hdv to dvcpro50
- Thread starter brianluce
- Start date
Spartacus
Veteran
Another point of interest, maybe it is of help:
http://www.dvxuser.com/V6/showthread.php?t=51385
http://www.dvxuser.com/V6/showthread.php?t=51385
Elton
Veteran
Well, I've done this downconversion with H1 stuff, and it was amazing. I compared it to DV downconversion and you could definitely perceive the higher color sampling of DV50. Very rich for SD and extra sharp too. I edit SDX900 footage quite often, and the downconverted H1 image vs. the SD native DV50 from that camera are actually quite comparable, DOF issues aside. I think the JVC would also look excellent in DV50. Those extra pixels with color information add up to good things in SD.
Whether you take a 1440x1080 HDV frame from the H1, or a 1280x720 from the HD100...that's a lot of extra information to cram down the SD pipe.
Try a downconversion in Compressor or MPEG Streamclip and see what I mean.
Whether you take a 1440x1080 HDV frame from the H1, or a 1280x720 from the HD100...that's a lot of extra information to cram down the SD pipe.
Try a downconversion in Compressor or MPEG Streamclip and see what I mean.
stephenlnoe
Well-known member
This PDF is GOLD Click here for Pinnacle PDF. This applies to Liquid but the concept is the same for any NLEbrianluce said:
While I'm at it, here's a white paper on HDV and editing HDV natively Click here for Pinnacle White Paper
Good luck amigo...
Barry_Green
Moderator
The JVC has 640x360 chroma. So if you're downconverting its 1280x720 to 720x480, there's not enough chroma there to do a full 4:2:2...
The Canon has 720x540 chroma recording, so it has enough. The JVC isn't quite enough. DV records chroma at 160x480, so the vertical isn't quite there. Plenty of horizontal to do 4:2:0, but not quite enough vertical to get 4:2:2 out of.
The Canon has 720x540 chroma recording, so it has enough. The JVC isn't quite enough. DV records chroma at 160x480, so the vertical isn't quite there. Plenty of horizontal to do 4:2:0, but not quite enough vertical to get 4:2:2 out of.
Barry_Green
Moderator
No, I'm saying that's what the chroma resolution is.
The XLH1 records 1440x1080, and its recorded chroma resolution is 720x540. So if you downsample HDV to a 720x480 frame, you could retain full chroma resolution (as long as you don't subsequently encode to DV or some other chroma-decimating format).
The JVC doesn't have that high chroma res. It has 640x360. Still a lot, but not enough to do a full frame of SD video with. You'd get better than 4:2:0 on the downres, certainly; but there's not enough chroma information for every scan line (there's only 360 scan lines' worth of chroma in the JVC source image) so you'd get, at best, one chroma sample for every 1.5 scan lines. 4:2:2 and 4:1:1 deliver a chroma sample on every scan line; downrezzed JVC HDV couldn't quite match that, it'd be one sample for every 1.5 scan lines. Don't even know how well that'd work.
But consider that regular DV has chroma res of 180x480 (in NTSC) or 360x240 (in PAL), so the JVC downrezzed would have a whole lot more than DV would. And potentially more horizontally than 4:2:2, but not enough vertically.
The original question was in relation to the Canon, which records 720x540 chroma, which is theoretically enough that one could make 4:4:4 SD from it. You asked if the JVC could as well, and the answer is no, not really, but it'd still probably be pretty good.
The XLH1 records 1440x1080, and its recorded chroma resolution is 720x540. So if you downsample HDV to a 720x480 frame, you could retain full chroma resolution (as long as you don't subsequently encode to DV or some other chroma-decimating format).
The JVC doesn't have that high chroma res. It has 640x360. Still a lot, but not enough to do a full frame of SD video with. You'd get better than 4:2:0 on the downres, certainly; but there's not enough chroma information for every scan line (there's only 360 scan lines' worth of chroma in the JVC source image) so you'd get, at best, one chroma sample for every 1.5 scan lines. 4:2:2 and 4:1:1 deliver a chroma sample on every scan line; downrezzed JVC HDV couldn't quite match that, it'd be one sample for every 1.5 scan lines. Don't even know how well that'd work.
But consider that regular DV has chroma res of 180x480 (in NTSC) or 360x240 (in PAL), so the JVC downrezzed would have a whole lot more than DV would. And potentially more horizontally than 4:2:2, but not enough vertically.
The original question was in relation to the Canon, which records 720x540 chroma, which is theoretically enough that one could make 4:4:4 SD from it. You asked if the JVC could as well, and the answer is no, not really, but it'd still probably be pretty good.