WHats better; Shooting 108060i vs 108030p for Broadcast at 720p60p at DVinfo.net

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Old February 23rd, 2010, 04:15 AM   #1
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WHats better; Shooting 108060i vs 108030p for Broadcast at 720p60p

I am working for a show that will end up broadcasting all of its sports material at 720p. I have recently learned that that means they broadcast at 720p 60p since 60p is the best for motion rendition of sports programing.

That being said we need to shoot certain B-Roll footage of interviews with small AVCHD cameras that only shoot in 1920x1080 in 24p, 30p or 60i.

A producer instructed me to be shooting in 30p but i do not believed this to be the correct way to shoot material for this show. I believe we should be shooting in 60i, even though the end result will be a progressive broadcast. The problem is that the 30p material will not have the smooth motion perception that 60i would have. 30p would not show fast moving objects as well as 60i would. 30p aesthetically would seem wrong for this show as it would be almost a variant of "film like" look. A miss match from the other material in the show being video like. THe majority of the show is shot at 720p6op native. Now since we don't have the option for acquisition at 60p for our B-roll material we should shoot 1080i 60i and render interlaced to progressive to 720p60p for final broadcast. That makes the most sense to me. Anyone care to disagree. Id like to use this posting to prove my point.
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Old February 23rd, 2010, 04:25 AM   #2
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You are correct - a proper post workflow downrezzing the interlaced footage to a 60P stream would deliver better temporal qualities in exchange for a reduction in resolution
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Old February 23rd, 2010, 04:41 AM   #3
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You do have a case if you were shooting fast moving sports, but, it won't make much difference if you're doing mostly static interview shots and B-Roll shots. Additionally, there may be a case to be made to use 30p for example, maybe to avoid combing and interlacing artifacts when mixing with 60p footage.

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Old February 23rd, 2010, 02:46 PM   #4
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I would say that for interviews if the camera will not be moving 1080p30 would end up being sharper once it goes to 702p60.

Since interviews look better at a slower framerate imho, the framerate difference would not be that big of an issue in the final product.

I would do a test doing it both ways and see what you or the producer likes the best.
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Old February 24th, 2010, 04:30 AM   #5
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My opinion - you are correct, but might need more information, since over the last few years terminology has become confused. My guess is they probably intend broadcasting NTSC standard, which is (near enough) 30i framesps, which is actually equivalent to 60p (displaced one ignored horizontal pixel) half resolution fieldsps.
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Old February 24th, 2010, 05:00 PM   #6
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60i is the way to go.
30p will look noticeably different from 60p, that is something we want to avoid in a multicam production.
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Old February 24th, 2010, 05:16 PM   #7
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I re-read your ost and I am sorry, I was thinking you were shooting the interviews to be put in a program that will be 60p.

I now read it like you will be shooting the b-roll for the interviews which means you will be moving the camera.

I then agree, 60i is the best match.
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