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Decklink convert 29.97 to 23.976

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Jeremy Ball
Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 12:16:59 am

I am working on a long format doc that started shooting about a year ago. Most of the footage is 23.976 but I would say 3 or 4 hours of interviews are shot at 29.97.

Instead of using compressor or some other software and days of render time to do the 23.976 conversion could I string together the interviews in a timeline and play them out through the Decklink with it set up to convert 29.97 to 1080p 23.976. Then route that signal to another Final Cut station with a Decklink and do a wild capture at 23.976.

Would this type of hardware frame rate conversion work without any artifacts like what happens in a software frame rate conversion? Any ideas?

I posted this on the Blackmagic forum as well.



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John Pale
Re: Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 12:45:20 am

The Decklink will not convert video frame rates. Nor will any other capture card.


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Shane Ross
Re: Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 1:25:15 am

Yes it will...on output. All capture cards can convert the frame rate on output.

Worth a shot. But know that when you do this, you no longer will have ANY reference timecode to the original footage. So if you lose your drives, or need to revisit the cut...you're hosed. Unless you archive it all.


Set the decklink to convert on output...the other to capture what you need. Do tests...

Shane

GETTING ORGANIZED WITH FINAL CUT PRO DVD...don't miss it.
Read my blog, Little Frog in High Def


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Jeremy Ball
Re: Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 2:34:58 am

Would the motion look smooth like a horizontal pan? I only have a decklink card as of now so I can not do any tests without investing in another card so I can not do any tests right now.

If someone says the 29.97 play out to 23.976 capture would work well then I would invest the money.

Has anyone tried this before and what were the results?

Thanks



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John Pale
Re: Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 2:48:34 am

Decklink will remove pulldown but it will not CONVERT 29.97 to 23.98. If your footage is plain old 29.97 interlaced footage, no capture card will convert that to 23.98 smoothly. You need a Teranex, Snell and Wilcox, etc. for that.


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Shane Ross
Re: Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 3:25:46 am

OOOOOOohhhhh.. 29.97 to 23.98 upon output. Sorry...I am wrong. You cannot convert 29.97 to 23.98 via a capture card. Only 23.98 to 29.97...and 23.98 to 59.94. It will ADD pulldown, not remove it.

Shane

GETTING ORGANIZED WITH FINAL CUT PRO DVD...don't miss it.
Read my blog, Little Frog in High Def


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Shane Ross
Re: Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 3:26:22 am

OOOOOOohhhhh.. 29.97 to 23.98 upon output. Sorry...I am wrong. You cannot convert 29.97 to 23.98 via a capture card. Only 23.98 to 29.97...and 23.98 to 59.94. It will ADD pulldown, not remove it.


You are right John...thanks

Shane

GETTING ORGANIZED WITH FINAL CUT PRO DVD...don't miss it.
Read my blog, Little Frog in High Def


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Jeremy Ball
Re: Decklink convert 29.97 to 23.976
on Oct 25, 2011 at 1:30:40 pm

Thanks for the replies. I thought it was only 24 to 29.97 but I wanted to see if I missed something. I might try looking into the AJA FS1 which supposedly converts most standard signals into any other standard.



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