How to Generate AI Captions Locally in Premiere Pro

Adding captions to videos is no longer optional. Platforms prioritize captioned content in their algorithms, a significant portion of viewers watch without sound, and accessibility standards increasingly require it. The question is not whether to caption — it is how to do it efficiently without relying on slow, expensive transcription services.

The Problem With Cloud-Based Captioning

Most captioning workflows involve uploading your video or audio to a cloud service, waiting for processing, downloading the result, importing it into your NLE, and then spending time fixing inaccuracies. Depending on the service, you are dealing with:

• Upload and processing time. A 30-minute video can take 10-15 minutes to upload and another 10-15 minutes to process.
• Privacy concerns. Client content, unreleased footage, or sensitive material needs to leave your machine and sit on someone else's server.
• Cost. Professional transcription services charge per minute of audio. At scale, this adds up quickly.
• Round-trip friction. Downloading an SRT file, importing it into Premiere Pro, and syncing it to the timeline adds manual steps to every project.

Running Whisper AI Locally

The AI Captions tool in the SmoothyEdit desktop plugin runs OpenAI's Whisper model directly on your machine. Nothing is uploaded. The audio is processed locally, and the results go straight into your workflow.

What this means in practice:

• No upload wait. Processing begins immediately. For most videos, results are ready within a few minutes.
• No privacy risk. The audio never leaves your computer. This matters for client work, NDA content, and unreleased projects.
• No per-minute cost. The tool is included with the SmoothyEdit desktop plugin. There are no additional transcription fees.
• Word-level timing. Whisper produces timestamps for individual words, not just sentence-level chunks. This enables precise caption alignment and animated text effects.

The Workflow

Using AI Captions is straightforward:

1. Open the SmoothyEdit extension panel in Premiere Pro (Window → Extensions → SmoothyEdit).

2. Select your sequence or audio track. The tool analyzes the audio from your active sequence.

3. Run the caption generation. Whisper processes the audio locally. Processing time depends on your hardware and the length of the content, but most videos under 30 minutes complete within a few minutes on modern machines.

4. Review and export. Once processing is complete, you can:

• Export as SRT — the standard subtitle format compatible with YouTube, Vimeo, and virtually every video platform.
• Apply directly to your Premiere Pro sequence — captions appear as a caption track on your timeline, already synced to the audio.

Accuracy and Editing

Whisper's accuracy is generally strong for clear speech in common languages, but no automatic transcription is perfect. You should expect to make corrections for:

• Proper nouns. Names of people, brands, and places are the most common error category. The model may produce phonetically similar but incorrect spellings.
• Technical jargon. Industry-specific terminology may be misinterpreted if it is not common in the model's training data.
• Overlapping speech. When multiple people talk simultaneously, accuracy drops significantly.

A typical editing pass on Whisper output takes 5-10 minutes for a 20-minute video, which is still significantly faster than transcribing from scratch or fixing a lower-quality automated service.

When to Use Local vs. Cloud Captioning

Local captioning through the SmoothyEdit plugin is the better choice when:

• You process captions frequently and want to avoid per-minute costs
• You are working with confidential or unreleased content
• You want captions applied directly in Premiere Pro without an import step
• You need word-level timing for animated caption effects

Cloud services may still be preferable if you need captioning in languages that Whisper handles less accurately, or if you require human-verified transcription for legal or broadcast compliance.

Getting Started

AI Captions is part of the SmoothyEdit desktop plugin for Premiere Pro and is available on the free tier. Download the plugin from the Premiere Pro Plugin page. The only requirement is a machine capable of running local AI inference — any modern Mac or Windows PC with a dedicated GPU will handle it comfortably.