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FCP Introducing Interlacing in HD sequence… A bug?
FCP appears to, at its own whim, add interlacing to my 1080i HD sequence. It appears to add the interlacing on footage that has a time remap or speed change on it. In order to fix the problem I had to nest the sequence into a new sequence… Refresh the sequence settings by clicking off and on square pixels and then re-rendering. After that the “frame blending” looked accurate and it no longer appeared 3:2 was added to my 23.98 HD sequence when i stepped through it frame by frame. (Just regular blended full frames)
The only way i had to monitor this was through the downconvert from HD to SD on my NTSC broadcast monitor using the Kona 2 card. Not the most ideal way to properly monitor progressive HD for delivery, I know.
But there’s no reason I could see why any 3:2 or interlacing would be added since I’m working soley in an HD sequence… Using source footage that were 23.98 SGI sequences. I know through the downconvert to the NTSC the pulldown would be added. But for delivery I simply exported a QUICKTIME MOVIE with current settings from my HD sequence. And delivered on firewire, which should not have introduced any interlacing. The interlacing was apparent when screening the qucktime on an HD monitor later.
Anyone else have problems with interlaced frames showing up in HD projects?
Editor / Post Supervisor
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7 Replies
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[Ryan Miller] “FCP appears to, at its own whim, add interlacing to my 1080i HD sequence. “
1080i is an interlaced timeline. 1080p would be progressive.
Are you saying that it’s introducing a reverse field order?
Walter Biscardi, Jr.
Creative Genius, Biscardi Creative Media
https://www.biscardicreative.comNow in Production, “The Rough Cut,” https://www.theroughcutmovie.com
“I reject your reality and substitute my own!” – Adam Savage, Mythbusters
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Final Cut Pro HD doesn’t have an option of 1080p sequence or I would use that… Just 1080i, HDTV 720p, HDTV 1080i, DVCPRO HD 720p60, DVCPRO HD 1080i60.
It may be reversing the field order… But the problem I’m having is the fact that it seems to rendering something wrong. Can’t see it on my computer monitor of course, but on an HDTV or NTSC downconvert I see jitter frames that appear to be shifted fields or bad pulldown when stepping through frame by frame that got it kicked back.
Editor / Post Supervisor
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1080i is an upper field first dominance timeline. So ensure that your Fields are set to Upper Field First.
Walter Biscardi, Jr.
Creative Genius, Biscardi Creative Media
https://www.biscardicreative.comNow in Production, “The Rough Cut,” https://www.theroughcutmovie.com
“I reject your reality and substitute my own!” – Adam Savage, Mythbusters
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When I change my sequence settings to HDTV 1080i (16:9) and my Editing timebase to 23.98…. The field dominance option becomes shaded nactive and autmatically set to NONE. This makes sense in that, when setting the frame rate to 23.98 at HD you would be working with 24 frames per second progressive.. thus there wouldn’t be any field dominance? Am I wrong in assuming that? If this isn’t the case, why doesn’t final cut offer the option to set a sequence that’s HDTV 1080p?
Thx,
RyanEditor / Post Supervisor
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[Ryan Miller] “When I change my sequence settings to HDTV 1080i (16:9) and my Editing timebase to 23.98…. The field dominance option becomes shaded nactive and autmatically set to NONE.”
Yep, that’s correct.
Are you outputting a 29.97 DF HDCAM master? When setting the editing timebase to 29.97 in a 1080 HD timeline, then you can choose a field dominance. How are you getting your 24p timeline out to a 29.97 HDCAM? Via a converter or straight through your FCP system?
I’m currently cutting a 720/59.94 series which we pass through a Teranex converter to output to HDCAM 1080i 29.97. I’m not getting any interlacing issues with moving graphics or speed changed videos on the HDCAM master.
Walter Biscardi, Jr.
Creative Genius, Biscardi Creative Media
https://www.biscardicreative.comNow in Production, “The Rough Cut,” https://www.theroughcutmovie.com
“I reject your reality and substitute my own!” – Adam Savage, Mythbusters
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you can disable field rendering by setting Field Domincance to None in the Sequence settings. This won’t deinterlace footage, but will prevent renders to be interlaced.
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[Ryan Miller] Final Cut Pro HD doesn’t have an option of 1080p sequence or I would use that… Just 1080i, HDTV 720p, HDTV 1080i, DVCPRO HD 720p60, DVCPRO HD 1080i60.
first the standard HDcam format in 24 is PSF – which means “progressive segmented frame) so unless you are working in 444 with which does have a true progressive frame rates
YES HDCam 1080 24psf is played back as an “interlaced” formatgary adcock
Studio37
HD and Film Consultation
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