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Ripping DVDs - always deinterlace ?

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Rosie Walunas
Ripping DVDs - always deinterlace ?
on Dec 2, 2012 at 6:00:30 pm

Not sure where to post this, but I'm on an FCP project now and using MPEG Streamclip to rip DVDs.

When a DVD is brought into MPEG Streamclip, it is defaulted to Interlace, so usually I uncheck that box, as I have seen other people do the same.

But should the box 'deinterlace' be checked? Is it no enough to uncheck interlace? Isn't deinterlace effecting the image, and should deinterlacing happen in the NLE?

When deinterlace is checked the resulting clip does look like it has squares opposed to interlacing lines, thus looking 'boxy.'

Which would be preferred?

Let's say I'm ripping the DVD and going to a different frame rate, working in a progressive sequence.

Thanks.


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Rafael Amador
Re: Ripping DVDs - always deinterlace ?
on Dec 2, 2012 at 6:12:51 pm

DVDs can have any field order (upper, lower) or being progressive.
Have a look to the Stream Info (Cmd-I) to know what are you dealing with.
In case of being Interlaced, de-interlacing or not is up to you.
If is Progressive, deinterlacing not only will be for nothing, but even will degrade the picture.
rafael

http://www.nagavideo.com


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Rosie Walunas
Re: Ripping DVDs - always deinterlace ?
on Dec 2, 2012 at 6:17:00 pm

Well, wouldn't an interlaced clip in a progressive timeline be a problem for the online editor and/or colorist down the line?

Or would a deinterlaced clip be better or worse to work with?

(I guess this also spans beyond DVDs as archive could come in interlaced and the project might be progressive.)

Thanks.


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Nick Meyers
Re: Ripping DVDs - always deinterlace ?
on Dec 2, 2012 at 8:31:18 pm

not necessarily.
you'd have to ask them

it would be passing the problem onto them,
but then again, they might be the best person to deal with it.
their de-interlacing tools may be better than yours.

when i use MPEG Streamclip the two checked "intrerlace" options are Interlaced Scaling & Reinterlace Chroma

here's what the manual says

Interlaced Scaling
If you are scaling an interlaced file to a different height, you can tell MPEG Streamclip to preserve interlacement and scale each video field separately by checking "Interlaced Scaling". If you don't, interlacement will be lost in the scaled movie, and, worse, you will get many visual artifacts. This setting is now enabled by default; remember to disable it with progressive files.
Interlacement requires a frame height of more than 288 pixels. If the frame height of the source file is up to 288, interlaced scaling will not be enabled. If the frame height you have chosen for the exported movie is up to 288 and you check "Interlaced Scaling", MPEG Streamclip discards the lower field before scaling the picture (i.e. it performs a fast deinterlacing by dropping one field).

Reinterlace Chroma
If you are converting an interlaced MPEG-1/MPEG-2 file, you may wish to "reinterlace" chroma. By checking "Reinterlace Chroma" you can enable a special remapping of 4:2:0 chroma lines so they will be split correctly between the two video fields. This is a very advanced option: only professional users may see the difference in the output movie. This option is enabled by default; disable it when you are sure your file is not interlaced.
This option has no effect if the source stream is not an MPEG-1/MPEG-2 stream.

Deinterlace Video
If you have an interlaced file, you may also want to deinterlace it, usually to convert into a progressive format, get a "film" effect and have a better playback on the computer's display. When you check the option "Deinterlace Video", MPEG Streamclip enables a special motion-adaptive deinterlacer, and it deinterlaces the lower field in the parts that contain motion, and preserves video quality of all parts that do not contain motion; the upper field is left unchanged. This option slows down the conversion.
Please note that if you are changing the height of an interlaced stream (that is, you are telling MPEG Streamclip to perform vertical scaling) then you must enable either "Interlaced Scaling" or "Deinterlace Video" (at your own choice), otherwise you will see bad video artifacts in the converted movie.


nick


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Rafael Amador
Re: Ripping DVDs - always deinterlace ?
on Dec 3, 2012 at 2:42:28 am

As Nick said.
If you wan't to get the best from the DVD, and you don't know how the clips will be used and delivered the final product, transcode it as it is.
rafael

http://www.nagavideo.com


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Chris Tompkins
Re: Ripping DVDs - always deinterlace ?
on Dec 3, 2012 at 3:50:38 pm

If the DVD video IS interlaced, then YES, keep it that way.

Chris Tompkins
Video Atlanta LLC


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