Question for HDV JVC GY100 users

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Level 1

109 points

Question for HDV JVC GY100 users

I've been using the JVC GY100 camera for about 5 months now and really love it. I'm shooting a documentary project and decided to shoot in HDV 30P because I had heard there were problems with HDV in the 24P mode when editing with FCP. Although the footage looks great most of the time, there is one thing that really bothers me. It's a frequent vibrating (moree - spelling?) that occurs when shooting bright objects, usually with striped patterns. I was advised to reduce the detail setting on the camera, and this has helped a bit. However, on another job, I was required to shoot (with the same camera) in SD24P. I must say, I really prefer the appearance of the footage in this mode. There was no moree effect, I had more latitude with F stops, focuse was a little less critical, and it looked way more like film, not to mention, it takes up far less hard drive space. I'm seriously considering switching all of my projects to SD24 P, but I know it will cause massive complications. I know the down conversion from HDV to SD is not a problem, but what about HDV30P to SD 24P? Am I crazy to do this? I'm really not sure what the great advantage of HDV is, other than cause headaches.

G4, Mac OS X (10.2.x)

Posted on Nov 12, 2006 6:41 PM

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Answer 1

DFvideo

Level 2

150 points

Nov 12, 2006 7:07 PM in response to Laura Paglin

I shoot with HD-100u's. With Final Cut 5.1.2, the problems (at least from my standpoint) don't exist any more with JVC 720/24p "ProHD" captures. Final Cut now accepts the format natively. So if you want to shoot in 24p HDV, don't sweat it.

By the way, I hear HDV takes up less space than DV. So going SD doesn't save you space.

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Answer 2

Laura Paglin Author

Level 1

109 points

Nov 12, 2006 7:16 PM in response to DFvideo

Interesting. I'll have to try HDV 24P. Have you compared it to HDV 30P? Do you notice any of the effects I described above in the 30P mode? I don't understand how HDV could take up LESS space than DV. That simply doesn't make sense.

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Answer 3

Studio X

Level 7

27,229 points

Nov 12, 2006 7:27 PM in response to Laura Paglin

DV is made up of complete frames. Each frame of DV footage contains the full image.

HDV is made up of a 15 frame GOP (group of pictures) where only the first frame is a full (I frame) and the next 14 contain only the differences from the first frame. The effect is a highly compressed mpeg2 video stream that is less than DV.

good luck.
x

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Answer 4

DFvideo

Level 2

150 points

Nov 12, 2006 7:34 PM in response to Laura Paglin

When you shoot in DV, you get every frame of video. The compression only comes into play in each frame. With HDV, it uses groups of frames. So instead of each frame having to have all of its info, HDV relies on the ones before it to see what needs to be changed in the next frame and what can just remain the same. So you end up compressing the video much like a DVD. Take a trip to google on "HDV" or "GOP Compression" for more info.

But in a nutshell, HDV gets smaller than DV by relying on the processing power of the decoder, rather than data space.

The JVC cameras have alot of settings. I would agree with your friend on the sharpness thing though.

Comparing with 30p, the 24p will give you a much more "filmish" look in my opinion.

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