cf25 vs interlaced

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princigalli

Well-known member
There has been a lot of talk about difference between the two modes, and I know tests on resolution charts show the interlaced footage to have more resolution (even if I am against extra resolution collected at different moments).

I have posted some frame grams from the same subject filmed in both CF25 and interlaced.

The frames will be there as long as my bandwidth will not suffer.

Hope this is useful to someone.

http://www.smashmyphone.com/hdvtest/
 
Re: cf25 vs interlaced

Excellent point. I was busy extracting frames but didn't look too closely. I think that on a TV screen, I won't see a difference. At 1440x810 on my computer, I don't see a difference, or maybe a small one. I don't have an HDTV monitor, so that I can't tell. Frame extraction, interlaced seems to be a little sharper, but can also cause some problems where image is in movement. As for practical use, at the moment CF25 beats everything else. A few steps less and less rendering time to deinterlace and transcode PAL/NTSC. Still, I need to look at the footage a bit more.
 
Re: cf25 vs interlaced

look at the woman eys , in some way the 25cine looks better
 
Re: cf25 vs interlaced

I agree. If we don't take resolution into consideration, I find that many things look better in Cine25, expecially moving parts.
 
Re: cf25 vs interlaced

Workflow gets so much easier with Cineframe25. I think it's just a pure deinterlacer, and it propably just does field blending. You can try it in Photoshop, there's a deinterlace filter with a field blending option. I think it gives almost the exact same results as Cineframe25. There is a resolution loss, but it can't be lesser than 1440X540 pixels. And in my opinion field blending from 1080 lines back into 1080 lines doesn't look bad at all.

Anyway I'm shooting all my stuff in Cineframe25 for now. I just can't bear the rendering times of adaptively deinterlacing at HD resolution. But, propably if you'd want the most quality, you'd have to go through that process.

One thing that troubles me is deinterlacing MPEG2. Can there be artifacts from the deinterlacer more easily, as there are already MPEG artifacts in the fields? Cineframe25 does it's raw deinterlacing on a clean picture, so it gets rid of all the fields totally. Atleast on the example from the DVFilm page, it looks like their example of their own deinterlacer doesn't get rid of all the interlacing artifacts (the horizontal lines on the waves).

It's nice to shoot and edit deinterlaced. And Princigalli, you're right when you say there would be no wars if humans were not that kind of creatures that come up with the idea of interlaced video! Hopefully Panasonic will get it right...
 
Re: cf25 vs interlaced

thanks satellitebunny. I never thought about the issue of deinterlacing mpeg2 files that already have artifacts in them, but now that you mention it, I would be concerned. And yes, the DVFilm software does not seem to remove all of the interlacing, but then I think there is tweaking to do. MPEG Streamclip does a better job but I don't know at what cost. Besides, it's a free software so I don't know what to expect when it comes to solving problems. Anyway, on the DVFilm page, the example they are presenting is not that clear to me. I also hate interelaced footage because it's a dangerous idea to create resolution by adding lines filmed at different moments, even if it's only a fraction of a second.
 
Re: cf25 vs interlaced

Do any of you guys know how to shoot CF25 in HDV mode and then make a NTSC 24p version?

I saw Barry Green post that HD is HD, that there is no difference between PAL and NTSC. If this is the case then if I shoot in HDV I can downconvert to either PAL or NTSC with out having to go through any conversion, correct?
 
Re: cf25 vs interlaced

HD is not HD. With the Sony HVR-Z1E You can choose to record in 50 or 60 Hz. For PAL You have to take 50, for NTSC 60 Hz.
 
Re: cf25 vs interlaced

HD is neither PAL nor NTSC, it is HD. However, there are different frame rates. The Z1 shoots at 50hz or 60hz, and as Robert said, you'd have an infinitely easier time converting 1080/50i down to PAL than you would converting 1080/60i to PAL, etc.
 
Re: cf25 vs interlaced

I think cineframe 25 is the way to go for those that have it. The progressive image must be easier on the compressor so what you might loose in vertical resoltion might well come back in the quality of the compressed image. And an extra stop of sensitivity rarely hurts on a cam with good ND' and can keep you from popping up the gain in low light.
I say go for it. Owning an NTSC fx1 I'm jealous.
Sam
BTW any word on the quality of the cineframe modes on the z1?
 
Re: cf25 vs interlaced

[quote author=SamEdwards link=board=sony;num=1107463156;start=0#10 date=02/14/05 at 21:10:42]I think cineframe 25 is the way to go for those that have it. The progressive image must be easier on the compressor so what you might loose in vertical resoltion might well come back in the quality of the compressed image. And an extra stop of sensitivity rarely hurts on a cam with good ND' and can keep you from popping up the gain in low light.
I say go for it. Owning an NTSC fx1 I'm jealous.
Sam
BTW any word on the quality of the cineframe modes on the z1?
[/quote]

How is it that you get an extra stop in CF25?
 
Re: cf25 vs interlaced

One thing to remember regarding the Sony HDV cameras, is that no matter which mode you are shooting in, you are always shooting interlaced. This camera does not shoot progressive even in the "cineframe" modes.

We (Abel CineTech/LA) are currently doing some comparison testing with the Z1 cineframe modes. Once we have the tests complete, we will post our findings here. I will say that at this point, we are not completely impressed with the cineframe modes. As far as the straight 60i/50i this camera shoot's some beautiful images. But what you are not seeing with a simple frame grab is the jittery motion issue encountered in the cineframe modes. If you read the text under the frame grabs princigalli posted on his website, you'll notice he does state that the images were never progressive and were deinterlaced to post to the site.
 
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