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Old 03-10-2014, 12:45 PM   #1
DigitalDave
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Default Identifying interlaced and progressive footage.

I have been sent a HD from the US to edit a promo for a show. The US company that filmed and did the initial edits didnt "do it" for the producers so having to send the footage to me, has been been at bit acromonious.

On examination some of the footage is 1280x720 and some is 960x720 a mixture of DVCPro and ProRes.
My very basic question is, am I correct in assuming that this footage is all progressive (given the sizes) as 6.5 properties indicate. I've changed the properties on a couple of clips and frankly am not sure. Ideally I would have liked 1080i. How bad would it be just to edit in a 1080i project? From experience would it take a big quality hit? What is a foolprof way of identifying progressive v interlace?
DD
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Old 03-10-2014, 12:51 PM   #2
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I would use Mediainfo (free) in tree view
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Old 03-10-2014, 01:33 PM   #3
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and....

an external tube monitor - you can see everything!!

Paul :-)
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Old 03-10-2014, 03:48 PM   #4
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Besides all the great advice from previous posters I think you should check with producers why it was shot progressive. It could be for "look" or intended delivery target.
If you edit in Interlaced without asking you may end up doing something unwanted.
Better to make an informed decision on the edit.
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Old 03-10-2014, 05:46 PM   #5
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@ Anton its a step up from Gspot (that two of my clients thought was a Google Map app) but it still doesn't spell it out whether it is progressive.

@ Paul a grade one HD CRT...I wish

@ Steve I have worked for the producers for 10 years. They produce shows al over the world and leave the video side to me (they would not specify anything other than a brief). In the UK I look after the filming and in the US they have two good guys they use for aquisition in various parts of the US and who like me would use 1080i- alas this was a company that someone decided to use in Vegas and didn't tick the boxes. If I start the edit progressive I cannot switch to interlaced so I suspect I am stuffed.

@ more4K will take a look in VDub

Thanks all...intravanous Southern Comfort Drip has kicked in!
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Old 03-10-2014, 07:56 PM   #6
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Hi Dave!

You are probably correct in your assumption it's progressive as i don't know of any cameras shooting 1280x720i. So the more important question to ask might be is it 25p or 50p you should be able to see 25p motion cadence on your external display quite easily and if it is 25p then stick with 25p 1280x720 project for editing and any conversions can be professionally made later. If the footage is 50p then your in a much better place as you have the best of both worlds, I would still edit at the native format resolution 1280x720 50p and remember your DVC Pro footage is just anamorphic so best quality scaling in Edius could be set just in case. Your final mastered program from here can go to interlaced without issue and you can choose how you resize to 1080 either in Edius by dropping you master into a 1080i project with lanczos scaling set to high quality interlaced or other my preferred method is Boris RED or BCC UpRez filter.

HTH
Dave.
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Old 03-10-2014, 08:53 PM   #7
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It's 60p as it was shot by a US crew-maybe that is why it didn't look different when tested in interlace.
I have started the project in native 1280x720 60p - can you explain what you mean by "remember your DVC Pro footage is just anamorphic so best quality scaling in Edius could be set just in case". Where would that be set?
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Old 03-11-2014, 01:29 AM   #8
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Hi Dave!

In the past Edius did a poor job of scaling 1440x1080 in a 1920x1080 project so if the same is true for 960x720 in a 1280x720 project then set the projects scaling to lanczos3 high quality. You will find this in the project settings in 6.5 and 7x.

You should see any issues on the output it will look soft... If so set the scaling to lanczos3 etc and check again.

Best
Dave.
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Old 03-11-2014, 06:22 AM   #9
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Thanks Dave, now I understand. I was in cuckoo land. I have never been aware of any problems using P2 DVC ProHD 1440 in a 1920 project...but I do have an optician's appointment on Thursday. I have changed the setting and will lookout closely for any issues.

Many Thanks

DD
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Old 03-11-2014, 10:26 AM   #10
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With all due respect to all and sundry - Edius and a CRT monitor will absolutely, without doubt, determine the field/frame structure, psf, progressive and field dominance of a media file - period.

I would never rely on a progressive computer monitor/ software to prove anything.

But of course, each to there own.

Paul :-)
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