Problem with QT files at DVinfo.net

Gary Gates · November 12th, 2006, 11:48 PM

Hello everyone. I have a question. I recently batched some mxf files into QT files from HD log. Everything came out fine except for one thing. Whenever the camera pans, it seems like my image is buzzing. I look at some other footage that we shot from a previous job, and it does the same thing. All of this footage was shot with the same camera. Has anyone experienced this? Is there some sort of setting on the camera itself that we are missing?

We thought it may have been HD log, but we imported the files into FCP, and it did the same thing. Any help on this would be greatly appreciated. Thanks.

Eric Peltier · November 13th, 2006, 12:32 AM

what do yo mean by buzzing?
do you mean strobing?
did you shoot 24p ?
if yes, 24p will do that when panning.

Gary Gates · November 13th, 2006, 01:27 AM

Eric,

thank you for your answer. Yes, I did mean strobbing, but I didnt know the technical term, sorry.

Then I guess this goes without saying, but Im fishing for a miracle. There is no way to fix the already shot clips, right?

Sam Jankis · November 13th, 2006, 09:14 AM

Slow down your pan and shoot with a faster shutter.

Gary Gates · November 13th, 2006, 10:42 AM

Thank you both for your help, I really appreciate it.

Now, do any of you know if there is any way to fix this in post?

Mike Schrengohst · November 13th, 2006, 12:05 PM

Try slowing them down...may not be perfect but might salvage the shot?

Eric Peltier · November 13th, 2006, 02:59 PM

Quote:

Originally Posted by Gary Gates

Thank you both for your help, I really appreciate it.

Now, do any of you know if there is any way to fix this in post?

slowing the footage might help a bit but it's not going to fix the strobing. it will just look a bit less strobe like.
you should shoot 30PN instead, it's a good compromise between gettings the 24p look and still being able to do fast pans.
I hope you can salvage some of the shots.
good luck

R Geoff Baker · November 13th, 2006, 06:35 PM

Slow down your pan, yes ... but shooting with a faster shutter speed will _enhance_ the strobe effect. If you shoot any shutter speed that is faster than the frame rate, you end up with a temporal 'gap' between frames ... so the camera pans, the frame is taken, the camera pans, the frame is taken -- you get a strobe effect, by definition.

If you shoot the 'proper' shutter speed, the one that matches your frame rate, your pans will be smooth -- the camera never moves except that the frame is being taken.

Slow down your pans, but don't set a faster shutter speed -- unless you want a strobe effect.

GB

Sam Jankis · November 13th, 2006, 08:39 PM

Quote:

Originally Posted by R Geoff Baker

If you shoot the 'proper' shutter speed, the one that matches your frame rate, your pans will be smooth -- the camera never moves except that the frame is being taken.

That's what I meant.

Gary Gates · November 14th, 2006, 12:04 PM

Thanks for the tips, everyone. We shot 24p for the film-like look, but didnt know it would bring this strobing problem. Shooting at 30PN sounds like something we may have to try. Thanks.

November 12th, 2006, 11:48 PM	#1
Gary Gates New Boot Join Date: Nov 2006 Location: Las Vegas Posts: 6	Problem with QT files Hello everyone. I have a question. I recently batched some mxf files into QT files from HD log. Everything came out fine except for one thing. Whenever the camera pans, it seems like my image is buzzing. I look at some other footage that we shot from a previous job, and it does the same thing. All of this footage was shot with the same camera. Has anyone experienced this? Is there some sort of setting on the camera itself that we are missing? We thought it may have been HD log, but we imported the files into FCP, and it did the same thing. Any help on this would be greatly appreciated. Thanks.

November 13th, 2006, 12:32 AM	#2
Eric Peltier Regular Crew Join Date: Apr 2006 Location: San Francisco/Paris Posts: 121	what do yo mean by buzzing? do you mean strobing? did you shoot 24p ? if yes, 24p will do that when panning. __________________ Sights Sounds Stories www.tinboxtwo.com www.reardenstudios.com

November 13th, 2006, 10:42 AM	#5
Gary Gates New Boot Join Date: Nov 2006 Location: Las Vegas Posts: 6	Thank you Thank you both for your help, I really appreciate it. Now, do any of you know if there is any way to fix this in post?

November 13th, 2006, 12:05 PM	#6
Mike Schrengohst Major Player Join Date: Apr 2006 Location: Dallas, TX Posts: 355	Try slowing them down...may not be perfect but might salvage the shot? __________________ Mike Schrengohst dvd.pro@verizon.net

November 13th, 2006, 01:27 AM	#3
Gary Gates New Boot Join Date: Nov 2006 Location: Las Vegas Posts: 6	Eric, thank you for your answer. Yes, I did mean strobbing, but I didnt know the technical term, sorry. Then I guess this goes without saying, but Im fishing for a miracle. There is no way to fix the already shot clips, right?

November 13th, 2006, 09:14 AM	#4
Sam Jankis Major Player Join Date: Jun 2006 Location: St. Pete, FL Posts: 223	Slow down your pan and shoot with a faster shutter.

November 13th, 2006, 06:35 PM	#8
R Geoff Baker Major Player Join Date: Jan 2005 Location: Ottawa, ON Posts: 471	Slow down your pan, yes ... but shooting with a faster shutter speed will _enhance_ the strobe effect. If you shoot any shutter speed that is faster than the frame rate, you end up with a temporal 'gap' between frames ... so the camera pans, the frame is taken, the camera pans, the frame is taken -- you get a strobe effect, by definition. If you shoot the 'proper' shutter speed, the one that matches your frame rate, your pans will be smooth -- the camera never moves except that the frame is being taken. Slow down your pans, but don't set a faster shutter speed -- unless you want a strobe effect. GB

November 14th, 2006, 12:04 PM	#10
Gary Gates New Boot Join Date: Nov 2006 Location: Las Vegas Posts: 6	Thanks for the tips, everyone. We shot 24p for the film-like look, but didnt know it would bring this strobing problem. Shooting at 30PN sounds like something we may have to try. Thanks.