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FreeTrack Forum > FreeTrack : English Forum > Support : FreeTrack Software > FPS and Jitter

RSS > FPS and Jitter, Problem.

reynal_sf	#1 29/04/2008 - 01h31 Top
Class : Apprenti Posts : 4 Registered on : 29/04/2008 Off line	Hello guys, and thank you for this great piece of software. I'm having a little problem. I'm getting 30 FPS but really high jitter (20-30). It really affects my movements, the little red lights seem to turn off and on (Like if it's not transmitting the light as it supposed to.) But if I lower my FPS (20) it will eventually get lower jitter (2-5). Any ideas? Thank you.
didja	#2 29/04/2008 - 17h29 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	Hi , I don't really think that your issue is due to jitters. I think there is a problem with the threshold. FreeTrack surely doesn't see your leds well. Try to adjust the threshold. Rémy
reynal_sf	#3 29/04/2008 - 21h32 Top
Class : Apprenti Posts : 4 Registered on : 29/04/2008 Off line	I don't really understand what do you mean by "threshold." I'm kind of new at this. But what I don't really understand is that with high FPS (30) it will get high Jitters (20-30). But with low FPS (20) it will get low Jitters (1-5). Could you please explain about the threshold? I don't understand what that is--or where to fix it? Thank you.
didja	#4 29/04/2008 - 22h05 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	Quotation from the FAQ : What does the 'jitter' measurement mean? Jitter counts the number of frames that deviate more than +/-15% of the average frame rate in a second. It indicates frame rate instability which can potentially cause a reduction in panning smoothness. If the deviation is small FreeTrack, when minimized, may be able to neutralise it, so a high jitter number does not necessarily mean there will be high jitter in the output. You can have high jitters and good tracking accuracy . And this what I mean by "threshold" : Good luck . Rémy
reynal_sf	#5 30/04/2008 - 01h55 Top
Class : Apprenti Posts : 4 Registered on : 29/04/2008 Off line	Okay, it still not helping. Look, I made a short clip to make things clearer for you. Just watch it and read the description. (The part that says Note) http://www.youtube.com/watch?v=40h-2875Zps
Kestrel	#6 30/04/2008 - 02h16 Top
Class : Webmaster (admin) Posts : 780 Registered on : 13/07/2007 Off line	You need to have three green lights at all times with no flickering to red. You've reduced exposure to get 30fps which has reduced the brightness of the points and now they aren't bright enough for reliable tracking. Movement reduces their brightness further so it might be tracking when stationary but not when moving. Reduce threshold Make points brighter Use a weaker visible light filter Remove your webcam's IR filter Support FreeTrack
uscstaylor	#7 15/09/2008 - 22h00 Top
Class : Apprenti Posts : 14 Registered on : 31/08/2008 Off line	Thank you for that video, By setting my threshold tab, I am at 0 in the Jitters.

FreeTrack Forum > FreeTrack : English Forum > Support : FreeTrack Software > FPS and Jitter

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