APS Excellence in Physics Education Award
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Science SPORE Prize
November 2011
The Open Source Physics Project is supported by NSF DUE-0442581.
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How to adjust slow motion time stamps
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How to adjust frame time stamp?
- November 15, 2020 at 4:08
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James Linzel
3 Posts
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I'm sorry if the answer to this issue is in another post. I couldn't seem to find any related thread.
In the analysis of a typical ball drop, the frame rate is slow enough that the objects become fuzzy and the uncertainty due to the gap in frames seems to add larger errors than I like.
I would have thought typical movie speeds would be fast enough but maybe there is something I don't understand.
When I upload slow motion videos of a higher frame rate, tracker is assigning time vales according to the length of the clip rather than the frame rate time.
Is this able to be adjusted? I am hoping that increasing the frame rate, with a proper time assgined, will reduce the errors due to the tracking process.
I hope I have been clear about what I am trying to do and hope someone has some method of improving / reducing the time gaps.
Thank you
James Linzel
Shanghai American School
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Re: How to adjust frame time stamp? - November 15 2020 4:40
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James Linzel
3 Posts
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I have found the frame duration on the video tab but it is not editable. Tracker is identifying the frame rate as 30 fps when it should be 240 fps.
Any ideas??
Thanks
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Re: How to adjust frame time stamp? - November 15 2020 1:37
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Douglas Brown
304 Posts
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Hi James, just open the clip settings (5th button on the toolbar) and set the frame rate or frame time there. Doug
> In the analysis of a typical ball drop, the frame
> rate is slow enough that the objects become fuzzy
> and the uncertainty due to the gap in frames seems
> to add larger errors than I like.
>
> When I upload
> slow motion videos of a higher frame rate, tracker
> is assigning time vales according to the length of
> the clip rather than the frame rate time.
>
> Is this
> able to be adjusted? I am hoping that increasing the
> frame rate, with a proper time assgined, will reduce
> the errors due to the tracking process.
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Re: How to adjust frame time stamp? - November 16 2020 6:09
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James Linzel
3 Posts
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Right in front of my eyes.
Thank you. I use it more and more every year with my grade 9 science students.
Keep safe.
James
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