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Reverse Telecine woes…
OK, this is killing me…
I have a QT file in DV NTSC format at 29.97 that accepts 3:2 pulldown in After Effects with the settings “WSSWW“. Flawless. Down to 23.976. Whole frames throughout.
In Cinema Tools, I cannot FOR THE LIFE OF ME find a Reverse Telecine setting that will correctly get me back to 23.98 using exactly the same source file! I feel like I’ve tried every conceivable option of AB, AA, BC yada yada yada.
If I do this in AE, I have to re-render to either DV again (re-compress), or to lossless (150Gb file)
Can anyone throw some light on this for me? How come it works in AE but not in CT?
Specs:
720 x 480
29.97fps
DV/DVCPRO – NTSC
Duration: 01:35:47:22
Fades in from black…Many, many thanks in advance.
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6 Replies
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[Trevor Gilchrist] “WSSWW”
The BB or B1B2 would be the correct selection.
If both the fields that make up the whole frames are contained in the same TC address Field 1 Field 2 would be the correct setting.
If you are getting field reversal issues try unchecking “Standard upper/lower”Matt
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With Cinema Tools you have to put the playhead on the A frame before you hit the rev telecine button. I hate to say this as it’s not very leaderly, but the Cinema Tools manual is extremely short and very concise on this subject.
Jeremy
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[Jeremy Garchow] “With Cinema Tools you have to put the playhead on the A frame before you hit the rev telecine button.”
I must respectfully disagree with Jeremy. CT can reverse the telecine from any point within a cadence, but it is up to the user to tell CT where in the cadence the first frame of the clip is. Hence the choice of AA, BB, _BC_, _CD_, or DD. I personally have successfully reversed telecines from each of these points in a cadence.
What CT cannot do is reverse advanced pulldowns nor can it reverse broken cadences.
[Jeremy Garchow] “the Cinema Tools manual is extremely short and very concise on this subject.”
I whole heartily agree. The manual is quite obtuse.
Matt
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[Matthew Nelson] “CT can reverse the telecine from any point within a cadence, but it is up to the user to tell CT where in the cadence the first frame of the clip is. Hence the choice of AA, BB, _BC_, _CD_, or DD. I personally have successfully reversed telecines from each of these points in a cadence.”
Got ya. Didn’t know that, just always went to the A frame. I guess, when you think about it, it’s really six of one half dozen of the other with work being put on you or CT. In the end, it’s pretty much the same process. If you don’t have keycodes on your footage, you kind of have to find the A frame manually anyway.
Thanks for sharing that, Matthew.
Jeremy
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[Matthew Nelson] “I must respectfully disagree with Jeremy. CT can reverse the telecine from any point within a cadence, but it is up to the user to tell CT where in the cadence the first frame of the clip is.”
Matt.
that is not a guarantee that is accurate, nor does it mean that CT is always correct in its assumption of cadence. ( and that could create a secondary issue with CT always defaulting to 24 fps rather than to a more acceptable 23.98 )You may have been able to remove pulldown from one source by grabbing any of the redundant frames, but be assured that not all sources will that work on. The Common practice is for the user to set the playhead on the 0 or 5 frame to start the reverse telecine.
And as an FYI
CT can remove advanced pulldown- Adam Wilt has that posted on his web site.
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD -
[gary adcock] “that is not a guarantee that is accurate, nor does it mean that CT is always correct in its assumption of cadence. ( and that could create a secondary issue with CT always defaulting to 24 fps rather than to a more acceptable 23.98 ) “
CT makes no assumptions nor does it guess the cadence like AE. In CT 4.0.1 it simply defaults to field 1-field 2, AA and 23.98. The burden is all on the user to make the right selections in the reverse telecine dialog box. In Trevors case the first frame of the clip was the BB frame according to AE’s guess. So selecting BB or B1B2 would be the correct setting.
Going to the 0 or 5 frame is only necessary if the user makes no changes to the default settings. I can guarantee that if the user knows where they are in an unbroken cadence and selects accordingly they will have no trouble reversing telecine.
[gary adcock] “CT can remove advanced pulldown- Adam Wilt has that posted on his web site. “
Good to know I will check this out.
Matt
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