[Jeff Cadge]

I haven’t shot a music video in years but I can tell you sync will be an issue. I suggest you use playback audio of the recording and shoot as many takes as you can before the live performance perhaps during the sound check. And shoot the live performance with audience shots and combine them in post.

Jeff Cadge
Cadge Productions Inc.

[Jeff Cadge]

We got to the bottom of the 720 30P judder with our HPX2000, maybe an obvious solution to some but not to my editor or myself. Yesterday we did a number of 90-degree panning tests (pans with 5-10 second durations) shooting HD & SD, 24P & 30. Regardless of the resolution or panning speeds 30P had virtually no judder compared to the 24P footage.

Jeremy, I tried 60P in the past but felt you lose the progressive scan feel, I always had good results with our SDX900 shooting 30P with very little judder but maintaining the progressive “film” look.

When viewing the test pans, the 30P pans looked great on a 29.97 sequence but if you attempt to place the same clip on a 23.98 sequence and render the 30P clip it plays fine except for pans where there is judder. Our lesson from the P2 tests:
if you shoot a mix of 24P & 30P clips, edit on a 29.97 sequence.

What prompted my post was the judder we experienced in a recent project shooting with the HPX2000 720P. I shot interviews in 24P to give a softer look and our B-roll in 30P to reduce judder in pans.

We first brought our 24P interview footage into a sequence establishing a 23.98 timebase, which looked great. When we eventually brought the 30P B-roll into the sequence, we had to render the clips. After the render the 30P B-roll played OK, (most of the B-roll was not pans so we thought we were OK.) But we did have 2 panning shots that had judder which I thought was due to the camera panning.
But was in fact due to the 23.98 sequence, the same clips played fine without judder
on a 29.97 sequence.

Thanks for your help.

Jeff Cadge

[Jeff Cadge]

Thanks for the response Jeremy,

Yes I call it strobing but I see judder is the proper term.

The shutter on both cameras is set at “half”.

The judder happens the most when panning or dollying at certain speeds, I shoot a lot of “run & gun” B-roll w/o a monitor and found shooting with the sdx900 @ 30P reduced that overall judder compared to 24P.

When shooting 720P @ 30P the judder just seems more apparent then SD 30P.

I’m going to do a side by side 180° pan using the HPX2000 shooting both SD & HD and let you know my results.

It’s interesting to see you shoot mostly at 24P with your HPX2000, how do you work around the judder issues?

Do you follow any rule of thumbs as to the amount of time a 90° or 180° pan should take?

Thanks,

Jeff Cadge