Blackmagic Forum

This happens only in BETA version 8.
i have 1 clip. I copy this clip over the first one, so i have 2 similar clips over each other.
The playback works fine.

When i crop the clip above the playback bugs.
The playback gets overexposed (extremly bright) and is starting to lag (no smooth playback anymore)

Is this only happening to me? Or is the issue reproducible at your systems?

there are other bugs with cropping in the latest beta 8
the softness cropping bug! all of a sudden, the softness parameter does this to images?!

There are definitely some bugs with cropping in 17.0b8. For me, cropping is ignored during playback. This makes all of my footage overlap in an additive manner. When stopped it is fine.

I'm seeing a similar issue on a 2019 Mac Pro DR Studio 17 Beta 8. I placed a clip on top of an identical clip, the only difference being the top clip contains graphics. I key framed a reveal of the graphics using cropping and a thin white line appears at the cropped edge. When rendering the image flashes becoming overexposed. Reinstalling Beta 7 fixed the problem.

Hello,
I have the same problem also only with 17.0B Build 27
Even with already finished projects!
PC: WIN10 64GB RAM, NVIDIA Quadro P2000 V461.40

Best Regards,
Ingmar

Same here - it seems it's a new bug in beta release 8. It showed up in a project I just completed with DR17 beta release 7 without cropping issues.

In short, cropping flickers or is ignored in the timeline, and ignored on render.

I had a similar issue when cropping that at playback it would show the cropped area but as translucent.

I have found a workaround, that by setting the composite mode to inverted lum this no longer happens.

+++

Same issue - which coincided with updating to latest Beta. I rendered the video out earlier, all cropping is OK. After updating DaVinci Resolve, cropped videos now show a ghosted border of what was cropped. Condition is present during preview playback (Cut or Edit page) and after rendering.

I have this BUG too. See Aaron's workaround. It worked for me too. YAY for Aaron.

temporaly decision is using composite mode=alpha

puhovik wrote:temporaly decision is using composite mode=alpha

I'm having the same problem too and this work around works fine

puhovik wrote:temporaly decision is using composite mode=alpha

You saved me. Thank you good sir

I literally just created a post about this. I should have read this thread first.

Changing composite mode to "alpha", as I just read here also solved my issue.

Thanks!

Yeah, I searched the forums before starting a thread about this, didn't come up with anything, then wrote a whole post about it. Now, I see that this thread is about a week old, so deleted mine, and am putting my +1 here.

Changing composite mode to alpha doesn't seem to work for Color managed projects.

Also, is the "Retain Image Position" checkbox new? I never noticed it before, but it doesn't seem to do anything.

Jason Conrad wrote:is the "Retain Image Position" checkbox new?

In 17, yes. Under Help>Reference Manual a New Features guide will open explaining all the new stuff.

Jim Simon wrote:

Jason Conrad wrote:is the "Retain Image Position" checkbox new?

In 17, yes. Under Help>Reference Manual a New Features guide will open explaining all the new stuff.

The new features guide does not cover this topic, but I figured it out. It doesn't do anything unless you've adjusted the images position coordinates. In such a case, it works like "pan behind" in Adobe products. I was expecting it to work more like Fusion's Crop node. Handy little addition, though.

Try Beta 9. This is in the update notes.

Looks fixed to me in b9

In Beta 9 it is only partialy fixed:
Correct behaviour when cached. Without cache it still produces jagged rounded edges.

Oh yeah you're right:

(1) If you change the crop dimensions, some dimensions will look fine, and other will not (either black or white border showing). Changing by 1 pixel will change, and some will look fine.

(2) If you have rotation applied, then you will inevitably hit some of the "bad" at some point in the edge line.

See the slightly angled image bottom border where you see black jagged and on the side you see white jagged :

When using soft edges, the blend still appears additive in B9, cached or not, but at least it doesn't flicker now.

I was hopeful that Beta 9 would fix this, but I still experience issues with Softness. The softer you make it, the more it "smears" for me, but even at 1 I get a black bar.

This is a freeze frame of Prorez 422 on top of the clip with color correction applied ... though, when I removed the color correction, the smearing still existed:


Hope that helps as the team works to address it.

~Luke

It's fine until I apply softness, then I get a white line at the edge of the crop. Even if I reset it to zero softness, the white line remains. Much better than it was but still not completely fixed.

I'm getting a white 1 pixel line around the crop without softening. With softening, it is like before with a light overlay-like appearance at the crop. Hoping beta 10 will address

I also noticed that when using softness, when you crop, the softness goes away and it becomes a hard line. I believe this started in 17rev8.

Hopefully this gets fixed as it is unusable at this point.

I'm on beta 9 and still getting strange result with crop.

I made window in Colour, add alpha output and fed the window to the alpha out. On the Edit Page the crop only crops the RGB not the alpha so I'm left with black where it's cropped but the same alpha from the window. I can make this into a Compound clip, the alpha carries through and the crop behaves as you'd expect.

still a problem (or is it the way it's supposed to be now?) in the new formal release of DR17

17 is out of beta and they seem to have fixed the cropping issue. Great work on this release!

I realised that my complaint (above) about the crop not cropping an alpha made on the colour page is slightly different issue and probably to do with the order of operations edit page > colour page. Still not working in an ideal way though. It's either the alpha from edit, modified with the crop, OR the alpha from the color page, it should be AND I guess?

Still buggy in 17.1

Exactly the same results as I posted above in : viewtopic.php?f=21&t=133484#p725362

Actually my bad, the behavior changed.

I still had the "old" work around of having the alpha output added in the color page and with that active, it's still buggy same behavior as before (which AFAICT it should work, so that's also an issue ...)

If I remove the alpha output in the color page, then the only issue I can see that remains is that if an edge is not cropped (so it goes right to the edge of that image), then there is a thin black border on that side, and if you apply a rotation, it becomes very visible and jagged. (just like the pic in my post above on the lowest edge)

It's also dependent on the resize I apply to the image.