HVR-V1e Progressive, how does it work? at DVinfo.net

Wayne Morellini · September 12th, 2006, 03:09 AM

Hi

The V1 progressive recording mode, how does it work, and what will we see from the HDMI port, pixel shifted data, 1920, 1440, 4:2:0?

I understand that the progressive mode is split over interlace frames, resulting in the chroma being split up rather than being in a true 4:2:0 two by two pixel block. I understand that the color sample will be spread across every second line:

Will it be?:
Line 1 1st red+Blue sample
Line 2 2nd red+Blue sample
Line 3 1st red+Blue sample
Line 4 2nd red+Blue sample

Or will it be?:
Line 1 1st red sample
Line 2 1st Blue sample
Line 3 1st red sample
Line 4 1st Blue sample

Or, some other odd thing?

Thanks

Thomas Smet · September 12th, 2006, 08:53 AM

This is a really hard concept for me to grasp by just thinking of it. It is also very hard to explain. I keep figuring it out with charts but then when I stop thinking about it for a few weeks I forget all of it. I will try to find some of the links I once used to figure it out.

All I know is that interlaced 4:2:0 = bad, progressive 4:2:0 = good.

If I can remember off the top of my head I think it is like encoding a 1920x540 video at 60p. Each frame would have a chroma of 960x270. When those are interleaved back together by alternating it would bring you back up to 960x540 chroma but clearly not in the same pattern as progressive 960x540. Please do not quote me on this. This is one of the only subjects I keep getting my facts mixed up with. Damn interlaced 4:2:0!

September 12th, 2006, 03:09 AM	#1
Wayne Morellini Inner Circle Join Date: May 2003 Location: Australia Posts: 2,762	HVR-V1e Progressive, how does it work? Hi The V1 progressive recording mode, how does it work, and what will we see from the HDMI port, pixel shifted data, 1920, 1440, 4:2:0? I understand that the progressive mode is split over interlace frames, resulting in the chroma being split up rather than being in a true 4:2:0 two by two pixel block. I understand that the color sample will be spread across every second line: Will it be?: Line 1 1st red+Blue sample Line 2 2nd red+Blue sample Line 3 1st red+Blue sample Line 4 2nd red+Blue sample Or will it be?: Line 1 1st red sample Line 2 1st Blue sample Line 3 1st red sample Line 4 1st Blue sample Or, some other odd thing? Thanks

September 12th, 2006, 08:53 AM	#2
Thomas Smet Trustee Join Date: Mar 2004 Location: Milwaukee, WI Posts: 1,719	This is a really hard concept for me to grasp by just thinking of it. It is also very hard to explain. I keep figuring it out with charts but then when I stop thinking about it for a few weeks I forget all of it. I will try to find some of the links I once used to figure it out. All I know is that interlaced 4:2:0 = bad, progressive 4:2:0 = good. If I can remember off the top of my head I think it is like encoding a 1920x540 video at 60p. Each frame would have a chroma of 960x270. When those are interleaved back together by alternating it would bring you back up to 960x540 chroma but clearly not in the same pattern as progressive 960x540. Please do not quote me on this. This is one of the only subjects I keep getting my facts mixed up with. Damn interlaced 4:2:0!