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Interlaced/Progressive

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Helene Thomassen
Interlaced/Progressive
on Nov 11, 2011 at 5:40:24 am

I am shooting for the first time on a Canon xf100 and I am a bit confused whether to shoot Interlaced 50i or Progressive 25p.

I have already shot some footage at 50i(1920x1080) but have now realized, as I am going to project the footage digitally, that progressive is the better format(?). (I'm also experiencing some horizontal lines in my footage when there is movement of the camera.)

Should I change and shoot 25p? And if so, can I add the footage to the same sequence as the footage shot at 50i? Do I then Deinterlace the 50i footage? Can I do this in Fcp (FCP 7) or do I deinterlace the whole project in Compressor? Appreciate all help and advice!


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Rafael Amador
Re: Interlaced/Progressive
on Nov 11, 2011 at 11:49:27 am

[Helene Thomassen] "I have already shot some footage at 50i(1920x1080) but have now realized, as I am going to project the footage digitally, that progressive is the better format(?)"
if you are going to a web video, working full progressive makes things easier.



[Helene Thomassen] "Should I change and shoot 25p? And if so, can I add the footage to the same sequence as the footage shot at 50i? Do I then Deinterlace the 50i footage? Can I do this in Fcp (FCP 7) or do I deinterlace the whole project in Compressor? Appreciate all help and advice!"
Yes.
Go progressive. You will need to de-interlace the footage already shoot (i50).
You can do it before hand with Compressor, or once in the FC p25 sequence.
Compressor does a better de-interlacing than the default FC filter, but there are third part plugins than makes a better job.
There is also a good free stand alone de-interlacer called Jes De-interlacer.
rafael

http://www.nagavideo.com


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Bret Williams
Re: Interlaced/Progressive
on Nov 11, 2011 at 4:49:13 pm

If that's to much work, you can just edit in an interlaced sequence. You can shoot the remainder progressive or interlaced. Won't make much difference. Simply de-interlace on export to your preferred format.

I prefer the higher temporal data of 50p/60p or 50i/60i, but if you're going to web or digital projection at 25p/30p then that's lost. Unless you want to broadcast at 1080i one day. There's no 1080p broadcast yet, is there? It would really have to be 1080 50/60p broadcast to be backwards compatible with SD interlaced stuff I would think, just like 720p is.


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Helene Thomassen
Re: Interlaced/Progressive
on Nov 11, 2011 at 7:08:07 pm

Thank you for your reply!

[Bret Williams] "f that's to much work, you can just edit in an interlaced sequence. You can shoot the remainder progressive or interlaced. Won't make much difference. Simply de-interlace on export to your preferred format."

Will the result really be the same if I shoot interlaced and then deinterlace on export, or if I shoot progressive and edit progressive?

Another perhaps stupid question. What is the difference between 50p and 25p? 50p as far as I understand has twice as many frames but is smaller in size (1280 x720), how is the image (and movement) experienced differently?


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Patrick Bronte
Re: Interlaced/Progressive
on Feb 26, 2013 at 2:13:00 am

Hey Brett,

I'm looking at a getting a Canon XF100 also: would it be a good idea to shot at 50p at 50mbps just to cover all bases? I'm wanting it as a step up from an HV40 HDV to shooting in "true" HD for Blue Ray initially , so I guess I'm asking is it a good idea to shot at it's highest specs in case the employer decides to use it for something more demanding like broadcast?



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Helene Thomassen
Re: Interlaced/Progressive
on Nov 11, 2011 at 6:55:47 pm

Thanks! Very helpful.
One question, if I export the sequence to compressor in order to deinterlace it and then import it again, will I experience a lot of loss in the quality of the image?


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