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HDX900 1080/24p?
Hey guys,
I received some DVCPRO tapes that were shot on the HDX900 in 1080/24p. Does this camera really record 1080p? I always thought it only records 720p and 1080i, yet the tapes are marked 1080/24p.
Thanks!
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4 Replies
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Sorry, never mind. Just found this (below) which I didn’t find during my first search. Excellent info.
https://forums.creativecow.net/thread/120/859416#859416
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Daniel,
For others who might wonder, the answer is that the camera’s imager is native 720, but has internal “up rez” processing to 1080 so that recording is 1920×1080 (but horizontally down rezzed to 1440). It will nor result in as sharp a picture as woulde be created in a native 1080 camera (like the Panny 3000/3700 or Sony F900/800/700).
JS
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Horizontal stretching is nearly impossible to see. The images are excellent and if you saw the two side-by-side, you’d be hard pressed to tell the image difference. I’ve mixed both images together and depending on who shot it, sometimes the Panny looks better.
Ernie Santella
Santella Productions Inc.
http://www.santellaproductions.com -
In 1080, HDCAM subsamples horizontal resolution to 1440, DVCPRO HD to 1280. The latter is a 3/4 subsample, using rectangular pixels, HDCAM also uses rectanguler pixels. HDCAM runs at 135Mbps, using 7:1 compression, 3:1:1 color space, DVCPRO HD runs at 100Mbps(less at Native frame rate modes), 6.7:1 compression, 4:2:2 color space.
The new XDCAM 4:2:2 format runs at 50Mbps, 4:2:2 color space, Long GOP frame structure, full horizontal sampling with square pixels, 8-bit, like HDCAM and DVCPRO HD.
AVC-Intra 100 runs at 100Mbps(but actually lower for most frame rates since it is a progressive, Native codec), 4:2:2 color space, I-Frame structure, full horizontal sampling with square pixels, 10-bit depth, giving it 4X the quality of 8-bit formats as far as shades of gray.
The native 720P CCD’s found in the HDX900, Varicam 27H, HPX2000 and HPX2700 have a very nice look and I find them to be virtually indistinguishable compared to a full raster CCD chipset, with the advantage of better sensitivity(comparing HPX2700 to HPX3700, as an example). This is live out of the 10-bit HD SDI output, once recorded on DVCPRO HD, it’s really hard to see any difference, or even AVC-Intra 100. To get the most out of a full raster camera, the lens quality has to be excellent, beyond that of most HD ENG zooms.
Jeff Regan
Shooting Star Video
http://www.ssv.com
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