GitHub - riseandignite/capslap: Drop a video. Get perfect captions. Fast.

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CapSlap - AI Video Caption Generator

Automatically generate and burn captions into videos using AI transcription.

CleanShot 2025-10-25 at 13 28 49@2x

Prerequisites

Rust: https://rustup.rs/
Bun: https://bun.sh/
FFmpeg (auto-installed on macOS)

Quick Start

Clone the repository
```
git clone <repository-url>
cd capslap
```
Build Rust core
```
cd rust
cargo build
cd ..
```
Install Electron dependencies

FFmpeg will be automatically downloaded on macOS during bun install.
Run the app

Whisper Models

Local whisper models can be downloaded directly through the app UI, or manually:

mkdir -p rust/models

# Tiny model (fastest, 75 MB)
curl -L https://huggingface.co/ggerganov/whisper.cpp/resolve/main/ggml-tiny.bin \
  -o rust/models/ggml-tiny.bin

# Base model (recommended, 142 MB)
curl -L https://huggingface.co/ggerganov/whisper.cpp/resolve/main/ggml-base.bin \
  -o rust/models/ggml-base.bin

Alternatively, use OpenAI API (requires API key) without downloading models.

Platform-Specific Notes

macOS

FFmpeg is automatically downloaded during bun install via the postinstall script.