60P to 24P; best method? at DVinfo.net

Jed Williamson · January 28th, 2005, 07:31 PM

Hello,

What would be the best way to convert from 60P(progressive) to 24P for a film out?

Thanks in Advance.

Jesse Bekas · January 28th, 2005, 11:52 PM

I'm not sure you can convert it unless you cut out alot of frames every second, or slow it down 2.5 times.

Maybe there would be a way to convert 60p to 60i, and then turn that into 24p.

from Dvfilm.com...
34. Can I use the JVC HD-1 to shoot hi-def and transfer to film?

No. The JVC's 16:9 HDTV (720p30) format is 30 frames/sec progressive-scan and cannot be converted to 24 frames/sec. (Normal interlaced NTSC is 60 fields/sec and is easily converted to 24, but 30P formats have only 30 motion samples per second and no smooth conversion to 24 is possible).

The other modes of the JVC are standard definition and offer no real advantages. Wait for the European version (720p25) if there will be one.

I'm assuming the rule applies to 60p as well.

(but I'm not an expert, so somebody prove me wrong, and help out Jed!)

Aaron Shaw · January 29th, 2005, 09:05 AM

Actually I believe the VariCam shoots 60p and then converts to 24p. It can be done, I'm quite sure. How is a question I do not know the answer to. Sorry!

Jesse Bekas · January 29th, 2005, 10:06 AM

The Varicam can shoot 60p...but it is used for getting better slo-mo shots (i.e. playback at 40% speed still looks perfect), or for sports videography.

For obvious reasons if it always shot in 60p it would not have a filmic motion.

Josh Barker · February 25th, 2005, 12:11 PM

Use AviSynth (script courtesy of scharfis_brain of Doom9 forums)...

function blend(clip i, clip j, float "w")
{w=default(w,0.5)
i.mergechroma(j,w).mergeluma(j,w)}

function convert60pto24p (clip video, int mode)
{
work = video

out = (mode==2) ? interleave(
\selectevery(blend(trim(work, 1, 0), blend(work, trim(work, 2, 0)),0.5), 5, 0),
\selectevery(blend(work, trim(work, 1, 0)), 5, 3)) :

\ (mode==1) ? interleave(
\selectevery(trim(work, 1, 0), 5, 0),
\selectevery(blend(work, trim(work, 1, 0)), 5, 3)) :

\ (mode==0) ? selectevery(work, 5, 1, 4) :

\ (mode==3) ? interleave(
\selectevery(blend(trim(work, 1, 0), blend(work, trim(work, 2, 0)),0.66), 5, 0),
\selectevery(blend(blend(work.duplicateframe(0),work.trim(2,0)),blend(work, work.trim(1, 0)),0.66), 5, 3))

\ : work

assumeframebased(out)
}

AVISource("c:\yourdvfile.avi")
convert60pto24p(2)

January 28th, 2005, 07:31 PM	#1
Jed Williamson Regular Crew Join Date: Dec 2002 Location: Madison, WI Posts: 175	60P to 24P; best method? Hello, What would be the best way to convert from 60P(progressive) to 24P for a film out? Thanks in Advance.

January 28th, 2005, 11:52 PM	#2
Jesse Bekas Major Player Join Date: Mar 2004 Location: Ridgefield Park, New Jersey, USA Posts: 572	I'm not sure you can convert it unless you cut out alot of frames every second, or slow it down 2.5 times. Maybe there would be a way to convert 60p to 60i, and then turn that into 24p. from Dvfilm.com... 34. Can I use the JVC HD-1 to shoot hi-def and transfer to film? No. The JVC's 16:9 HDTV (720p30) format is 30 frames/sec progressive-scan and cannot be converted to 24 frames/sec. (Normal interlaced NTSC is 60 fields/sec and is easily converted to 24, but 30P formats have only 30 motion samples per second and no smooth conversion to 24 is possible). The other modes of the JVC are standard definition and offer no real advantages. Wait for the European version (720p25) if there will be one. I'm assuming the rule applies to 60p as well. (but I'm not an expert, so somebody prove me wrong, and help out Jed!)

January 29th, 2005, 09:05 AM	#3
Aaron Shaw Major Player Join Date: Jul 2004 Posts: 587	Actually I believe the VariCam shoots 60p and then converts to 24p. It can be done, I'm quite sure. How is a question I do not know the answer to. Sorry!

January 29th, 2005, 10:06 AM	#4
Jesse Bekas Major Player Join Date: Mar 2004 Location: Ridgefield Park, New Jersey, USA Posts: 572	The Varicam can shoot 60p...but it is used for getting better slo-mo shots (i.e. playback at 40% speed still looks perfect), or for sports videography. For obvious reasons if it always shot in 60p it would not have a filmic motion.

February 25th, 2005, 12:11 PM	#5
Josh Barker New Boot Join Date: Nov 2004 Posts: 23	Use AviSynth (script courtesy of scharfis_brain of Doom9 forums)... function blend(clip i, clip j, float "w") {w=default(w,0.5) i.mergechroma(j,w).mergeluma(j,w)} function convert60pto24p (clip video, int mode) { work = video out = (mode==2) ? interleave( \selectevery(blend(trim(work, 1, 0), blend(work, trim(work, 2, 0)),0.5), 5, 0), \selectevery(blend(work, trim(work, 1, 0)), 5, 3)) : \ (mode==1) ? interleave( \selectevery(trim(work, 1, 0), 5, 0), \selectevery(blend(work, trim(work, 1, 0)), 5, 3)) : \ (mode==0) ? selectevery(work, 5, 1, 4) : \ (mode==3) ? interleave( \selectevery(blend(trim(work, 1, 0), blend(work, trim(work, 2, 0)),0.66), 5, 0), \selectevery(blend(blend(work.duplicateframe(0),work.trim(2,0)),blend(work, work.trim(1, 0)),0.66), 5, 3)) \ : work assumeframebased(out) } AVISource("c:\yourdvfile.avi") convert60pto24p(2)