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Old July 23rd, 2007, 10:54 AM   #1
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Capture Uncompressed DigiBeta to Mac

Hi All,

Sorry if this question has already been answered, I did search with no luck.

First, a little background.

I'm working off a Non-Intel, Dual 1.8Ghz PowerPC G5 with Final Cut Studio 2 and 3.5GB RAM.

My goal: Capture uncompressed footage from Digibeta / DVCam / HDV tapes.

Main question: What connection would successfully capture uncompressed Digibeta / DVcam / HDV footage?

Secondary Question: What video card do you suggest I purchase for said purpose?

I've been looking into these:

http://www.aja.com/html/products_macintosh_kona.html

Third Question: Does anybody know how much Hard Drive Space 1 minute of uncompressed Digibeta footage takes up?

Thanks a million, guys! Any feedback is much appreciated!
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Old July 23rd, 2007, 01:05 PM   #2
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Update

Ok well just to update my own questions here is what I have found:

Using the Sony DVW-A500 and the AJA Kona 3 LH I can transfer 4:2:2 into the computer. I plan on renting the Sony deck and buying the Kona. (Anybody know any local deck rental facilities in the Maryland/Virginia/D.C. area?)

Now, my ultimate questions are;

Does FCP 6 capture uncompressed via SDI (BNC connector) ?

What settings should I use? Is the ProRess422 codec involved in this somehow?

At this point I might be confusing myself. Any help is much appreciated!

P.S. I'll have a workflow diagram up here soon
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Old July 23rd, 2007, 02:13 PM   #3
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Diagram

Does this make sense to you guys?

Let me know if I'm taking the right steps here.

Thanks!



http://img514.imageshack.us/img514/1...orkflowxh7.jpg
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Old July 24th, 2007, 01:50 PM   #4
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If you want to capture uncompressed, you will need hard drives that are fast enough. Usually you capture to a RAID array of 2 or more drives.

Alternatives would be...
A- Capture into the ProRes codec. I'm not sure if you need the new AJA IO box to do that. This captures with compression so that you can use a single hard drive.
B- Use Sheervideo's codec for lossless video compression. I haven't worked with this... I don't think you get real-time effects with this codec.
C- Capture with FCP transcoding the video into some sort of compressed format. The Aja cards for example can transcode to DV (and I think DV50) as you capture.
D- Dub the tapes to DVCAM or DV.

If you are looking for online quality, your best option is likely to get a RAID array and to get a Kona capture card. Various vendors sell RAID enclosures.
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Old July 24th, 2007, 01:57 PM   #5
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To hook up the dbeta deck to your system, use a single BNC cable from SDI out to the SDI in on your capture card.

Use a serial cable for deck/VTR control. http://en.wikipedia.org/wiki/Serial_cable
You'll need deck control if you want to log & capture. Log & capture is a PITA but it saves drive space (as opposed to capturing entire tapes, laying markers at the cut points, and making subclips).
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Old July 26th, 2007, 05:09 PM   #6
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For Digibeta and DVCAM the uncompressed stream is the same size (it's both SD, only with different compression ratios on tape)

R,G,B with 4:4:4 is 324 Mbit/s (=40,5 MB/s)
Y, CR, CB with 4:2:2 @ 10 bit is 270 Mbit/s (=33,75 MB/s)
Y, CR, CB with 4:2:2 @ 8 bit is 216 Mbit/s (=27 MB/s)
(For PAL, I'm not sure if it's exactly the same for ntsc)

This is video only, you'll additionally get 2 or 4 uncompressed audio channels @ 48kHz, 16 bit.

For HDV the data rates will be a lot higher uncompressed, but I can't tell you how much because my books are too old to feature HD resolutions and I'm not much of a mathematician ;)
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