HDV, Mpeg and Frame rates.... at DVinfo.net

Theodore McNeil · October 28th, 2006, 08:36 PM

I'm a HDV newbie and I'm trying to get my brain wrapped around some of the finer points.

Take JVC's 6 frame GOP: Does the encoder simply take 6 I-frames and compress them into IBBPBB and then move on to the next 6 frames and do the same? Or is the process more complicated than that?

Ken Hodson · October 29th, 2006, 03:10 PM

It works the same as any mpeg2 compression does, just like a standard 15GOP DVD. One I frame for how ever long the GOP is. In this case it would be 6. So in the JVC's case it would repeat that GOP structure 5 times a second.

Theodore McNeil · October 29th, 2006, 05:44 PM

Excellent thanks.

October 28th, 2006, 08:36 PM	#1
Theodore McNeil Major Player Join Date: Sep 2006 Location: Centreville, Maryland Posts: 258	HDV, Mpeg and Frame rates.... I'm a HDV newbie and I'm trying to get my brain wrapped around some of the finer points. Take JVC's 6 frame GOP: Does the encoder simply take 6 I-frames and compress them into IBBPBB and then move on to the next 6 frames and do the same? Or is the process more complicated than that?

October 29th, 2006, 03:10 PM	#2
Ken Hodson Trustee Join Date: Aug 2003 Location: Vancouver BC Canada Posts: 1,315	It works the same as any mpeg2 compression does, just like a standard 15GOP DVD. One I frame for how ever long the GOP is. In this case it would be 6. So in the JVC's case it would repeat that GOP structure 5 times a second. __________________ Damnit Jim, I'm a film maker not a sysytems tech.

October 29th, 2006, 05:44 PM	#3
Theodore McNeil Major Player Join Date: Sep 2006 Location: Centreville, Maryland Posts: 258	Excellent thanks.