Chronos > Chronos User Discussion

Software for measuring velocity

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rdemyan:
I don't understand.  If I recorded my footage at 5407 fps and played it back at 60 frames per second is that different than if I had set the Chronos 2.1 to playback at 25 fps.  Isn't the playback rate independently set from the recording rate.  And for what I am trying to do, the only thing that should matter is the recording fps, i.e. in this case 5407 fps.

A different question:  Is there a way to check the accuracy of the fps on the Chronos 2.1?   Thanks.

Nikon1:
It is Very much different.
 Lets assume you Recorded a Sequence of 100 Frames at a Framerate of 5407fps. That would have taken about 0,01849... Seconds Realtime to Record that.
 Now to Play these 100 Frames Back at 60fps would take 1,6666... Seconds.
 To Play the 100 Frames Back at 25fps would take a Full 4 Seconds.
 Meaning, 25fps will seem to be more than twice as slow, but the 60fps Playback will be much more Smooth.
 . 
 A more detailed Explanation regards Playback Framerate can be found here:
 https://forum.krontech.ca/index.php?topic=692.msg4769#msg4769
 Here you also have Gavin explaining basically the Same thing, in even more Detail as a Video with Examples and Stuff:
 https://www.youtube.com/watch?v=71t_MCJ2_XI
 .
 .
 Regards Accuracy, i will link this Thread, which talks about the 1.4, but should be basically the Same for the 2.1 too:
 https://forum.krontech.ca/index.php?topic=552.0
 As far as i understand it, its basically timed after the internal Quartz Clock, but the Single Frames could have some very small amount of Deviation from that, but over Long Term, it should be crazy Stable and Accurate. In short, i would assume, that if for some Reason your needed Timing was anywhere close to as precise as the Chronos Cameras themselves already are, you would probably want to Trigger them Externally anyways with a more Precise Clock (This might be overkill, but you get the Point):
 https://youtu.be/eOti3kKWX-c?t=1174
 For almost anything else, especially most general Purpose Applications, timing and Framerate Accuracy of the Chronos Cameras should be Plenty Precise enough.

rdemyan:
I'm currently testing a free software program named "Tracker".

https://physlets.org/tracker/

It might do the trick, but I wish it had more features.

Solscud007:
I find it helpful to look up the size of my videos/images.  Then I look at the resolution chart. 800x600 sized image means I filmed it at 2873 FPS. Assuming you did not enter a custom frame rate.

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