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Sony HVR-V1 / HDR-FX7
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Old September 12th, 2006, 04:09 AM   #1
Inner Circle
 
Join Date: May 2003
Location: Australia
Posts: 2,761
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
Wayne Morellini is offline   Reply With Quote
Old September 12th, 2006, 09:53 AM   #2
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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 Please do not quote me on this.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!
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