I think stuttering video is from lack of blurring.

Y

YellowGT0

Member
Okay so today I ask roei z to send me one of his videos so I could test my theory. I took a motion clip from the GH2 and a motion clip from I am legend 1080p Bluray. When you look at the screen shots you can see considerably more blurring on the production video. I think this is why you can see a stuttering effect on the GH2. The frames seem to be to clear for fluid motion at only 24 persecond.

you can see them here.
www.dangdeals.com/video2
 
I have something to go to, But I will go and check some more 24p high def video when I get home to see if anything real production video has as little blurring as GH2 video.
 
This could relate to shutter speed settings. Film cameras are mostly run at 180' shutter, effectively 1/48 sec shutter speed. Even at 24fps, if the camera is shooting at higher shutter speeds than 1/50 sec you will get proportionally less motion blur and more stutter. Saving Private Ryan shot combat scenes at 1/96 sec 90' shutter to get that staccato motion quality for example.
 
BINGO- shutter

"Saving Private Ryan" scene- yep it's becoming an all too familiar style of shooting these day, I'm seeing an awful lot of it on TV. It's really a great effect when used to evoke some kind of tension out of the viewer for a specific scene such as the sav. priv.ryan shore scene. But I've seen almost entire shows shot with a high shutter---only thing it's evoking from me is a headache:zombie_smiley:.
 
Ha ha...well....it worked for "Crank 2." Most of that movie was high shutter speed on a Canon A1 and H10. Love it or hate it ....it definitelty kept my pupils dilated.
 
Use whatever shutter speed you want. Just practice and know why you're using it.

When the 5D hit the scene, and everyone was "ooh" and "ahh" over the footage they were seeing in internet browser windows, I think a lot of it was because of high shutter speeds and frame rates. It's a feast for the eyes on YouTube...but not so much for an epic film. Then again, it's been like 10-15 years since anything from Hollywood has impressed me enough to go to a theater...so I'm far from a modern cinematography expert. :D
 
You're all telling us shutter speed suppose to be
1/50... well it WAS.. so this is not the problem.
 
just more evidence that the sensor is capturing at a high speed(60P?) and the "24P" is just being assembled in processing with "shutter" effect being done in software.

Gotta remember that all these numbers really mean nothing. You are at the mercy of some coder who interpreted this stuff in their own way.
 
Unless you are shooting 24p, gh-1 is 24 in a 60 or 30 (or just 30i) wrapper can't really remember, what does matter is I have found that shooting AVCHD on my gh-1 that a shutter speed of 60 results in the smoothest motion for me (and anything in multiples of that I believe or maybe that is just for shooting monitors).

It's also to important to note that how you deal with the footage in post has a lot to do with this as well, make sure to do a proper de-interlace (I find 24 smoother than 23.^&*$) and that your project settings all match ( honestly I don't think my work flow is very good so maybe some other can help you here if you need it).

I found that I had issues with stuttery footage but for the most part the errors were my own and not the cameras. kind of busy and this is a weak explanation most likely you know all of this, hopefully you find and fix your issue.

happy shooting!
 
Motion in the 2 clips is of a different type for a starter.

Will Smith is getting out of a car, there would be alot more motion in this scene than Roei turning his head while walking. Plus the camera is panning up, the framing is different.
 
Svart said:
just more evidence that the sensor is capturing at a high speed(60P?) and the "24P" is just being assembled in processing with "shutter" effect being done in software.

Gotta remember that all these numbers really mean nothing. You are at the mercy of some coder who interpreted this stuff in their own way.
Click to expand...



+1
 
roei z said:
You point it out as a good thing or bad thing?
Click to expand...

Neither, just provided a motion blur clip for Matthew P. :)
EDIT: But me personally, I like motion blur. I dislike fast shutter speeds if it has no purpose of being there other than technical or gear limitations.
 
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ok, so what's the delicate motion blur were seeing on feature films and missing from the GH's? or all dslr's in that matter ?
going lower than 1/50 is unusable for shooting. the wrong motion blur.
 
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