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TC Rate Issues
I’ve got DVCPro HD 720p60 footage that was captured at 23.98 using firewire, and the same footage that was captured using an Aja Kona LH card also at 23.98.
Maybe there’s a simple switch for this that I dont know of, but the firewire footage shows up with a TC Rate of 60 while the Kona card footage shows up with a TC Rate of 30. The media is identical, but the frame counters are of course way off inside of every even second.
How do you set the TC Rate when capturing? I now have to switch all the 60’s to 30, which changes the tc slightly but makes it accurate to the tape. Online would have been a problem down the road, yes? Or am I missing something ridiculously basic here?
Thanks.
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5 Replies
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[Jeff] “I’ve got DVCPro HD 720p60 footage that was captured at 23.98 using firewire, and the same footage that was captured using an Aja Kona LH card also at 23.98.
Maybe there’s a simple switch for this that I dont know of, but the firewire footage shows up with a TC Rate of 60 while the Kona card footage shows up with a TC Rate of 30. The media is identical, but the frame counters are of course way off inside of every even second.”
FCP cannot capture 60 footage at 23.98 via Firewire unless it was really shot at 23.98. It will recognize that the footage is 60 and capture it as such. If you want to change the speed of the footage, then you would use the FRC tool from Panasonic.
The Kona WILL allow you to capture 60 at 23.98 because you may be trying to achieve a speed effect.
Walter Biscardi, Jr.
https://www.biscardicreative.com“I reject your reality and substitute my own!” – Adam Savage, Mythbusters
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The video rate of all clips is 23.98 and was captured at 23.98, but it’s the TC Rate that reads 60. So the speed of the clips is consistent, but just the counting of the frames in FCP is off.
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You mean the COMPRESSOR TYPE is reading as 720p60? That is right. But if the footage is 23.98…determined by the in camera timecode setting…then it will capture it at 23.98.
Shane
Alokut Productions
http://www.lfhd.net -
This is correct as well, but the question is different:
Compressor is 720p60
Footage is 23.98All is well there.
But:
media captured via firewire shows a TC Rate of 60 (video rate is 23.98fps) while media captured with Kona shows a TC Rate of 30. The same clip captured by two different cards will then display different time code.
My question is why two different TC Rates for identical clips, since this would cause big problems later?
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[Jeff] “media captured via firewire shows a TC Rate of 60 (video rate is 23.98fps) while media captured with Kona shows a TC Rate of 30.”
Correct the FW capture is listing the TC as the native numbers (but note if you go into the 720p24 Easy setup setting the TC spec is 29.97)
The Kona Cards is issuing TC based on the assumption that most all video uses a 29.97 timebase and FCP cannot capture.
Both are doing what they think is correct, but there is not simple solution with out capturing the footage at 59.94 and running the Software FRC on it.
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Chicago, IL
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