Video Concat

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This block merges multiple video clips into a single continuous video, with optional transitions between clips.

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Video Concat

What it is

Merge multiple video clips into one continuous video

How it works

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The block uses MoviePy's concatenate_videoclips function to join multiple videos in sequence. It supports three transition modes: none (direct concatenation), crossfade (smooth blending where clips overlap), and fade_black (each clip fades out to black and the next fades in). At least 2 videos are required. The output is encoded with H.264 video codec and AAC audio codec.

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Inputs

Input	Description	Type	Required
videos	List of video files to concatenate (in order)	List[str (file)]	Yes
transition	Transition between clips	"none" | "crossfade" | "fade_black"	No
transition_duration	Transition duration in seconds	int	No
output_format	Output format	"mp4" | "webm" | "mkv" | "mov"	No

Outputs

Output	Description	Type
error	Error message if the operation failed	str
video_out	Concatenated video file (path or data URI)	str (file)
total_duration	Total duration in seconds	float

Possible use case

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• Combining multiple clips into a compilation video
• Assembling intro, main content, and outro segments
• Creating montages from multiple source videos
• Building video playlists or slideshows with transitions

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