????? Small glitches in footage (dropouts?)

Deuceofspades

Deuceofspades

Veteran
I have noticed occasional glitches in my P2 card footage. They look like a few frames are missing out of a clip, causing the image to "jump" suddenly, and then it resumes normally. It almost looks like a quick "shift"

I have seen it about 3 to 4 times so far. I have filmed about 2 hours worth of footage.

What is causing this? My battery was not empty at the time. I cannot see a pattern.

Defective camera? P2 card? Or??
 
You needd to check all your parameters.
Does it happen on Color Bars?
Does it also happen on SD, on Tape etc?
How often does it happen?
Is it related to moving or jarring the camera, etc.

I just had a problem with my HVX shooting weird white flashes that did not appear from bars or tape. That narrowed down the problem and the camera is at Panavision for repair now. Your problem sounds significant if you see it in the camera playback itself.
 
Deuce, was OIS turned on? I've heard others get caught by this. If you are on a tripod and the image stableizer is on, it will do exactly as you mentioned...well, as I read it any ways. :)
 
Answers to your above questions:

1. It can be seen IN CAMERA when playing back the clip.

2. the camera was on tripod.

3. YES my IOS is ON.

IF the IOS caused the shifts when the camera was operating on tripod, my question is of course WHY? Does this mean I need to always turn OIS off unless handholding camera?

Note that I am almost always either on tripod, jib, dollie or steadicam, since I am filming a feature film. I rarely need the "shaky" action handheld look.
 
Yes, turn it off when you're on a tripod (or any other stabilizing device). That's standard procedure and is recommended in the manual, IIRC.
 
Deuceofspades said:
IF the IOS caused the shifts when the camera was operating on tripod, my question is of course WHY? Does this mean I need to always turn OIS off unless handholding camera?
Click to expand...

OIS tries to correct for camera motion - it actually shifts the image so that motion of the camera is canceled. However, OIS has a limited range in which it can operate... so when the motion of the camera is more than OIS can handle, what happens is that OIS shifts the image in order to stop the motion for as long as it can, then "snaps" back to the centered position suddenly. So any motion more than "excessive handheld shankiness" (such as a pan on a tripod) has the potential for this kind of stuttery jumping.
 
Exactly -- and the tripod is already stabilizing your motion, so why put on a second stabilizer (OIS) only to have it "fight" the tripod?
 
ullanta said:
OIS tries to correct for camera motion - it actually shifts the image so that motion of the camera is canceled. However, OIS has a limited range in which it can operate... so when the motion of the camera is more than OIS can handle, what happens is that OIS shifts the image in order to stop the motion for as long as it can, then "snaps" back to the centered position suddenly. So any motion more than "excessive handheld shankiness" (such as a pan on a tripod) has the potential for this kind of stuttery jumping.
Click to expand...

Ullanta, thank you for this well worded explanaiton. makes sense now. funny, I always used the tripod with the DVX100B with IOS on and never had that happen. Guess the HVX has a better OIS or more sensitive then ... ? now I understand why they put a nice OIS button under the LCD display :).
 
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