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Slow Motion Workflow/Useability?

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Joseph McDonald
Slow Motion Workflow/Useability?
on Jul 3, 2014 at 3:57:07 pm

Hi,

This is my first post to a forum. I have just graduated university and have been DoP on several short films, some of which are doing quite well. I have recently been asked to DP a music video and the director wants it all shot at 50FPS, full HD. The only equipment I have access to is the trusty Panny 101E and a BMCC. The BMCC only does 30fps so that is out of the question really.

The 101E only does 50FPS in 1080i. I cannot test it as I will only get it on the day/the day before. My question is basically wether it will be useable as interlaced. I have not shot slow motion since first year on my 550D and I have never filmed interlaced. If I deinterlace it will it lose some quality/become soft?

I apologise if this is in the wrong place, if it is, advice for where to post it would be very much appreciated.

Thanks guys!


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Matthew Sonnenfeld
Re: Slow Motion Workflow/Useability?
on Jul 3, 2014 at 10:13:19 pm

Definitely better to stay progressive. I think that if you make sure that the camera is in Film Cam, then you will be able to have it at 1080p/25 timebase and then you can overcrank to your desired frame rate. I think that the issue is that you are trying to shoot in 1080/50 which would be an interlaced format rather than overcranking in a progressive timebase.

Don't have one here to check but that's my instinct.

Co-President at fourB Productions, Inc.
Blackmagic Cinema Camera, RED Scarlet-X
2011 Macbook Pro 17", 2.3 Ghz Quad Core, 16GB RAM
2008 Mac Pro 2.6 Ghz 8 Core, 10GB RAM
AJA IoXT, Blackmagic Intensity Pro, Blackmagic Mini Monitor
Adobe Production Premium CC, Avid Media Composer 7, Final Cut Pro Studio 3


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Joseph McDonald
Re: Slow Motion Workflow/Useability?
on Jul 4, 2014 at 3:11:41 pm

Thank you, I really appreciate your response.

Please forgive my naïveté but what does over cranking mean? I have looked it up but it's sort of going over my head.

Thanks again!

Joe


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Matthew Sonnenfeld
Re: Slow Motion Workflow/Useability?
on Jul 4, 2014 at 6:00:02 pm

Overcranking is increasing the frame rate relative to the playback time base. So, if you are recording at 25p but overcrank the frame rate to 50 or 100, it will play back those frames in 25p. Therefore it will be slow motion because it plays back slower than it was captured. The higher the over cranked frame rate, the smoother and slower the playback will be. This is because of the playback time base.

Co-President at fourB Productions, Inc.
Blackmagic Cinema Camera, RED Scarlet-X
2011 Macbook Pro 17", 2.3 Ghz Quad Core, 16GB RAM
2008 Mac Pro 2.6 Ghz 8 Core, 10GB RAM
AJA IoXT, Blackmagic Intensity Pro, Blackmagic Mini Monitor
Adobe Production Premium CC, Avid Media Composer 7, Final Cut Pro Studio 3


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Joseph McDonald
Re: Slow Motion Workflow/Useability?
on Jul 5, 2014 at 12:28:24 pm

I'm sorry, I still don't fully understand, how do I over crank the frames? In post? Is that not basically the same as right clicking and changing the speed to 50%, I thought that was a no go as it jitters.

Thank you so much for your time.

Joe


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Matthew Sonnenfeld
Re: Slow Motion Workflow/Useability?
on Jul 7, 2014 at 2:48:10 pm

Sorry for the delayed response.

You overcrank the frames in camera, not in post. This way it is very different than just changing the speed.

You need to use VFR Recording. In 1080/25p mode you are able to record at 12/15/18/20/21/22/23/24/25/26/27/28/30/32/34/37/42/45/48/50 fps

Co-President at fourB Productions, Inc.
Blackmagic Cinema Camera, RED Scarlet-X
2011 Macbook Pro 17", 2.3 Ghz Quad Core, 16GB RAM
2008 Mac Pro 2.6 Ghz 8 Core, 10GB RAM
AJA IoXT, Blackmagic Intensity Pro, Blackmagic Mini Monitor
Adobe Production Premium CC, Avid Media Composer 7, Final Cut Pro Studio 3


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Joseph McDonald
Re: Slow Motion Workflow/Useability?
on Jul 7, 2014 at 5:49:00 pm

You have blown my mind. I get it now.

Thank you so much!

Joe


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Matthew Sonnenfeld
Re: Slow Motion Workflow/Useability?
on Jul 7, 2014 at 10:15:08 pm

Glad I could help! Enjoy!!!

Co-President at fourB Productions, Inc.
Blackmagic Cinema Camera, RED Scarlet-X
2011 Macbook Pro 17", 2.3 Ghz Quad Core, 16GB RAM
2008 Mac Pro 2.6 Ghz 8 Core, 10GB RAM
AJA IoXT, Blackmagic Intensity Pro, Blackmagic Mini Monitor
Adobe Production Premium CC, Avid Media Composer 7, Final Cut Pro Studio 3


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