Convert 720p60 to 720p30 with frame dropping? at DVinfo.net

Gints Klimanis · February 22nd, 2009, 05:01 PM

Hi,

What software do you use to convert 720p60 (shutter =1/125) to 720p30 ? I was hoping that Sony Vegas 8c would do the job, but 720p30 video is blurrier, as if the frames were averaged instead of dropped. I've rendered my Sony Project to an MXF file.

Thanks for any help.

Bill Ravens · February 22nd, 2009, 05:15 PM

If your source is 60p, then converting to 30p will, typically, just drop one field from each frame to give you 30p. In effect, you're halving your resolution by dropping one field per frame.

I might suggest setting project properties to interlaced, then exporting to progressive with "blend fields".

Gints Klimanis · February 23rd, 2009, 01:57 AM

Hi Bill, The interlace method you suggested didn't produce a difference. Sami answered this question in another thread:

http://www.dvinfo.net/conf/what-happ...egas-8-0c.html
edit: thread link corrected. Sorry, Bill

BTW, Bill, I really liked your Picture Profiles for the EX1. The colors are excellent, and I've always had outdoor trouble with overexposed light skin. Your profiles keep them in range.

Bill Ravens · February 23rd, 2009, 07:05 AM

thanx, Gints.
BTW, your link just sends me back to this thread. But, I am curious what Samy recommended.
edit: ahh, I found it.

Ola Christoffersson · February 23rd, 2009, 01:42 PM

Quote:

Originally Posted by Bill Ravens

If your source is 60p, then converting to 30p will, typically, just drop one field from each frame to give you 30p. In effect, you're halving your resolution by dropping one field per frame.

I might suggest setting project properties to interlaced, then exporting to progressive with "blend fields".

That would be true if the source material was 60i. However, 60p does not contain any fields - only whole frames. So dropping half of them should not affect the vertical resolution only the temporal resolution.

February 22nd, 2009, 05:01 PM	#1
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	Convert 720p60 to 720p30 with frame dropping? Hi, What software do you use to convert 720p60 (shutter =1/125) to 720p30 ? I was hoping that Sony Vegas 8c would do the job, but 720p30 video is blurrier, as if the frames were averaged instead of dropped. I've rendered my Sony Project to an MXF file. Thanks for any help.

February 23rd, 2009, 01:57 AM	#3
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	Hi Bill, The interlace method you suggested didn't produce a difference. Sami answered this question in another thread: http://www.dvinfo.net/conf/what-happ...egas-8-0c.html edit: thread link corrected. Sorry, Bill BTW, Bill, I really liked your Picture Profiles for the EX1. The colors are excellent, and I've always had outdoor trouble with overexposed light skin. Your profiles keep them in range. Last edited by Gints Klimanis; February 23rd, 2009 at 01:54 PM.

February 22nd, 2009, 05:15 PM	#2
Bill Ravens Join Date: Nov 2001 Location: santa fe, nm Posts: 3,264 Images: 10	If your source is 60p, then converting to 30p will, typically, just drop one field from each frame to give you 30p. In effect, you're halving your resolution by dropping one field per frame. I might suggest setting project properties to interlaced, then exporting to progressive with "blend fields".

February 23rd, 2009, 07:05 AM	#4
Bill Ravens Join Date: Nov 2001 Location: santa fe, nm Posts: 3,264 Images: 10	thanx, Gints. BTW, your link just sends me back to this thread. But, I am curious what Samy recommended. edit: ahh, I found it.