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Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


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Old August 28th, 2014, 04:17 PM   #1
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Shutter speed when reinterlacing footage in post

I am shooting video for a customer, who requires the footage in PAL DV (576i) format. As my 60D only records progressive video, I use Fieldskit Reinterlacer in post to make the footage interlaced. I opt to shoot with 50 frames/sec (720p50) to make motion a bit more smoother after reinterlacing. Motion never looks very smooth with 60D and I am ok with it, as I try to avoid quick panning etc. while filming. However, I am not sure which shutter speed to use, 1/50 or 1/100. 1/100 would be the normal choice for 50fps footage, but now that I am reinterlacing the 50p footage to 25i in post, shouldn't I stick with 1/50, which is usual when shooting 25fps?
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Old August 29th, 2014, 03:36 PM   #2
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Re: Shutter speed when reinterlacing footage in post

I think you are fine with 1/50 even when shoot 50P if you want it to match 25i
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Old August 29th, 2014, 06:12 PM   #3
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Re: Shutter speed when reinterlacing footage in post

Fieldskit is supposed to smooth the sometimes apparent stuttery motion of p footage with fast action, if you don't have too much movement you don't need Fieldskit, and I can't see any benefit from it whatsoever if you're shooting 50fps since your editor is putting each frame into a field. For shutter speed, 1/50th has become standard for 25fps, if you're shooting 50 fps to go to 50i, shoot at 1/100th to match 50i at 1/50th.
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Old September 1st, 2014, 04:23 AM   #4
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Re: Shutter speed when reinterlacing footage in post

Thanks a lot for your replies!
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