Messages

31

Software Dev / Question about SD card wear.

« on: June 14, 2019, 11:02:37 AM »

Does the OS SD card get written to constantly while the camera is running? I had an SD card fail in a weird way and I'm not sure if its Raspberry Pi syndrome or just a bad card.

For reference it's not the card that came with the camera its a Kingston 8gb which is slightly smaller than the original card. To get the Chronos OS onto the card I had to shrink the ROOTFS partition by a little sometime around v0.2 and I have been updating normally since then.

32

Software Dev / Re: Chronos V0.3.2 Beta

« on: June 10, 2019, 04:27:02 PM »

Awesome, glad I could help!

33

Software Dev / Re: Chronos V0.3.2 Beta

« on: June 08, 2019, 05:39:00 PM »

Ran the camera on an older version and everything looked fine, updated and found the same black calibration issues, so here's what I found.

#0 It only happens at frame rates above ~27kFPS
#1 It gets 10x worse at 4x analog gain, at 1x and 2x the image is pretty good. At 16x I get only gibberish for an image.
#2 The flickering seems to be related, it is most apparent when the vertical banding is present. I haven't measured the period of the flicker yet to see if it is the same at every resolution/fps.

Below I have attached 4 images taken at the 320x96 40420.4fps 20.08us 4x analog gain (worst case scenario but the effect is very similar down to ~27Kfps. I let the camera warm up (it seems to do that a lot faster now, the fan ran at full speed since the update) before taking the images. I had to convert them to PNG because the forum didn't like .TIFF files made by the camera.

0th image is taken before doing a black cal and before doing the factory cal.
1st image is after a black cal but before the factory cal
2nd image is after the factory cal but before doing new black cal
3rd image is after the factory cal and after a black cal

Hopefully this is helpful.

34

Software Dev / Re: Chronos V0.3.2 Beta

« on: June 08, 2019, 01:28:02 PM »

I'm going to restore a known good version then try the update again. If I get the same results I'll make some example files for you.

35

Software Dev / Re: Chronos V0.3.2 Beta

« on: June 08, 2019, 09:17:47 AM »

Update was easy enough and I like the new storage Tab in the utilities.

Black cal at 1x works well but with any more than that I get significantly more banding than 0.3.1 at higher frame-rates. I'll keep poking around to see if anything I do can make it better or worse. I have also noticed that there is some flickering, at higher gain is is more visible but it can be seen at 1x as well.

I also had "No Batt" after the first restart but that has gone away, not really worried about it.

Sorry for all the negative feedback but I am still impressed at the work that is going into the 1.4 and I am glad you guys are still working towards more features!

36

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« on: May 18, 2019, 02:24:25 PM »

The DNG output and white balance fix make it way easier to get clear shots now.

https://imgur.com/lHNb8lC

37

Software Dev / Re: Saved file's owner/group/permissions.

« on: March 18, 2019, 05:55:41 PM »

Awesome! Thank you! I had some serious head-on-keyboard time and never noticed that the x was missing.

38

Software Dev / Saved file's owner/group/permissions.

« on: March 16, 2019, 04:15:18 PM »

I am using ext3 so I can save >4gb files but the permissions made by the camera are pretty wonky. Is there a way (even if it's a one off change I need to make to my own camera) so that I can change the user and group that the files are saved under? I'm reasonably familiar with Linux and don't mind making backups of my OS microSD in case I brick something.

If there is no easy way then no worries.

Thanks for your awesome work!

-Nick

39

Chronos User Discussion / Re: Infinity focusing in the dark

« on: March 15, 2019, 04:17:52 PM »

If you set your Chronos to 30fps you can increase the exposure enough to let you focus. After you set the focus put the framerate back up to what you intend to record.

40

Software Dev / Re: Software Roadmap - 0.3.1, 0.4.x, etc.

« on: March 14, 2019, 10:17:47 AM »

Glad to hear you guys are still plugging along, each update and rc has made the camera more enjoyable to use. Good luck at NAB!

41

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« on: March 03, 2019, 01:26:47 PM »

"Expose to the right" is your friend. In photography this means exposing your subject as bright as possible without blowing out the whites and then darkening it in post processing. It will let you crush the blacks to 0 while keeping detail in your subject. Unfortunately the only way to practically do this with video is with an absurd amount of light >_<

42

Chronos User Discussion / Re: Workflow - Time

« on: February 17, 2019, 07:24:15 AM »

I can't find it now but there is a thread that mentions using an external drive enclosure with an SSD that is powered by the camera. SSDs are pretty light on power requirements, I can't see why you wouldn't be able to use one.

43

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« on: February 15, 2019, 09:05:11 AM »

Very cool, I like the light guards on the mirror and viewfinder.

44

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« on: February 13, 2019, 06:46:35 PM »

A sub-sonic ping pong ball this time, getting ready for a maker fair. Filmed at 20kFPS

https://i.imgur.com/Z6dLawL.mp4

45

Software Dev / Re: Software Roadmap - 0.3.1, 0.4.x, etc.

« on: February 11, 2019, 12:45:35 PM »

Thanks for the update.

I am excited to see hear the HTTP API is coming along, you guys are doing awesome work!