How To Reduce Strobes In Progressive?

P

producer

Well-known member
Hi everyone,
I just captured from my miniDV cam (PAL 25 Interlaced), and after rendering out to DV AVI PAL Progressive, very obvious strobes are visible in the motion scenes, even if the motion is slow. So, what settings are needed so that to reduce this terrible strobed look to minimum? Any advises?
 
Working with 25P using a progressive scan videocamera means setting your shutter speed correctly, just like with a real film camera (too high means strobing, to low results in too much motion blurring). When you do a software conversion of 50i to 25P video, this is something that you have to tweak within the render settings. I'm not sure if Vegas gives you this possibility, but I've read somewhere on the internet that DVFilm Maker has these kind of options. But in the end, 25P will always a little strobing, but if you follow the same rules as 35mm camera operators do, you'll be fine.
 
Producer:

As said above 24p or 25p is subject to stutter or strobing if you move the camera to fast. You will also see noticable strobing/stutter if you view progressive footage 24p/25p on an interlaced TV instead of a progressive scan monitor like a computer screen or LDC TV.

S Cannon
 
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7 second rule... try not to have any objects moving on relation to the frame at a speed at which they'd cross the whole frame in less than seven seconds.

to keep this rule from being so limiting you could think about adding an object or objects that are in the frame while you are panning or moving fast, and since these objects won't be strobing like the rest of the frame they will therefore be clear. Then the viewer will automatically focus on said object much like when there are objects out of focus, and because of this they won't notice and be bordered by the strobing as much...
 
scannon said:
Producer:

As said above 24p or 25p is subject to stutter or strobing if you move the camera to fast. You will also see noticable strobing/stutter if you view progressive footage 24p/25p on an interlaced TV instead of a progressive scan monitor like a computer screen or LDC TV.

S Cannon
Click to expand...


If you move the camera too quickly, you'll see the strobing on any screen.
 
David Jimerson said:
If you move the camera too quickly, you'll see the strobing on any screen.
Click to expand...
Yes, it is so, but when I watch some movie, I see that the strobing/stuttering lines are VERY smooth and fine (small), with very high frequency, while the same effect on my footages is with coarse and low frequency strobed lines.
Ok, look: I have a choice on my miniDV cam - to choose 1/50, 1/120, "sports", or just without any of previous options (raw, i think). So, I use 1/50, but is it the best I need for 25fps?
Also, after many variations of render and project settings I discovered that it is much better for my interlaced captured footage when I do this:
1.Changing the field order on the footage properties to progressive.
2.Project properties: progressive, deinterlaced method: none.
3 Rendering out to progressive.

Another question: on the footage properties -> media I see an option "use custom timecode". What does this do and why should I need it eventually? What is the reason to change the timecode?
 
My experience is that 1/50 shutterspeed is a good general setting for 25P shooting.

With the 1-3 steps, you are writing about de-interlacing interlaced (50i) video material. You're making it 25P afterwards. If you want 25P footage, shoot like that with the camera, that looks much better (resolution, motion).

Don't change or bother about timecode if you don't have any specific reasons.
 
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