Is that a progressive shooting??

Y

Yiota

New member
Hello guys.
I need help with technical video issues because searching the internet I could not be helped properly or be sure with confidence.
I deliver my works on dvd (PAL EUROPE), but I would like sometimes upload any of these clips work to youtube, vimeo.
One case requires interlaced video, while the other progressive. It is more efficient of shooting progressive and convert it to interlaced, as many say. But watching the result of the conversion from interlaced to progressive to dvd, I realise that it does not have the same smoothness as an already interlaced video.
We work with camera Panasonic AG-HVX200E and I dared to shoot for the first time with 25p and 50i (576). The properties of clips see both interlaced (lower fields). When I import them to Adobe Premiere, the suggested sequence is with lower fields. At metadata again I see lower fields. How can it be explained; The only difference I could find between the two clips through their properties, was that at the 25p indicated pulldown 2:2.
1080p properties refers to the progressive, but the pulldown 2:2 too.
What's going on? :confused:
 
First, pick your frame rate because it has the motion you want in your video, not because of how you're going to deliver it.

Second, except in 720, 25p material is stored in a 50i stream with 2:2 pulldown, as Premiere is telling you. That doesn't change how the video looks. Frame rate is about motion, and it will still have 25p motion. But the frames are split into interlaced fields and stored in the video that way.

Any of the footage you shot as 25p, you should be able to edit in a 25p sequence.

When you play back 25p footage in a 50i stream, the 2:2 pulldown causes the video to play a field made from the first frame, and then another field made from the same frame, so in effect, it's showing the same frame twice. It shows 50 fields per second, but because two fields are made from one frame, it shows the same frame twice, so it's the same as showing 25 frames per second. It looks the same as 25p.

That is how PAL DVDs work. 25p material is stored in that 50i stream with 2:2 pulldown.

(This is all explained and illustrated in the 24p & Frame Rates video tutorial.)
 
David Jimerson said:
First, pick your frame rate because it has the motion you want in your video, not because of how you're going to deliver it.
Click to expand...
Why? Delivering is the most iportant than a small clip for the internet. I know it's much better but which are my options to do that? I don't want to shot on 720 or 1080 (I have my reasons). I need 576 but... 25p or 50i? I have no problem to put my 25p footage to 25p sequence. Premiere proposes me an interlaced sequence. Thank you so much for your help. :)
 
Yiota said:
Why? Delivering is the most iportant than a small clip for the internet.
Click to expand...

Because you should be chiefly worried about how it looks rather than how it's delivered. You are creating a visual experience.

But if that doesn't matter to you and you don't care how it looks, and all you're going to do is deliver it to YouTube, then you have no reason to ever shoot 50i, because you can't deliver it that way. Stick with 25p all the way through and save yourself any worries.
 
David Jimerson said:
all you're going to do is deliver it to YouTube, then you have no reason to ever shoot 50i, because you can't deliver it that way.
Click to expand...

Oops! I think my bad english confused you. I 'm so sorry...
My delivery is dvd disc and 50i is better than 25p. I tried to export 25p to 576i and I saw flickering :s
Panasonic doesn't have 50p on 576 to check the result on dvd, so I must try the 720 50p.
Thank you so much for the help!!! :)
 
You should not see flickering if you edit the 25p on a 25p timeline and then export to 50i for DVD. Make sure frame blending is turned off.

Maybe what you actually like is the smoother motion of 50i? That is what I was referring to, picking your frame rate because it's what you want your footage to look like. You can have the look of 25p or the look of 50i on a DVD. Pick the one you like.

Nobody has 50p at 576; that doesn't exist, and you wouldn't be able to put it on a DVD as 50p anyway.
 
If you need smooth motion, the best is to shoot 50i and create a web version either by deinterlacing the full resolution or simply by taking half resolution (it is the simplest way to deinterlace).
Usually it is easier to shoot progressive, because you can cut all the problems encoutered with interlacing.
But progressive is also more difficult to shoot, because many people can notice the "stroboscopic" effect if you choose the wrong parameters.
 
nosys70 said:
If you need smooth motion, the best is to shoot 50i and create a web version either by deinterlacing the full resolution or simply by taking half resolution (it is the simplest way to deinterlace).
Usually it is easier to shoot progressive, because you can cut all the problems encoutered with interlacing.
But progressive is also more difficult to shoot, because many people can notice the "stroboscopic" effect if you choose the wrong parameters.
Click to expand...

When you convert 50i to 25p, which is what happens when you deinterlace, you take on the motion of 25p and you lose the 50i motion smoothness. The result will be the same as if you shot 25p all along, though you may introduce more problems, like ghosting if you simply blend fields together instead of interpolating frames out of single fields.

The strobiness has nothing to do with the footage being progressive. It has to do with it being a slower frame rate with fewer pictures per second. You simply have to move the camera slower to minimize it.
 
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