Working with Workflow Utilities
These are the steps that glue a workflow together on each::labs. The family spans an HTTP call step for reaching external services, FFmpeg-backed video merging, scaling and auto subtitling, a long tail of image utilities (crop, background editing, hairstyle, product shoot, face swap, NSFW detection), PDF and YouTube text extraction, RVC voice-clone training, and ACE-Step 1.5 text-to-music.
When to choose Workflow Utilities
Use these when a pipeline needs plumbing and small transformations between generative steps — a request to your own API, a crop before an edit, subtitles after a render. They are utilities rather than flagship creative models.
Choosing between the variants
HTTP Call reaches an external endpoint from inside a workflow. Scale Video, Crop Image and the post-processing steps prepare media. Merge Videos concatenates clips and Auto Subtitle captions them. Train RVC produces a voice model, and ACE-Step 1.5 generates music with vocals from a prompt.
About Workflow Utilities
- What is the HTTP call step for?
- Calling your own or a third-party API from inside a workflow, so a run can fetch data or trigger a service between generative steps.
- Can Auto Subtitle match my brand styling?
- Yes. It turns the video’s audio into captions styled with your chosen fonts and colours rather than a fixed default look.
- Is there a music model in this family?
- Yes — ACE-Step 1.5 is a diffusion and language model system that generates music with vocals from a prompt and optional custom lyrics.

