framerate (something like 20 or 30 fps for example) to see if it improves things, or not... (I don't know if the SNR is the same at 10 fps and 30 fps so I guess only a test will answer that).

10
Chronos User Discussion / Re: Let's talk LENSES!
« on: October 14, 2018, 02:27:57 AM »
There's also the ones who don't have any electronics inside (they're called DC iris; the one you posted is called video iris) and the camera do all the job, they have a 4 pins square connector instead of the mini-DIN like connector; 2 for motor and 2 for feedback (and both are coils like in a galvanometer so be careful with what you power it).


11
Chronos User Discussion / Re: Let's talk LENSES!
« on: October 14, 2018, 01:44:52 AM »
This kind of lense usually take a 9-12 V power and the composite video signal. In short they look at the average level of the video signal to know the luminance and open/close the iris. You can see in the photo of the datasheet it's the case here and you even have the color of the wires matched with what they do. So by sending a 0 to about 1 V DC voltage at the video input you should be able to control the lense iris.

I plan to test this when I get this lens (thanks for posting the link BTW ;)) and post a simple schematic if you want to do the same.

12
Software Dev / Re: Chronos V0.3.1 Beta
« on: October 10, 2018, 11:01:40 AM »
Did you format the drive?

If yes, which file system did you chose?

13
Software Dev / Re: Updating the UI: Network / Remote Control Screen
« on: October 03, 2018, 01:09:58 AM »
For SSH, we can restrict logons to the 192.168.x.x subnet. This subnet is not publicly routable, so it isn't accessible from the internet at large.

AFAIK you can route anything to anything.

14
Chronos User Discussion / Re: Cheap SD cards class 10
« on: October 01, 2018, 12:48:35 PM »
Be very careful with (micro) SD cards, there are chinese clones everywhere and they just copy the specs on the website but the card will never meet them...

Personally I only buy good known model/brand from reputed sources and I never had any problems.

15
Software Dev / Re: Updating the UI: Network / Remote Control Screen
« on: September 28, 2018, 04:10:49 AM »
I prefer the v4 because the only difference seems to be the text "Visit the [...] for remote control" which is a bit useless (we all know what to do with an URL) and use interface real estate.

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