Sun Aug 18, 2019 10:41 am
I had this same problem
just from some playing around, I added an adjustment layer above the clips I had blanking fill applied and changed the composite mode of that adjustment layer to Color Dodge.
Subtitles and other video clips above the adjustment layer no longer affect the blanking fill effect applied below the adjustment layer.
The blanking layer didn't work as I thought it would but this 'hack' produced the desired result, for me anyways
macOS 12.2.1, 3.7GHz Intel Core i7, 64G DDR4 Ram, Radeon 8G RX580 GPU, 250/500Gb SSD storage, Synology 920+ 8T NAS