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When to de-interlace?
I’m shooting PAL 50i SD footage in 16:9 with the XL2. Edit with FCPro 6. I’ve never had a problem before with deinterlacing and have never really thought about it before, but when should I deinterlace?
Tonight, I exported a project from FCPro to the desktop as a FCPro quicktime file, opened the file with quicktime player and went into Movie Properties. I ticked de-interlace and the image looked better. However, I was looking at that on an Apple 23″ cinema display. Will there be a difference when I play it on a TV?
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20 Replies
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You bet it will. All CRT TV’s are interlaced. Test it out on a CRT monitor to see how it looks.
Steve Eisen
Eisen Video Productions
Board of Directors
Chicago Final Cut Pro Users Group -
The DVD just came out of the burner in the macpro. I played it on my 42 inch plasma TV and it looks perfect. No squiggley lines at all. I take it that the DVD will look fine on most if not all TVs? U seem to think that by deinterlacing there should be a visual difference. Can u tell me what I should be looking for? Remember that I only ticked deinterlace when I opened the QuickTime file on my desktop, in movie properties. And that I’m using PAL footage.
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Also can someone explain why people shoot interlaced anyway? Only to deinterlace later on? Should we not all be shooting progressive, including myself, if this is the case?
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Plasma and LCD panels are not interlaced screens, unfortunately for everyone there are still a ton of conventional CRT screens floating around, hence using interlaced footage.
Playing de-interlaced footage on a normal CRT monitor will not yield overly positive results.
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[Eoin Ryan] “Also can someone explain why people shoot interlaced anyway?”
Hi Eoin,
You have a beautiful progressive TV, but 95% of the people in this world (as my self) still have interlaced TV sets.
Interlaced still giving a more smooth picture because you are watching (PAL) 50 picture per seconds instead of the 25 in progressive. If you want to get the same smoothness in progressive you need to shot 50P. You can try that just slowing down tho pictures, one interlaced (50i) the other progressive (25p). The interlaced one will provide a much more pleasant picture.
Film is progressive (24p), but when filmmakers want to get a good slow down they shot with cameras that allows higher fps recording.
As Steve says if you want to see the real thing have to try in an interlaced monitors. When you play in a computer it can be QT or any other player who can be doing the de-interlacing.
Cheers,
rafael -
Eoin has produced a standard definition DVD. It is my understanding that the DVD spec for SD is interlaced, so, there is no such thing as a progressive Standard Definition DVD. In other words, whether you shoot in progressive or interlaced, if it is going to an SD DVD, it will wind up as interlaced. At least, that is what I have been told.
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[Chris Babbitt] “there is no such thing as a progressive Standard Definition DV”
No really. You can make a Progressive DVD and you can play it in a Progressive DVD player which (I guess, I don’t own one) can be watch in Progressive TV.
In the end of the day the difference is that Interlaced footage need to be always read as interlaced and keeping a field order. Progressive footage can be read as Progressive, Upper-first or Lower-first with same visual result.
Cheers,
Rafael -
Just one point, when you check de-interlace in the movie properties window you are not de-interlacing the actual video, you are telling the software player (quicktime) to de-interlace on playback. The quality changes depending on horsepower of machine.
Best,
DrewChaos is the beginning of everything.
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thanks for all the insight. In response to drew directly above, are u basically saying that by ticking deinterlace in movie properties in QuickTime that this has absolutely no effect on the QuickTime file when dropped into iDVD? That would make sense alright as there doesn’t seem to be a difference. However I started ticking higher quality in movie properties recently, clicked save and then burned the DVD. The result seems to be sharper. I must just be seeing things though, as a member of this forum said there would be no difference.
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I have not used iDVD in a while, so I need to run my own test, but this does bring up some interesting questions. The foremost being if check higher quality in the properties file then send it through compressor will it make a difference. Does anyone know conclusively?
Drew
Chaos is the beginning of everything.
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