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Urgent help regarding de-interlacing
Hi,
I have to deliver today a short film I edited from DV pal footage, shot with a PD150\PD170.
I have to send the film on a miniDV pal cassette.
The film will be digitally projected on a large cinema screen, don’t know exactly what brand of projector.I’m previewing the film on a pal tv monitor to check for interlacing problem, through a dv cam connected by firewire (don’t have a proper video card…)
There were some clips that had motion effects and\or stretched durations, that exhibited interlacing artifacts. I right clicked on them and chose “Always Deintelace” and that did the trick.
However, whenever there’s a clip with fast motion in it (not an effect, the actual motion shot on tape) I see the scan lines clearly on the computer monitor. The footage looks fine on the tv monitor.
I know that the computer monitor is progressive and not designed for interlaced footage, but I am unsure if a projector acts more like the tv monitor or like the computer monitor.
I don’t want any unpleasant surprises on opening night !Should I deinterlace the entire film, just in case?
And if so, what would be the best way to preserve the highest quality of the original interlaced footage?Any help would be greatly appreciated,
Jon. -
7 Replies
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I would not de-interlace, because of the resolution loss, and because the projector can very likely handle interlaced material. Additionally, the PD 150/170 record interlaced anyway, so all you have achieved by de-interlacing is halving your resolution.
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I very much agree here. Hopefully they will even have a switcher that can handle the de-interlacing as well.
De-interlacing with software is only necessary if you are going to the web and have lots of motion; The quality and resolution will be affected anyway.
Vince
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Thanks for the feedback, guys.
I did not de-interlace the entire film, as you suggested.I did choose “Always Deinterlace” for all the clips whose duration I stretched below 100%, and removed frame blending for all the clips whose duration I stretched above 100%.
This the only way I could find to remove the interlace jittering these clips exhibited.Am I missing some better way to correct this, without the loss of resolution that occurs with deinterlacing?
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Again, I wouldn’t de-interlace anything, because the projector will very likely handle that task.
Vince
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Hi Vince, thanks again.
I have to insist, though, that most clips whose duration I stretched in Premiere look terrible after I export them to dvd or tape. I don’t think the projector will fix this once the damage is already done.
If deinterlacing these clips is not the way, what else can be done? -
Either do your slomos in AE or use the Twixtor plug-in. PP is rather bad with slomos.
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thanks, harm
I suspected as much, and will take your advice for future projects.
However it is not an option for the current project.
So, is the deinterlacing option that bad?
I’m willing to accept the loss of resolution, if that’s the only problem, as it is still better than having those terrible unwatchable jitters on slo-mo clips….
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