strobing issues with 24p footage at DVinfo.net

Ed Kukla · November 28th, 2011, 06:25 AM

I have some 1080 24p footage with fairly slow pans that still strobe more than I would expect. Are there some settings I should consider to minimize this strobing issue?

I've encoded at low, med & hi bit rates, tried 29.97 (worse) and a few other tricks that didn't help.

Robert Young · November 28th, 2011, 02:54 PM

A slower shutter speed may help.
It's a tradeoff b/t motion blur and stutter.
I think it's really difficult to do 24p shots that involve much camera motion.

Steve Mullen · November 28th, 2011, 03:52 PM

Robert's correct. Inexpensive cameras have too much edge detail and too little fine detail (from low MTF and low resolution). Thus the edges are way too sharp and you see them and thus see the natural edge judder from 24p.

If you dial down Sharpness, you do reduce edges but you also reduce fine detail -- a nasty catch 22.

For more detail, go to DVC and look for the Broadcast Engineering story on 24p.

Ed Kukla · November 28th, 2011, 06:04 PM

I posted this in the Adobe forum to look for post solutions, got any?

Thanks

Steve Mullen · November 28th, 2011, 08:19 PM

Reduce contrast by using gamma because edges are most easily seen when contrast is high. I suppose reducing saturation might help too -- if your edges have bright color.

Bart Walczak · November 29th, 2011, 04:20 AM

Or you can move the footage to a compositing software like Nuke or Fusion and use optical flow/motion blur to create artificial motion blur. Not the cheapest or time-saving solution though.

November 28th, 2011, 06:25 AM	#1
Ed Kukla Major Player Join Date: Mar 2008 Location: All over, USA Posts: 512	strobing issues with 24p footage I have some 1080 24p footage with fairly slow pans that still strobe more than I would expect. Are there some settings I should consider to minimize this strobing issue? I've encoded at low, med & hi bit rates, tried 29.97 (worse) and a few other tricks that didn't help.

November 28th, 2011, 02:54 PM	#2
Robert Young Trustee Join Date: Mar 2005 Location: Coronado Island Posts: 1,472	Re: strobing issues with 24p footage A slower shutter speed may help. It's a tradeoff b/t motion blur and stutter. I think it's really difficult to do 24p shots that involve much camera motion. __________________ Bob

November 28th, 2011, 03:52 PM	#3
Steve Mullen HDV Cinema Join Date: Feb 2003 Location: Las Vegas Posts: 4,007	Re: strobing issues with 24p footage Robert's correct. Inexpensive cameras have too much edge detail and too little fine detail (from low MTF and low resolution). Thus the edges are way too sharp and you see them and thus see the natural edge judder from 24p. If you dial down Sharpness, you do reduce edges but you also reduce fine detail -- a nasty catch 22. For more detail, go to DVC and look for the Broadcast Engineering story on 24p. __________________ Switcher's Quick Guide to the Avid Media Composer >>> http://home.mindspring.com/~d-v-c

November 28th, 2011, 06:04 PM	#4
Ed Kukla Major Player Join Date: Mar 2008 Location: All over, USA Posts: 512	Re: strobing issues with 24p footage I posted this in the Adobe forum to look for post solutions, got any? Thanks

November 28th, 2011, 08:19 PM	#5
Steve Mullen HDV Cinema Join Date: Feb 2003 Location: Las Vegas Posts: 4,007	Re: strobing issues with 24p footage Reduce contrast by using gamma because edges are most easily seen when contrast is high. I suppose reducing saturation might help too -- if your edges have bright color. __________________ Switcher's Quick Guide to the Avid Media Composer >>> http://home.mindspring.com/~d-v-c

November 29th, 2011, 04:20 AM	#6
Bart Walczak Major Player Join Date: Apr 2006 Location: Warsaw/Poland Posts: 716	Re: strobing issues with 24p footage Or you can move the footage to a compositing software like Nuke or Fusion and use optical flow/motion blur to create artificial motion blur. Not the cheapest or time-saving solution though. __________________ Creative Impatience - The Solace of Simple Solutions. A few useful plugins for Adobe users, and my remarks on the tools and the craft in general.