Video Add Audio

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This block allows you to attach a separate audio track to a video file, replacing or combining with the original audio.

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Add Audio To Video

What it is

Block to attach an audio file to a video file using moviepy.

How it works

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The block uses MoviePy to combine video and audio files. It loads the video and audio inputs (which can be URLs, data URIs, or local paths), optionally scales the audio volume, then writes the combined result to a new video file using H.264 video codec and AAC audio codec.

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Inputs

Input	Description	Type	Required
video_in	Video input (URL, data URI, or local path).	str (file)	Yes
audio_in	Audio input (URL, data URI, or local path).	str (file)	Yes
volume	Volume scale for the newly attached audio track (1.0 = original).	float	No

Outputs

Output	Description	Type
error	Error message if the operation failed	str
video_out	Final video (with attached audio), as a path or data URI.	str (file)

Possible use case

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• Adding background music to a silent screen recording
• Replacing original audio with a voiceover or translated audio track
• Combining AI-generated speech with stock footage
• Adding sound effects to video content

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