Combine Videos

The Combine Videos node joins two or more video clips into one video, in the order you set. Between the clips it can place a hard cut or one of more than 50 transitions, blend the sound with an audio crossfade, and trim the duplicated frames that AI continuation clips share at their seams. Use it to assemble generated shots into a sequence or a finished edit.

When to use it

• Assemble generated clips into one sequence.
• Join several image-to-video results into a longer video.
• Build a montage from different generation nodes.
• Join clips that continue each other without a visible jump, with the Seamless Join (One-Shot) preset.
• Build a perfect loop: combine a clip with itself, then add a soundtrack with Merge Video & Audio.

Quick start

Inputs

The output, Video, is the single combined video.

Settings

Transitions

The transition picker in the settings panel has more than 50 transitions. Each tile shows a looping preview, so you can compare them at a glance. The Common tab holds the ones used most:

The other tabs group every transition by family:

Sound between clips

With Audio set to Crossfade, the sound blends at every join. The crossfade never changes the picture: its duration and curve shape only the sound.

• At a hard cut (Cut, or any transition with a duration of 0), the picture switches instantly and the sound makes an L-cut. The next clip's sound starts exactly on the cut and fades in. The previous clip's sound continues for the crossfade duration past the cut and fades out. That lingering tail is stretched by a few percent, with the pitch kept, and the fade hides the stretch.
• At a blend transition (Fade, Dissolve, the wipes and the others), every clip's sound stays in sync with its picture. The sound blends over the transition. A crossfade longer than the transition extends the blend gently into both clips.
• The last clip is never faded out. Its sound plays to the very end of the video.

Every clip is converted to a common format before the join, so clips from different models always splice cleanly. When some clips have sound and others are silent, the silent clips get a silent track, so the combined soundtrack never drops out.

Crossfade curves

Trim the seams

AI continuation clips, where each clip starts from the previous clip's last frame, usually stutter at the seam. The model renders a nearly identical moment on both sides of the join. Boundary cut removes that duplicate in one of two ways.

Manual

Manual removes a fixed number of frames on each side of every join: Trim each clip end (frames, except last) and Trim each clip start (frames, except first). The first clip's start and the last clip's end are never touched. The same trims apply to every join, which suits clips that all end with the same fixed-length dissolve.

Smart

Available on Nodaro Cloud

The Smart methods run on Nodaro Cloud only. Self-hosted Community and Business editions offer the Manual method, and the API returns cloud_only_feature if Smart cut is requested there.

A Smart method compares the last frames of each clip with the first frames of the next clip, within the two search windows, and places the cut for you. Every join is searched on its own, so a video of 3 clips has 2 independent joins.

• Only a real match counts. Frames count as a match only when they are close enough to be the same moment. The pre-roll methods also need a run of matching frames, not one isolated pair.
• Joins without a match use the default trims. A join where no match is found, for example between clips that do not continue each other, falls back to 1 frame from the start and 2 frames from the end. Your own Manual trim values are reset when you switch to a Smart method, so nothing hidden changes the fallback.
• Speech is not clipped. With Audio set to Crossfade and a hard cut, a matched join trims only the previous clip's picture. Its real sound keeps playing under the start of the next clip and fades out over the crossfade duration. Unmatched joins, the Manual method, Keep original or Remove audio, and blend transitions trim picture and sound together.
• Out-of-range windows are corrected. A window value outside 1 to 24 is moved to the nearest allowed value, for example 48 becomes 24 and 0 becomes 1. A value that is not a number falls back to 8. The run is never refused for this.

Presets

The Joins & Transitions folder in the node's preset menu has five presets:

Seamless Join (One-Shot) removes the jump you see when you join continuous shots, such as start-and-end-frame storyboards or a clip extended with Extend Video. Those clips share a nearly identical frame at the join, which reads as a hitch. The preset keeps a hard cut, so the result still looks like one continuous take, and hides the sound seam with an equal-power crossfade. Connect your clips in order and run.

Credits

Combine Videos is priced by the estimated length of the output, in steps of 5 seconds. The estimate adds up the clip lengths, then subtracts the transition overlaps and the frame trims. Each clip beyond the first two adds one more step, and the minimum is one step.

The Run button shows the live estimate. A connected clip that has not been generated yet counts as 8 seconds.

Tips

• Fade for most joins. A 0.5-second Fade looks clean between most clips. Use Cut for fast-paced edits or for clips that should look like one continuous shot.
• Keep transitions short for social media. 0.3 to 0.5 seconds keeps the pace up.
• Dip to black between scenes. Dip to Black works well between scenes with different places or moods.
• Blend the sound, not the picture. An audio crossfade of 0.5 to 1 second smooths an ambient soundtrack across a hard cut without touching the picture.
• Drop VEO tail dissolves everywhere at once. When every clip ends with the same dissolve, set Trim each clip end (frames, except last) to remove it from all of them.
• Add music afterwards. Connect the combined video to Merge Video & Audio to add a soundtrack.

From the API

POST /v1/combine-videos and the MCP combine_videos tool join clips with the same options. When a Smart method runs, the job result lists every join with the trims that were applied, the similarity score and whether a match was found. See Run a single node and the MCP tools.