Crop and zoom from 4K video using Davinci Resolve
3247 37 2021-11-30
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Blériot53
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After experimenting recently with the DJI Pocket 2 in SloMo (8x) mode, and then attempting to crop/zoom to detail, I achieved mediocre results, as the Pocket 2 will only record 1080 definition in SloMo.  (See my post 'Robin in SloMo' in the Nature section).
Looking back in my archives, I found a different subject (Scaling the Torrs) which I had shot at normal speed with the Pocket 2, but in 4K (3840x2160 @ 50 FPS)
As an experiment, I took a one-minute segment from this footage, and zoomed it to 300% in Davinci.
The results seems fairly good, but perhaps 200 to 250% zoom might be considered the maximum before some pixellation of the expanded image occurs.
Observations appreciated.


2021-11-30
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Depp
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50 fps slowed down to 25 fps already gives a nice "cinematic" slowmo. 300 % zoom does seem too much, even when viewed at the default resolution of the forum.  I try to keep below 150 % if I shoot and post in 4K unless it's a fast motion that blurs the view anyway. I think 200 % might be the maximum and only if the footage is good quality to begin with (i.e. no low light with noise...).
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Blériot53
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Depp Posted at 11-30 10:31
50 fps slowed down to 25 fps already gives a nice "cinematic" slowmo. 300 % zoom does seem too much, even when viewed at the default resolution of the forum.  I try to keep below 150 % if I shoot and post in 4K unless it's a fast motion that blurs the view anyway. I think 200 % might be the maximum and only if the footage is good quality to begin with (i.e. no low light with noise...).

Thanks Depp. I'll try your recommendations and see what happens
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Blériot53 Posted at 11-30 11:02
Thanks Depp. I'll try your recommendations and see what happens

Cheers.
Of course it depends of your finished product. If you go for 1080p then scaling 300 % out of 4K shouldn't be a problem...
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Blériot53
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Depp Posted at 11-30 23:04
Cheers.
Of course it depends of your finished product. If you go for 1080p then scaling 300 % out of 4K shouldn't be a problem...

I'll do a bit of experimenting with existing clips from my archives, and then go out and record some more stuff with a better understanding of what settings to use initially.  I'm still low on the learning curve
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DAFlys
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looks good,   maybe a spot of sharpening required.
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Blériot53
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DAFlys Posted at 12-1 00:56
looks good,   maybe a spot of sharpening required.

I think I over-zoomed. Still playing about with the software - and learning
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Blériot53 Posted at 12-1 01:03
I think I over-zoomed. Still playing about with the software - and learning

Maybe,  did you try any sharpening on it?
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Montfrooij
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It is not really working on a Full HD screen (or higher resolution).
Too much pixels.
It will work ok on phone maybe.,
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DAFlys Posted at 12-1 01:21
Maybe,  did you try any sharpening on it?

Not figured that out yet, but I think that could make matters worse. As Monty says - it doesn't look at all great on a full-sized HD screen.  The electrician is beavering away in the bathroom today, so we may have no current for a while.
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Montfrooij Posted at 12-1 01:22
It is not really working on a Full HD screen (or higher resolution).
Too much pixels.
It will work ok on phone maybe.,

Hi Peter. Yes, that was my finding as well.  Since it was only an experiment, I've lost nothing except time
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Blériot53 Posted at 12-1 01:34
Hi Peter. Yes, that was my finding as well.  Since it was only an experiment, I've lost nothing except time

You don't know until you try
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Montfrooij Posted at 12-1 01:40
You don't know until you try

I'll do some more experimenting, in between power-cuts. We have an electrician working in our home and he needs to switch off the current from time to time
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Blériot53 Posted at 12-1 01:44
I'll do some more experimenting, in between power-cuts. We have an electrician working in our home and he needs to switch off the current from time to time

Oh ok.
Something wrong?
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Montfrooij Posted at 12-1 01:53
Oh ok.
Something wrong?

No. New bathroom being fitted.
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Blériot53 Posted at 12-1 02:03
No. New bathroom being fitted.

Nice
Better than have some issue!
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Montfrooij Posted at 12-1 02:19
Nice
Better than have some issue!

3 weeks of upheaval though = plumbers, electricians, plasterers, tilers and painters.
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Blériot53 Posted at 12-1 02:28
3 weeks of upheaval though = plumbers, electricians, plasterers, tilers and painters.

Yes, I know that feeling.
We have some major home improvements coming up (when there is enough budget).
All the rooms on the ground floor (scullery, kitchen, living room, toilet and bathroom) are nominated....
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Blériot53 Posted at 12-1 01:32
Not figured that out yet, but I think that could make matters worse. As Monty says - it doesn't look at all great on a full-sized HD screen.  The electrician is beavering away in the bathroom today, so we may have no current for a while.

When you get the power back this might help -

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Montfrooij Posted at 12-1 02:42
Yes, I know that feeling.
We have some major home improvements coming up (when there is enough budget).
All the rooms on the ground floor (scullery, kitchen, living room, toilet and bathroom) are nominated....

That sounds like several months' worth right there
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DAFlys Posted at 12-1 02:50
When you get the power back this might help -

https://www.youtube.com/watch?v=swW95i3jLE8

Thanks.  Too noisy here at the moment (drilling, hammering and banging) I'll study it this evening when the work is finished for the day.
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Blériot53 Posted at 12-1 03:02
Thanks.  Too noisy here at the moment (drilling, hammering and banging) I'll study it this evening when the work is finished for the day.

These workmen are cramming your style,   I bet you wont be down the coffee shop for a while.
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DAFlys Posted at 12-1 03:03
These workmen are cramming your style,   I bet you wont be down the coffee shop for a while.

Friday might be good. The electrician should finish first fix today. Plasterer tomorrow, then Friday and the weekend for the plaster to go off before Monday's restart for the tilers.
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Blériot53 Posted at 12-1 03:16
Friday might be good. The electrician should finish first fix today. Plasterer tomorrow, then Friday and the weekend for the plaster to go off before Monday's restart for the tilers.

A day of reprieve will be nice for you.
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DAFlys Posted at 12-1 03:20
A day of reprieve will be nice for you.

If it's fine I might get a flight or two in as well - but the forecast for Friday is rain (again). Sunday looks promising though.
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Blériot53 Posted at 12-1 03:24
If it's fine I might get a flight or two in as well - but the forecast for Friday is rain (again). Sunday looks promising though.

Lows of -2 here Friday and then rain here too.
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DAFlys Posted at 12-1 02:50
When you get the power back this might help -

https://www.youtube.com/watch?v=swW95i3jLE8

Now that is a killer thumbnail.
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Blériot53 Posted at 12-1 02:54
That sounds like several months' worth right there

We will split it in sections.
First scullery and kitchen (hopefully next summer, but that is not sure)
Then save for the living room.
(going to be a big upgrade that requires stripping it down to the sand and re building everything with insulation, windows etc. etc. )

And after that the bathroom and toilet probably.
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Montfrooij Posted at 12-1 04:32
Now that is a killer thumbnail.

Yes,  that is a cracker isnt it.
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DAFlys Posted at 12-1 05:45
Yes,  that is a cracker isnt it.

One of the best I have seen in a long time.
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Montfrooij Posted at 12-1 05:46
One of the best I have seen in a long time.

Technically though shouldn't he have been using a stone to sharpen the camera.
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DAFlys Posted at 12-1 05:50
Technically though shouldn't he have been using a stone to sharpen the camera.

Probably yes, but this is more clickable.....
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Montfrooij Posted at 12-1 06:01
Probably yes, but this is more clickable.....

Yes,  it was a very clever thumbnail.
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DAFlys Posted at 12-1 06:03
Yes,  it was a very clever thumbnail.

That knife and the lighting are really good.
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Montfrooij Posted at 12-1 04:33
We will split it in sections.
First scullery and kitchen (hopefully next summer, but that is not sure)
Then save for the living room.

Quite a bit more than our small renovation
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Blériot53 Posted at 12-1 08:03
Quite a bit more than our small renovation

It is our journey
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The French have a saying:   Petit à petit. le oiseau fait son nid (bit by bit, the bird builds its nest)  
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Blériot53 Posted at 12-1 08:21
The French have a saying:   Petit à petit. le oiseau fait son nid (bit by bit, the bird builds its nest)

Sounds smart!
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