align_audio

Packages

chatterbox
- chatterbox Reference
compost
cornfab
- cornfab Reference
diffuseR
earshot
- run_app
fyi
- fyi Reference
llamaR
- llamaR Reference
rapt
- rapt Reference
rformat
- rformat Reference
saber
- saber Reference
stt.api
tinypkgr
- tinypkgr Reference
tinyrox
- tinyrox Reference
tts.api
- tts.api Reference
whisper

Locate a clip’s audio within a longer narration

Description

Normalized cross-correlation of amplitude envelopes (10ms resolution by default): returns the offset in seconds at which clip’s audio best matches narration. Works on video files (their audio stream) and plain audio files alike.

Usage

align_audio(clip, narration, sr = 8000L, hop = 80L)

Arguments

clip: Media file whose audio to place.
narration: The continuous reference audio (e.g. the track’s audio.mp3).
sr: Decode sample rate (default 8000).
hop: Envelope hop in samples (default 80 = 10ms at 8kHz).

Value

Offset in seconds (numeric), with attributes correlation (peak normalized correlation, 0-1ish) and curve (correlation per candidate lag).

Examples

align_audio("media/chunk02.mp4", "audio.mp3")