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Rendering problem with overcranked footage converted through DVC Pro HD Frame Rate Converter
Hi all-
I have failed to find any information regarding this specific problem an associate of mine is having. I am getting this information second hand but will try to explain thoroughly.
The project is being done at DVC Pro HD 23.98. There was some footage shot at 59.94 with intention of being used as slow motion in a 23.98 sequence. The footage was loaded at 59.94 and then converted using the DVC Pro Frame Rate Converter. All selection boxes were checked.
The resulting footage seemed to work flawlessly until something that required rendering was done to the clip. Whether it be adding a dissolve or a title. If it requires rendering, the render will cause the footage within the render area to actually play the wrong frames of the original source footage. It plays a variable number of frames earlier than the timecode says it’s playing. Sometimes its playing 5 frames earlier in the clip other times its 14 frames
Tech:
Power Mac G5 2gb ram
OS 10.4.8
FCP 5.1.3
QT 7.1.3
Aja Kona 3Thanks in advance for any information,
Joe Krings, Editor
Refinery
16 West 46th Street, 12th Floor
New York, New York 10036212.391.8166
joseph@refinerynyc.com -
7 Replies
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Hmmm…I generally don’t check the top option, REMOVE DUPLICATE FRAMES, as there are none to remove. But, that can’t be it.
I have not seen this behavior myself. Try trashing all your render files and rendering again. If that doesn’t solve it, download and run FCP Rescue to trash your preferences. This clears up a lot of odd behaviour.
Shane
Littlefrog Post
http://www.lfhd.net -
Thanks Shane. We have trashed the preferences to no avail and have now also tried to reconvert the footag with the top box unchecked also to no avail. The problem seems to mutate over time giving differing results on different renders. I guess perhaps the Frame Converter itself could be making corrupt files but it seems more likely it is something within Final Cut and the way it is rendering these files. I’ll let you know if I figure anything out.
Joe Krings
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Have you used the Frame rate converter from the FCP install disks? Do not use the one that’s on the internet.
If you are making self contained movies, I cannot see how this is happening or even possible. You have made new media @ 23.98. There’s no way you should be able to see extra frames.
Jeremy
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—-Have you used the Frame rate converter from the FCP install disks? Do not use the one that’s on the internet.
—-If you are making self contained movies, I cannot see how this is happening or even possible. You have made new media @ —-23.98. There’s no way you should be able to see extra frames.
I don’t believe it is seeing extra frames, it is just playing a few frames earlier than it should so that when it comes out of the render there is a jump cut forward in time. When you say frame rate converter from the FCP discs do you mean Cinema Tools? I don’t believe this will create the slowdown that we need. As far as I know Panasonic’s plug-in is the “correct” tool to use for this purpose.
Thanks,
Joe Krings
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[Joseph Krings] “. When you say frame rate converter from the FCP discs do you mean Cinema Tools?”
Nope, I mean the Panasonic Frame Rate Converter that comes on the FCP 5.1 install disks. The one on Panasonic’s site is a non universal binary (unless it’s been updated recently). Use the one off of the FCP 5.1 (universal version) and see what that does.
Jeremy
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I have confirmed that the Frame Converter used is the plug in that is on the install disc.
Other new information is that it occurs on two specific converted clips, not all.
It occurs on the same clips when reconverted on different machines multiple times.
The probelm only occurs later in the clips and these clips are 20 plus minutes long.It sounds to me as if there is some drift in the original metadata that is maintained in the conversion that causes final cut pro to access the wrong frames when rendering. This is why it never changes even when reconverted multiple times on multiple machines. Unfortunately I cannot recapture with smaller loads as I do not have the deck any longer.
Joe Krings, Editor
Refinery
16 West 46th Street, 12th Floor
New York, New York 10036212.391.8166
joseph@refinerynyc.com -
[Joseph Krings] “It occurs on the same clips when reconverted on different machines multiple times. The probelm only occurs later in the clips and these clips are 20 plus minutes long. “
there is a file size limit on the FRC.
YES Clips larger than 13 gigs are subject to drift. (about 15 minutes)
The original FRC would not work on files larger than 8 gigs.gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
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