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Totally screwed up frame rate issue
I’ve got a screwy situation here and was wondering if one of you could help me.
I borrowed a Panasonic HVX200AP P2 camera to use as a second camera to shoot a graduation ceremony.
I set the capture mode to 720p/30pn. The “scene file” dial was set to Cine V (which I didn’t realize), causing it to shoot 24 fps. So somehow I shot 24 fps inside a 30p frame rate. Don’t bother asking me how the hell that’s even possible, but apparently it is.
As a result of this, all the footage is overcranked, so I need to somehow get it back to normal speed at 30 fps.
I don’t even know how to do this, but I’m guessing it won’t look purdy by the time I’m done.Any help would be greatly appreciated.
Dell T76000 Dual 8-core 2.4 GHz
NVIDIA Quadro 2000
NVIDIA Tesla c2075
Adobe Premiere Pro CS6
After Effects CS6
Cinema 4d r12 -
6 Replies
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Have you tried using the Interpret footage command in PPro?
Right click on a clip in PPro, Modify->Interpret Footage and you can enter a new frame rate.
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As Andrew notes, the “Modify>Interpret footage” function is available after right-clicking on the clip in the Project panel.
…not sure how 30pn ends up being 24p though…
TimK,
Director, Consultant
Kolb Productions,Adobe Certified Instructor
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Tim, I’ve never seen it either. The Cine V mode basically overrode the 30p frame rate, causing it to overcrank. I’ve never seen anything like it either, which is why I was so confused. It was almost like a poor man’s overcranking.
Why the camera didn’t prevent this from happening, I do not know.I tried the Interpret Footage option, but it’s saying it’s 30 fps already. I ended up slowing it down to 80%, which puts it at the correct speed. I’m going to export it at that speed and use it that way. Probably not the correct way, but it solves the problem.
Lesson learned, problem solved. Thanks all.
TVS
Dell T76000 Dual 8-core 2.4 GHz
NVIDIA Quadro 2000
NVIDIA Tesla c2075
Adobe Premiere Pro CS6
After Effects CS6
Cinema 4d r12 -
[Todd VanSlyck] “I tried the Interpret Footage option, but it’s saying it’s 30 fps already.”
If it looks overcranked, I’d try to interpret it to 23.976 and if it looks right, it would still play on a 30 fps timeline, though you may have to be a bit judicious about edits…
TimK,
Director, Consultant
Kolb Productions,Adobe Certified Instructor
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Panasonic used a a simple plan to achieve the HVX200’s ability to produce files acceptable for post-processing across the ATSC/NTSC spectrum. First, the imaging is done as a “master raw” file in-camera that is 60p/960:720, which was the best available for the hardware at the time. The sweet spot for capture calculations in that formula is 24PN anamorphic 960:720 DVCProHD. The assumption was that output was easily interlaced, scaled and retimed by both proprietary subroutines and third-party apps to files of accepatable quality for both documentary theatre and broadcast wide-spectrum ATSC deliverables. It worked quite well and still does, especially if the finished show is supposed to to look like film, even projected on a large screen. It’s a good compromise which even allows for varicam-style overcranking for smooth slo-mo. And it did so at a reasonable cost to the user. It’s no longer the very best there is — technology advances…but bang-for-the-buck-wise, it was ingenius. It still is.
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[Michael Krupnick] “First, the imaging is done as a “master raw” file in-camera that is 60p/960:720″
On a tape from a Varicam 27F, yes…everything was contained in a 60p stream. Videotape is constant rate and therefore the datarate is somewhat inflexible…
The HVX 200 had that system available, but nobody who knew what they were doing used it as it’s a 100 Mbit’s data stream for (if you were shooting 23.976) 40 Mbit/s of useful content.
In the HVX200, the “pN” (progressive-Native) modes didn’t write all the redundant frames and if you were shooting 23.976 pN, increasing your P2 card capacity by 2.5X over shooting 23.976p, which would have been embedded in a 60p/100 Mbit/s stream.
At that ,moment, it was a bit of a PR conundrum for Panasonic, who had spent a lot of time and money marketing against HDV with their 100 Mbit/s data rate as the obvious separation factor…40 Mbit/s obviously changes that message, but for those who were calculating the actual running time available on a very expensive P2 card, that message needed to get out.
TimK,
Director, Consultant
Kolb Productions,Adobe Certified Instructor
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