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Messages - skronstein

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Did you do a black calibration since the last change of either resolution, framerate or exposure time?

Here are the options I know of to help combat parasitic sensitivity:

- increase the shutter angle to help overcome the light from parasitic sensitivity. You can do this by using a higher framerate with the same shutter time. A longer shutter time with the same framerate would also help against parasitic sensitivity, but you need the shutter time to be as short as possible to prevent motion blur, so that won't help here.

- use a strobed light so that the camera only receives light while the shutter is open. Under IO Settings, you can find the Frame Sync Output options, which output 5v over the BNC connector or IO 2 when the shutter is open. This can be used to synchronize lights to the camera's shutter. Since this setup allows the lights to be off while the shutter is closed, the effect of parasitic sensitivity would be greatly reduced.

- use the 1.4 instead. The 1.4 uses the LUX1310 image sensor instead of the LUX2100 image sensor. There is something about the way the LUX1310 is designed that makes the parasitic sensitivity much lower.

When the camera's shutter is "closed" it ignores most, but not all, light. This is due to something called parasitic sensetivity, which is how sensetive the sensor is while it is "closed." The image sensor in the 2.1 is affected by this much more than the one in the 1.4; its parasitic sensetivity is 10-20 times higher than on the 1.4.
The 2.1 was really intended to be used with longer shutter times, as in filmmaking. When very short shutter times are used, the light from parasitic sensetivity can actually become visible, as in your 640x120 picture. That is what causes the blur.

Software Dev / Re: Chronos API Documentation
« on: April 30, 2020, 09:19:47 PM »
Hi I'm using Chronos 1.4 32GB Build: 0.4.0~beta38 in a research project and I'm really satisfied with the API. As I use Matlab to control the whole operation. Now I'm able to start - stop recording, changing parameters and even make black calibration. But I'm still facing some problems:

  • I can't get the available storage in my SD card. I can't get any useful data from externalStorage parameter and this information is not even exist in the web UI (image 1). Although I can find the available size in the camera UI (image 2).
  • Parameter disableRingBuffer which is responsible for not overwriting when the buffer is full and automatically stop recording dose not work when changed to true.
  • Bug: I can start recording while the camera is saving a video. That could lead to unexpected behavior.
  • To fix bug number 3 is there any parameter, that would store the camera status so i can check it before do any operation?

Thank you.

You'll have to switch to the unstable software release to get the size and free space of the storage devices.
The easiest way to switch to the unstable repository is probably to flash an SD card with the latest unstable image. Compressed SD card images can be found here:
A guide on how to flash the card can be found here:

With the latest software on unstable, you should be able to get the capacity and free space of a storage device by sending a GET request for that device.

For the first partition on an SD card, use the URL:
http://<Camera IP address>/cgi-bin/storageInfo?mmcblk1p1

For the first partition on an USB stick, use the URL:
http://<Camera IP address>/cgi-bin/storageInfo?sda1

2. and 3.
Thanks, I've reported these bugs. The Unstable release will receive fixes before the Voyager (stable) release does.

You can check videoState here to see if the camera is currently saving:

Software Dev / Re: Chronos V0.4.0 Beta - Debian and Networking
« on: April 29, 2020, 12:30:33 PM »
Trying to find if I have the latest stable build installed - but can't see the matching between the downloadable images (e.g. chronos-voyager-20200410.img.xz) and the build number displayed in the About screen (0.4.0-beta38), nor anything in the List Packages screen, nor in tags in Github. What's the trick? Thanks.
To check if you have the latest package, you have to tap Apply Software Update to start the software update tool, then tap Check for Updates in the tool. The button will be greyed out if there is no internet connection. If it finds any updates, it will ask you if you want to download and apply them.

beta38 is just the build of camApp, which is only the GUI.

Chronos User Discussion / Re: transfer video to computer via code
« on: April 20, 2020, 03:47:04 PM »
Interesting thing, only the reviews are not very good, but you can find something similar. Then it remains to ask the krontech team to make an application for us through which we could manage and watch, it would be much more convenient than going through the browser and entering an IP. Is it possible to make such an app for android and ios?

No, we won't be making an phone app. There isn't really anything that would be functionally different from the webpage that you get from going to the IP address in a browser.
The webpage is already responsive to the narrow screens of phones and tablets, so it is already usable on a phone or tablet.
If you want to be able to get to the web page more quickly, you can add a shortcut to it directly on your home screen, at least on Android.

Chronos User Discussion / Re: External battery for continuous power
« on: April 15, 2020, 09:06:54 PM »
Ahh, Cool, yeah that wouldn't really work for my application.  I need small and light.  I am having a custom water housing build.  The laptop battery works quite well if you are shooting from a tripod.  I shoot with the internal and external batteries together. If I need to disconnect the laptop battery the camera just switches over to internal battery, power uninterrupted.

Did you know about this housing?  It's compatible with the 2.1.
Is there not enough room for the external battery inside this housing?

If you can hook up the camera to a network via ethernet, or directly to a computer via the mini-USB or micro-USB port, you can also start and stop recording using a web UI, as shown in this tutorial:

Software Dev / Re: Chronos V0.3.2 full release
« on: April 14, 2020, 04:07:44 PM »
Could you update the link in this thread for Patch 2?  I installed the update and found I lost the Zebra function and had to go digging to find a post for patch 2 that fixed it. It would make it easier for others looking for the latest update.
Thank you! I've updated the link now.

Software Dev / Re: Chronos V0.4.0 Beta - Debian and Networking
« on: April 14, 2020, 04:04:36 PM »
I'm sorry, I've gotten lost in this thread. Can someone clear this up for me? Is there a new update to the 1.4 and/or 2.1 that is stable? I have one of both but i'm hesitant to try to change anything on them as we are in the middle of things that are difficult to set up/tear down. The last time I was able to simply plug the camera in with an ethernet cable and download the update. Is this different now?
Thank you,

To our knowledge, the current release is stable. For any camera already running a version 0.4 beta or newer, connect an ethernet cable and download the latest update on camera. Alternatively, you can get SD card images here:
Use a 'voyager' file to get the stable software.
The 'unstable' files are only for if those who want the latest software that has received less testing.

A Chronos 1.4 be updated to 0.4. See the first post in this thread for how to update to this software.
All Chronos 2.1 cameras ship with a beta of 0.4, so they can update from the network right from the start.

Chronos User Discussion / Re: Introducing Chronos 2.1 HD!
« on: April 09, 2020, 05:41:50 PM »
Tell me what affects the frequency of RAM and whether it can be replaced, for example, 1600 to 2400 or 2666. What does RAM installation from different manufacturers affect?

We use 1600mhz RAM in the Chronos 1.4 and 2.1, but only run it at 1333mhz.
Faster memory will not affect anything, including maximum framerate.
It can be replaced. Upgrading to more memory will only increase maximum record length up to 32GB.
A 24GB configuration (an 8gb stick + a 16gb stick) should work. We had a 1.4 in the office that worked with that configuration.
The cameras use DDR3, but you linked to some DDR4, which won't be compatible.
If you upgrade, make sure you get regular memory not ECC memory.
If you need to return the camera for repair under warranty in the future, install the original RAM stick(s) that the camera was shipped with.

Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: April 09, 2020, 01:59:43 PM »
Unfortunately, we have decided to remove the 100kpfs feature because of the artifacts at high framerates (around 50kpfs or higher). Starting in the next update, it will no longer be available for the 1.4 or 2.1. The max framerate will be back to 40kpfs for the Chronos 1.4, and 24kpfs for the Chronos 2.1.

Software Dev / Re: Chronos V0.4.0 Beta - Debian and Networking
« on: April 07, 2020, 02:14:29 PM »
Stupid question: Can you keep various versions each on their own uSD card and just swap them around? For example to use the 40k FPS mode in version V0.3.2 then swap the card for V0.4.0 to try the various new features?
If you upgrade to 0.4, then go back to an older version, you might not see the battery's status when using that older version, but it should work fine otherwise. It should work again once you return to 0.4.

Chronos User Discussion / Re: transfer video to computer via code
« on: April 07, 2020, 02:04:34 PM »
Is it possible to control the camera from your phone using this adapter?
As LimaKilo said, the main thing is getting your phone to work with the adapter.
If your phone's browser can connect to the camera, and the browser supports Javascript (I think every modern browser would), then it should work.

Software Dev / Re: Chronos V0.4.0 Beta - Debian and Networking
« on: March 20, 2020, 08:32:29 PM »
It seems pretty quick. On the playback previous recordings section I never see any recordings and the %used is wonky but that doesn't break functionality by any means.

Do you have a readme for the network menu on the new UI? First thing it did was ask me to set a pw without saying what it was for. Will it change the root pw used for ssh?

I haven't used the new UI in a while, but I think the new UI's network menu won't let you use it at all until you set a password on it. I believe it sets the root password for ssh for both the USB and ethernet connections.

There are 2 buttons beside the text box on the App & Internet access screen. Either enter your own password, or tap the button with the dice on it to generate a random password. The network accessible features should be displayed once you have a password and tap the button with the diagonal lines.

Use the attached instructions to set up an SMB share on a Windows 10 system, or an NFS share on a Linux system.
These instructions will also be in the next revision of the user manual.

Thank you for the release V0.4.0 Beta.

I had installed and run chronos-voyager-20200302.img for my chronos 1.4 32GB. The new UI is easy to use but i think some features isn't finished yet and it is less responsive than the old UI. I asked if you can share the instruction for network saving form the new UI, because i think the file you share is not fro the new UI.
NFS and SMB shares have only been implemented in the old UI, not the new one.

  • If I press (Menu -> Camera settings) and then choose save camera settings, i have to force the camera to shut down as it not responding any more.
  • Some time when you go to play & save tab, you can't see the videos that you had recorded. The green bar in the bottom area is sometimes missing when you move forward and backward.
  • (Menu -> Review saved Videos) this tab is really helpful but if you saved many videos and go there to check them you will find no videos in "Files o Device"

Sorry, I was not able to reproduce the freeze after saving settings. My camera pauses for 5-10 seconds while saving the settings to the USB stick, and is then responsive again.

Play & Save is only for viewing and saving the current video in memory, not the viewing of previously saved videos.

Many features have not been completed at this time, including the viewing of previously saved videos..

I have also another question, is saving through Ethernet cable will skip saving to the ring buffer or it just another way for saving videos like saving on SD-card or external Hard disk?

In the current software, videos must be recorded to the ring buffer, before being written to the SD card. In the future, we will support a Continuous recording mode that will allow recording continuously at 60fps on the Chronos 1.4, skipping the ring buffer and saving directly to the SD card.

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