First off, thanks for the replies! I’m very grateful you even replied.
And I tried everything you all said, but it didn’t change anything. And for everything that follows
- I’m using cycles.
- I set the video’s Material Properties → Viewport Dispaly → Settings → Blend and shadow modes both to Alpha Clip.
- Turned the light paths max bounces all the way up to 5+ for everything. Even though there’s nothing that would get in the way to prevent light from passing through, etc
- Set Light paths → Clamping both to 0.
- Set the alpha in my video’s node in the Shading tab’s N-panel to both Straight, and Premultiplied.
But nothing stops this black line from appearing.
And as for Okidoki’s suggestion, this is the node structure I set, but nothing worked either:
- my_video’s color → PrincipledBSDF emission
- my_video’s alpha → MixShader’s Fac
- Transparent BSDF → MixShader’s top shader
- PrincipledBSDF → MixShader’s bottom shader
- MixShader → MaterialOutput’s surface
Any ideas? Need some more info?