Problem 25i and 25p

[Andrew Smith]

Could you please upload a one minute sample and upload to YouTube? Then post the link here. It might be easier if we can see what you are talking about.

Andrew

[Primoz Lazar]

Hey, problem on 00:53.

UFF - YouTube

Any export does that. That is happenin on televison.

On Youtube this wouldnt be If I would be epxported right, but you must se what is seen on television.

Best, Primoz

[Andrew Smith]

Well, I've seen the lagging ... and it's not a progressive vs interlaced issue.

It looks to me as if the shutter speed on the video camera is too fast. This is why you aren't getting enough blur in the frames and hence the visual stepping / lagging / juddering. You should probably have it set to something like 1/50th sec or even as low as 1/25th sec. for your PAL frame rate of 25fps. (Especially if the dominant lighting is fluorescent.)

Can only suggest that you might add a motion blur filter to the areas of the footage where this visual juddering movement is obvious.

[Are any others reading this thread able to offer some advice or thoughts? Just in case I am wrong, that's all.]

Andrew

[Steve Game]

Not sure if you can do this in Premiere but I would create a 50p timeline and put the clips on. If the field time data is correct, the timeline will consist of pairs of identical frames created from the 25p clips and interpolated frames created from each of the two interlaced fields. Frame-by-frame examination will reveal whether the field order is correct. (e.g., check that the movement between frames is in the same direction and not two steps forward and one step back)
If it is correct, just render to 25i or 25p as required. If it is wrong, render a non-standard field order and edit the file's metadata to show the opposite field order. I've found a webpage that gives the following for Premiere Pro:

Change the field order of a clip

In the Project panel, you can change the field order of all instances of a clip in all sequences of a project.

1) In the Project panel, right-click the clip for which you want to change the field order.
2) Select Modify >Interpret Footage.
3) Choose the desired Field Order option.
4) Click OK.

Not sure whether this works in current versions of Premiere CS or CC.

Hope the above helps.

[Primoz Lazar]

Hellou, hm, possible it is that shutter speed is too high, That is recorded with 5D mark 3 and shutter was 1/100. I will try with frame blending.

Steve, I already tried INTERPRET FOOTAGE but I am going to do it again and with different moves.

Thanks, I ll study your advices.

Andrew, maybe shutter speed doesnt matter so much, because the image on 0:41 minute is recorded with go pro which has 25p too and it is lagging too.

I think thats all because progressive image.

I ll try to interpret footage and do some tests with shutter speed.

Tnx, Best, Primoz

[Andrew Smith]

A shutter speed of 1/100th sec will be too fast ... so this is your problem behind the issue with the footage.

The "interpret footage" function is not what you need. You need to get some motion blur happening between the frames in order to simulate a slower shutter speed. (Not sure what the story is with the GoPro and its footage.)

Andrew

[Ann Bens]

The pan in the example is way too fast.
When filming with 25p one needs to pan very sloooooooooooowly.
50p is more forgiving.

[Primoz Lazar]

Ok tnx.

Hm, Speed of panning cant be problem in movie making production :P

Now I used function in Premiere, right click on clip - FRAME BLENDING, It is better I think, maybe I did it wrong when I recorded with shutter 1/100, I ll do some tests.

[Ann Bens]

Panning speed is a big problem, its even worse in 24p.
Set shutter speed to 1/50.

[Primoz Lazar]

Ok, I ll set shutter speed at 1/50 and ll do some tests.

Tnx

[Primoz Lazar]

Ok, shutter speed doesnt matter so much.

Here comes idea.

If you convert 25p to 50i, that could be cool.

Premiere has a function INTERLACE CONSECUTIVE FRAMES which DO ITS JOB, but goes 200% FAST motion.

But on television is cool, not lagging like before, nice INTERLACED. But problem with speed, double speeded.

Hm, maybe I ll do it, 25p to 50i... but how .D

[Primoz Lazar]

Guys, I solved problem.

I converted 25p to 50i with Adobe After effects - Layer - Frame Blending Pixel motion, and than I exported sequence as Upper field first.

That was only way to convert 25p to 50i.

Best regards, Primoz

[Andrew Smith]

Glad to know you have a solution there.

Andrew