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Capturing DV - tape or firewire?

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dave Niasse
Capturing DV - tape or firewire?
on Jan 14, 2010 at 8:17:17 pm

After reading this thread about keying, here's my question:
Is there any difference capturing from a DV camera directly at shoot time with a FireWire cable or from a DVCAM tape inserted in a deck (DSR 25)?

I am asking this question due to keying problems, and we are thinking to capture directly to harddisk with a f/w cable(in Matrox DV). May this help?

PS: is there any cable length restriction?

TV have been made in our image, and our likeness


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Micah McDowell
Re: Capturing DV - tape or firewire?
on Jan 14, 2010 at 8:39:50 pm

As was mentioned in that thread you read, the answer to your question is pretty much no.

If you're using the Firewire port on a DV cam, it's automatically already compressed to good old DV25, nasty looking compression. Recording to a hard disk or DVCAM deck gives the exact same result as miniDV in-camera.

The other thread already gave great suggestions for keying highly compressed footage. Your only other option is obtaining an uncompressed signal from your camera and capturing it to a computer using a capture card, but most DV cameras do not have this ability. What camera do you have?


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dave Niasse
Re: Capturing DV - tape or firewire?
on Jan 14, 2010 at 10:29:57 pm

Thanks a lot. I was guessing so :)
We have a few DSR 250 & 390's. well... we'll try "keylight", better greenscreen settings, creativecow forum and so on :-)

TV have been made in our image, and our likeness


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Richard Crowley
Re: Capturing DV - tape or firewire?
on Jan 16, 2010 at 5:07:14 pm

DV25 is spatially compressed 5:1 right in the camera. That is the definition of "DV25". It is the same bit-stream whether you grab it live out of the camcorder or record it to tape and then play it back.
(With the possible exception of tape artifacts.) DV25 is NOT temporally compressed.

Note that because DV25 uses 4:1:1 compression (4x as many green samples as red or blue), using GREEN screen (vs. BLUE screen) generally will allow better results when trying to chroma key with DV25.


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