Infill (Bytes)

Generate audio that smoothly connects two existing audio segments. This is useful for inserting new speech between existing speech segments while maintaining natural transitions.

The cost is 1 credit per character of the infill text plus a fixed cost of 300 credits.

Only the sonic-preview model is supported for infill at this time.

At least one of left_audio or right_audio must be provided.

As with all generative models, there’s some inherent variability, but here’s some tips we recommend to get the best results from infill:

• Use longer infill transcripts
  • This gives the model more flexibility to adapt to the rest of the audio
• Target natural pauses in the audio when deciding where to clip
  • This means you don’t need word-level timestamps to be as precise
• Clip right up to the start and end of the audio segment you want infilled, keeping as much silence in the left/right audio segments as possible
  • This helps the model generate more natural transitions