Block/obscure a small part of video

Hi,

I know this has been asked a few times here and the information given was excellent!

Basically, I have a video clip where I want to use an overlay to hide a car license plate.

I am already doing this using the: Simple Shape Filter, Mosaic, Filter Apply
method which is absolutely fine for when the license is large.

However, I have recorded video in 4k and there is a sequence where the licence is still visible using the mosaic method. I have tried to look at things frame by frame but it is becoming a little difficult as I think the mosaic isn’t blocking the information since it’s too small.

Currently I have 2 questions:

  1. is there a way to zoom into the video in the Project window?
    I don’t mean to use a filter to zoom the video but instead, zooming the ‘preview’ similar to that used in still photography in order to edit details?

  2. I am looking at this method of perhaps using a solid color instead to block the license:
    Covering parts of a video - #10 by sauron

but that requires a “color clip”… I didn’t really understand that? Does it mean that I need to create an image with the same dimensions with solid fill color as the video and overlay that onto the image using a second track?

I wonder if I’m going about this the right way? Currently I have lots of key frames to try to mask the license plate as the camera movement isn’t exactly in one direction and continuous and I’m still seeing parts of the license after exporting…

In some places I’m having to add keyframes at ever 01 tenth of a second basically.

It’s not too much of a problem, just lots of ‘extra’ work and a little laborious but achievable still.

Hi @kayasaman

1- Zoom the Player:

2- Create a Color clip:

2 Likes

Thank you!

I will try this and hopefully it will work a little better then the mosaic for the smaller dimension of the plate…

Make sure you reduce de Softness to 0 in the Mask filter.

Also, try to reduce the Width and Height values in the Mosaic filter

Width and Height at 2.5 % (default value)

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Width and Height at 0.8 %

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1 Like

That’s where I went wrong!

I went the other direction, as I guess I misunderstood what I was doing…

That really helps a lot :slight_smile: :slight_smile:

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I’m trying now with a mosaic width and height of 0.1 and zoomed into 100% and seems to be working…

Too many “key frames” though unfortunately but that’s just the nature of things when walking together with a camera

One more question…

Is there a way to move the zoomed area??

I am zooming in to 100% but it only seems to zoom the center… I have tried dragging and using ctrl+click to drag but that doesn’t work

Is it possible to do this?

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I didn’t see those bars duh… :roll_eyes:

Thanks!!

Strange thing with the mosaic Width and Height options… they keep jumping to different values after I change them?

If I set them to say 0.3% each then save and re-click on the filter they will be at something like 0.3 and 0.1 or so… is this normal behavior or am I doing something wrong?

That doesn’t sound like normal behavior. And I wasn’t able to reproduce it.

Can you list the exact steps that leads to that problem?
You just mention "save and re-click on the filter ". I did that, but the values stays the same in my project.

I think there are two issues which are a bit odd…

So the first one is if I click on the Mosaic filter with the “keyframes” parameter enabled for both height and width and type in a value, say 0.3 in the height portion.
Automatically the value will change to something 3.4%?? The numbers seem to be random.
It might be down to where I click though I am clicking on the text so it shouldn’t adjust the level bar at all…

It might be something to do with the “keyframes” being used before and after, I’m not sure.

The second issue is as described above.

I change the value from say 0.1%/0.1% to 0.3%/0.3% and save the project.
When I go to the same keyframe again, it displays something 0.2%/0.3% or 0.1%/0.3%.

I’m using version 24.04 on Arch Linux (from repositories) with Qt version 6.7.0

As a test, could you try to download the official build from our website? I recommend the portable tar.

Let us know if you still see the problem with that build.

Sorry for taking so long with this.

Here’s the first bit of similar behavior to my distro’s version…

When I check or un-check “use proxy” Shotcut seems to segfault.

Both versions exhibit this behavior.

I will keep exploring other quirks as I go…

Second issue with the portable binary…

I cut a clip and again Shotcut segfaulted :frowning:

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