ISM Downloader

A Python-based tool for downloading and reconstructing media from Microsoft Smooth Streaming (ISM) manifests. The project parses the manifest, retrieves media fragments, and rebuilds a valid MP4 file with proper PIFF headers and DRM-related metadata.

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Features

• Parses Smooth Streaming (ISM) manifests
• Downloads and reconstructs video and audio tracks
• Generates valid MP4/PIFF initialization segments
• Supports DRM metadata (PlayReady / Widevine PSSH)
• Automatic bitrate probing for better track selection
• Interactive track selection

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Requirements

• Python 3.9+
• requests
• inquirer (optional, for interactive menu)

Installation:

pip install requests inquirer

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Usage

python ism_downloader.py

Then provide the manifest URL when prompted.

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Notes

This project was developed primarily as a personal initiative to better understand Smooth Streaming (ISM) and MP4 structure. Some features were added to expand the scope of the project beyond its initial purpose.

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Issues and Support

If you encounter any issues, please open an issue in the repository. Support and maintenance will be provided as time permits.

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Acknowledgements

Thank you for your interest in this project.