DOWN SIZING TO 720 x 480 USING CINEFORM HD EXPORT WRONG "AR" at DVinfo.net

Joel Corral · August 11th, 2005, 09:39 PM

everytime i export a 1440 x 1080/30p Cineform File to either 720 x 480 (0.9) 4:3 or 720 x 480 (1.2) 16 x 9 using the Cineform HD export codec the Pixel Aspect Ratio is a bit off. the 4:3 letterbox is a bit to squished and the 16 x 9 is a bit squeezed.

here is a couple of examples of what i mean.

www.digitizedmemories.net/help/letterboxcine.jpg (letter box w/cineform HD Codec 720x480)

www.digitizedmemories.net/help/16.9cine.jpg (16x9 w/cineform HD Codec 720x480)

www.digitizedmemories.net/help/letterdvntsc.jpg (letter box w/ DV(NTSC)Codec 720x480)

www.digitizedmemories.net/help/16dvntsc.jpg (16 x 9 w/ DV(NTSC)Codec 720x480)

the DV(NTSC) frames are correct.

So what do i need to do to keep the correct pixel aspect ratio and still work with the Cineform HD codec as 720 x 480 files? i want to work with that codec because of the 4:2:2 color then i will down convert to dvcpro 50.

joel

David Newman · August 11th, 2005, 11:00 PM

It is only a presentation error in media player. If you set the interpretation rules for the import SD CFHD file (to 0.9 or 1.2 as needed), you will find that the pixel data is correct. CFHD was only designed for HD resolutions, which are spare pixel or 1.33:1, SD modes were not planned for. In the next release we will have support for mediaPlayer using SD. This is already done in house.

Joel Corral · August 11th, 2005, 11:39 PM

nice, i would love to stick with 4:2:2 color for projects that i need to downconvert to dvcpro50 from HDV. that would be a HUGE advantage.

joel

August 11th, 2005, 09:39 PM	#1
Joel Corral Major Player Join Date: Nov 2003 Location: Brea, CA Posts: 356	DOWN SIZING TO 720 x 480 USING CINEFORM HD EXPORT WRONG "AR" everytime i export a 1440 x 1080/30p Cineform File to either 720 x 480 (0.9) 4:3 or 720 x 480 (1.2) 16 x 9 using the Cineform HD export codec the Pixel Aspect Ratio is a bit off. the 4:3 letterbox is a bit to squished and the 16 x 9 is a bit squeezed. here is a couple of examples of what i mean. www.digitizedmemories.net/help/letterboxcine.jpg (letter box w/cineform HD Codec 720x480) www.digitizedmemories.net/help/16.9cine.jpg (16x9 w/cineform HD Codec 720x480) www.digitizedmemories.net/help/letterdvntsc.jpg (letter box w/ DV(NTSC)Codec 720x480) www.digitizedmemories.net/help/16dvntsc.jpg (16 x 9 w/ DV(NTSC)Codec 720x480) the DV(NTSC) frames are correct. So what do i need to do to keep the correct pixel aspect ratio and still work with the Cineform HD codec as 720 x 480 files? i want to work with that codec because of the 4:2:2 color then i will down convert to dvcpro 50. joel

August 11th, 2005, 11:00 PM	#2
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	It is only a presentation error in media player. If you set the interpretation rules for the import SD CFHD file (to 0.9 or 1.2 as needed), you will find that the pixel data is correct. CFHD was only designed for HD resolutions, which are spare pixel or 1.33:1, SD modes were not planned for. In the next release we will have support for mediaPlayer using SD. This is already done in house. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

August 11th, 2005, 11:39 PM	#3
Joel Corral Major Player Join Date: Nov 2003 Location: Brea, CA Posts: 356	nice, i would love to stick with 4:2:2 color for projects that i need to downconvert to dvcpro50 from HDV. that would be a HUGE advantage. joel