I'm all in favor of eliminating interlace. I was just pointing out that it's more the interlace than the MPEG-2 compression of it. I've seen uncompressed interlaced HD that looks terrible.
At low data rates, there IS an interlace-compression issue, as the EBU pointed out at IBC. There's also a too-much-information issue. They showed that, at low data rates, 720p looked better than 1080p (yes p).
TTFN, Mark dan.grimes@xxxxxxxx wrote:
Mark, I agree that interlaced 1080i29.97 media doesn't look too bad in certain uses. No doubt the work at the Met. Opera House looks good.I've been working with 1080i29.97 for image magnification (remote playback at satellite campuses) using Doremi V1-HD recorders, which use JPEG2000, at rates of 300Mb/s and Christie projectors. The picture is very decent at reasonable distances. The weak link in my case is the poor SNR and native 720 pixels (spatially offset) in the Panasonic AK-HC1500G camera.With broadcast TV, the interlace appears to work fine for dramas where the images are close up. But with fine detail and fast motion such as sports, it certainly doesn't hold up at 19Mb/s. Some movies have detail problems as well.The project I am currently doing is encoded at 6-8 Mb/s and requires the video to be displayed on a computer. Using players such as WMP and QT, the interlaced MPEG-2 video looks terrible on the computer monitor. There are a lot of steps one must take to make interlaced video look good on a typical computer display and not one software perform each step necessary. There are a lot of hurdles to jump to get there.For the big media networks that distribute over cable, sat., OTA, etc. with media destined to dedicated displays that incorporate hardware to handle interlaced media, I suppose interlace works alright. But for internet distribution and displaying media on typical computers, the interlaced media can be more problematic.I guess my point is if interlacing causes so many problems in the media production world that could be simply overcome by staying with progressive media, doesn't it make sense to work towards a production and distribution model that avoids it?Dan Grimes
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