Add model card README

README.md

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+---
+license: mit
+tags:
+  - whisper
+  - speech-recognition
+  - transcription
+  - comfyui
+  - ffmpega
+---
+
+# OpenAI Whisper Models
+
+Mirror of [OpenAI Whisper](https://github.com/openai/whisper) model weights in **safetensors** format, hosted by [AEmotionStudio](https://github.com/AEmotionStudio) for use with [ComfyUI-FFMPEGA](https://github.com/AEmotionStudio/ComfyUI-FFMPEGA).
+
+## Available Models
+
+| File | Size | Parameters |
+|:-----|:-----|:-----------|
+| `tiny.safetensors` | ~72 MB | 39 M |
+| `base.safetensors` | ~139 MB | 74 M |
+| `small.safetensors` | ~461 MB | 244 M |
+| `medium.safetensors` | ~1.5 GB | 769 M |
+| `large-v3.safetensors` | ~2.9 GB | 1550 M |
+
+**Original source:** [OpenAI Whisper](https://github.com/openai/whisper) (Azure CDN)
+
+## Format
+
+Models are stored in `.safetensors` format for security. The `dims` configuration metadata is preserved in each file's safetensors header. ComfyUI-FFMPEGA automatically handles the conversion to `.pt` format locally when downloading from this mirror.
+
+## Usage
+
+These models are automatically downloaded by ComfyUI-FFMPEGA when audio **transcription** or **subtitle generation** is used. No manual setup is required if `allow_model_downloads` is enabled on the FFMPEG Agent node.
+
+### Manual Installation
+
+1. Download the desired `.safetensors` file from this repo
+2. Convert to `.pt` or place in `ComfyUI/models/whisper/`
+3. FFMPEGA will detect the local file and skip downloading
+
+## Why This Mirror?
+
+This is a first-party mirror maintained by AEmotionStudio to ensure supply chain resilience. If OpenAI's CDN becomes unavailable, FFMPEGA will still be able to download models from this mirror.
+
+## License
+
+OpenAI Whisper is released under the MIT license.