25f to 29.97 or face the phasing issues? at DVinfo.net

Emrys Roberts · April 2nd, 2009, 02:52 PM

Hey Everybody,

I'm looking for some advice. I recently hired a fellow videographer in the UK. He produced some great footage for me of one of our project sites out there. The main reason I decided to use his services was because he had an EX1 with the capabilities to shoot in NTSC. That way we wouldn't have any crazy conversion issues going from PAL back to NTSC for me to edit with.

Sure enough the footage imports perfectly, except one draw back. Because of the different power frequencies between the UK and the US, we now have a flicker or phasing happening in the image whenever he had to shoot inside (basically whenever unnatural lighting occurs).

Does anyone know of a technique I can use to reduce or eliminate this from the footage he gave me?

Also, would it be a better option to just have him shoot 25f rather than 30f? What's a good technique to translate that footage back to NTSC?

Thanks in advance for any help on this :)

Peter Manojlovic · April 2nd, 2009, 09:50 PM

So, you're using an NTSC camera, with an adapter for frequency conversion correct?
The flicker you mention is quite puzzling....
Could it be perhaps that the shutter speed wasn't set to avoid light frequencies?? Sort of like the "Clear Scan" option on my XH A1?
If that's the case, you're going to have to do some serious post work...
I'm surprised the operator didn't catch that on monitor....

Can't help you there, sorry.
Personally, i've always been a fan of slowing down Progressive 25FPS footage to 23.976FPS...
Since my final delivery was usually DVD, i would simply run a simple program called Pulldown.exe, to my video stream, and it would add the flags for proper playback on DVD's...
You just need to slow the audio by 95.904 percent, and voila....

I used to get kicks out of converting beautifully made DVD's from Europe (filmed progressively of course), and converting them over for proper playback in NTSC land..The transfers were stunning...

April 2nd, 2009, 02:52 PM	#1
Emrys Roberts Regular Crew Join Date: Oct 2008 Location: Denver, CO Posts: 78	25f to 29.97 or face the phasing issues? Hey Everybody, I'm looking for some advice. I recently hired a fellow videographer in the UK. He produced some great footage for me of one of our project sites out there. The main reason I decided to use his services was because he had an EX1 with the capabilities to shoot in NTSC. That way we wouldn't have any crazy conversion issues going from PAL back to NTSC for me to edit with. Sure enough the footage imports perfectly, except one draw back. Because of the different power frequencies between the UK and the US, we now have a flicker or phasing happening in the image whenever he had to shoot inside (basically whenever unnatural lighting occurs). Does anyone know of a technique I can use to reduce or eliminate this from the footage he gave me? Also, would it be a better option to just have him shoot 25f rather than 30f? What's a good technique to translate that footage back to NTSC? Thanks in advance for any help on this :) __________________ Website: http://rougheditproductions.com/ Vimeo Profile: http://vimeo.com/roughedit

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April 2nd, 2009, 09:50 PM	#2
Peter Manojlovic Major Player Join Date: Jun 2007 Location: Hamilton Ontario Posts: 769	So, you're using an NTSC camera, with an adapter for frequency conversion correct? The flicker you mention is quite puzzling.... Could it be perhaps that the shutter speed wasn't set to avoid light frequencies?? Sort of like the "Clear Scan" option on my XH A1? If that's the case, you're going to have to do some serious post work... I'm surprised the operator didn't catch that on monitor.... Can't help you there, sorry. Personally, i've always been a fan of slowing down Progressive 25FPS footage to 23.976FPS... Since my final delivery was usually DVD, i would simply run a simple program called Pulldown.exe, to my video stream, and it would add the flags for proper playback on DVD's... You just need to slow the audio by 95.904 percent, and voila.... I used to get kicks out of converting beautifully made DVD's from Europe (filmed progressively of course), and converting them over for proper playback in NTSC land..The transfers were stunning...