Video Transition

Hard cuts are fine until they're not. Video Transition is the node that crossfades one clip into another with FFmpeg's xfade family - plain fades, dissolves, directional slides, circle reveals, radial and pixelize transitions, and a few dozen more. It's how you join two generated clips so the seam feels intentional.

What it does

On ▶ Run it blends video_a (the outgoing clip) into video_b (the incoming one) over a transition of your choice and outputs a single COMFYTV_VIDEO. Both inputs are required - run with either missing and the node errors instead of guessing.

The controls:

• transition - pick from the full XFADE_TRANSITIONS menu: fade (default), dissolve, fadeblack, fadewhite, directional wipes and slides (wipeleft…smoothdown), reveals (circlecrop, circleopen, vertopen…), cover*/reveal*, squeezeh/squeezev, zoomin, distance, pixelize, radial, hblur. That's 57 named styles.
• duration - transition length in seconds, 0.1–5.0, default 1.0.
• offset - seconds into clip A where the transition starts; 0 (default) means auto - it places the transition at the tail of A, ending the clip. Set a real value only when you want the transition to begin earlier inside A.

Choosing well

The honest guidance: 90% of the time a fade or dissolve is the right answer, and the exotic wipes read as motion graphics, not filmmaking. The directional wipes and cover*/reveal* family earn their keep in montages and title sequences; pixelize and radial are the "stylized reveal" options for AI-video work where you want the transition to feel generative. If you want a gradient wipe - a shape sweeping across based on a grayscale pattern - that's a different node, Luma Wipe, which supports custom luma images. For assembling many clips with per-cut transitions in one node, the pack's Sequence stage does it at scale.

Install and troubleshooting

Pack-standard: git clone https://github.com/jtydhr88/ComfyTV into ComfyUI/custom_nodes, restart, under ComfyTV → Compose. No models, no GPU - PyAV xfade pass.

• Run errors "needs two upstream videos" - one of video_a/video_b is unwired or wasn't run. Both must hold snapshots.
• Transition looks off - check duration (a 1s transition on a 3s clip is a big fraction) and whether offset is pulling the start into the middle of A when you wanted the tail.
• Wanted a gradient/custom wipe - that's Luma Wipe, not this node.

Output is a COMFYTV_VIDEO snapshot; cross to native ComfyUI nodes with a ← ComfyTV Video Bridge.