How can I avoid "ghostpictures"?

B

benn

Well-known member
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This is a shot with the 5D MKII. How can I avoid this
 
Untick 'Frame Blend' in your editing program. On Adobe Premiere it's right click the clip.
 
do a good quality 24p conversion before you send anything to vimeo otherwise vimeo will automatically do a crappy one.
 
Dont you think it could be a shutter issue? If you filming shots like this with 1/500 sec, could it give this "doubling", cause it didnt mach the framerate and is right "between" thge frames?
Benn
 
benn said:
Dont you think it could be a shutter issue? If you filming shots like this with 1/500 sec, could it give this "doubling", cause it didnt mach the framerate and is right "between" thge frames?
Benn
Click to expand...

No. The sensor's EXPOSURE TIME wouldn't have anything to do with this.

What you're seeing is far too clean and too distinct to be any sort of real motion blur.

Have you tried turning off frame blending [there wont be ghosting but it will be jerky...] or using some sort of high quality optical flow blending?
 
this is purely a 30p to 24p conversion that is being done straight out of the NLE or a bad conversion.
 
I am working with EDIUS. Do you know, how "frame blending" was called there?
Thanks Benn
 
benn said:
Dont you think it could be a shutter issue?
Click to expand...

It is not a shutter issue.

benn said:
If you filming shots like this with 1/500 sec, could it give this "doubling", cause it didnt mach the framerate and is right "between" thge frames?
Click to expand...

1/500 does match the frame rate.

All shutter speeds above 1/30th match the frame rate.

If you have 1/30th of a second (the frame rate) to capture a 1/500th of a second exposure (the shutter speed) - then there obviously is no mismatch of any kind, 1/30 of a second is plenty of time to make a 1/500th of second exposure.
 
[FONT=Arial, sans-serif]Sorry, I still dont understand why there are „ghostpictures“.[/FONT]
[FONT=Arial, sans-serif]Is there somebody, who can explain, how they create a framerate on a chip of a dslr camera? In classical movie technique you need a shutter to create framerates.[/FONT]
[FONT=Arial, sans-serif]But how does it work in a dslr, where the shutter seems to be open all the time while recording? And is there no depence between shutterspeed and framerate?[/FONT]
[FONT=Arial, sans-serif]Thanks Benn[/FONT]
 
benn said:
[FONT=Arial, sans-serif]Sorry, I still dont understand why there are „ghostpictures“.[/FONT]
Click to expand...

The ghosting is being introduced by your computer somewhere in your post processing, it looks like you have 'frame-blended' the footage at some stage - perhpas when converting the frame rate (?)

Have a look at the original h.264 footage from your camera - go to the same frame - you will see there in no ghosting.

This is being introduced after the footage has been shot and moved to your computer, so things like shutter speed and frame rate are irrelevant here.

benn said:
Is there somebody, who can explain, how they create a framerate on a chip of a dslr camera? In classical movie technique you need a shutter to create framerates.
But how does it work in a dslr, where the shutter seems to be open all the time while recording?
Click to expand...


The mechanical shutter is open all the time in LiveView mode.

The video mode uses an electronic rolling shutter.



benn said:
And is there no depence between shutterspeed and framerate?
Click to expand...

Not sure what the word 'depence' means ?

The frame rate is how many pictures the camera shoots per second.

The shutter speed is how long each of these frames is exposed for.
 
Yeah what Lee Wilson said.

I'd like to add 'why ghost pictures are there'. It's because your editing software EDIUS is trying to make a new FAKE frame between two REAL frames. It's doing this by splitting the difference and blending the two in a crappy manner.

This happens if your editing output timeline is not the same framerate as the input.

As the Canon shoots 30p, your timeline sequence isn't. (ie: 29.97, 23.97, 24, 25 etc) which is why I suggest you work at 30p and stay at 30p. If you introduce slow motion or fast motion to the clip, it will cause the same ugly frame blending effect.
 
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