Hi. I’m using Shotcut 20.07.11 on Linux, which is generally working well.
Part of the edit I’m working on is a screencapture, with some details I wish to cover, to only show the action in letterbox format.
Consequently I’m attempting to make a simple shape mask on a colour, with the operation set to “subtract”. The colour is the top track on the timeline, but I can find no way of using the black colour I have selected to mask (in subtractive or overwrite mode) the track below. The selected clip in the screenshot below is the colour element I am attempting to use as a mask.
Thank you for the wonderfully clear instructions, @sauron.
However, after removing the track 4 filters and adding a new black colour with opacity and masking, I still see solid black.
I made a transparent colour to see how filters might work with that, but it is still showing up as solid black, so I seem to have some sort of issue with transparency in general.
I am seeing an error log which may be related:
[Warning] <> file:///...Shotcut.app/share/shotcut/qml/filters/mask_alphaspot/ui.qml:223: TypeError: Cannot read property 'animateIn' of null
This composite image shows (top) the video below showing fine and (bottom) once the timeline hits the simple colour + mask and opacity that it only shows black. No amount of fiddling on the filter settings help.