Hi! From what I understand, video-downloads.googleusercontent.com URLs are associated with Google's video delivery infrastructure, but the exact mechanism used by third-party services may vary.

Google Drive's preview player may obtain media URLs through internal playback mechanisms, but these endpoints are not necessarily part of the public Google Drive API and may change without notice.

For a supported implementation, I'd suggest investigating these options:

• Google Drive API: Use files.get with alt=media to retrieve file content when authorized.
• Google Picker and OAuth: Let users select files they own or have permission to access.
• HTTP Range requests: Check whether the supported download endpoint allows partial content requests for resumable downloads.
• Temporary URLs: Treat media URLs as potentially expiring and avoid relying on undocumented endpoints for production systems.

One important distinction is that a URL returned by Google's video playback system may be a temporary, session-specific media URL rather than a permanent download link. Its availability, authentication requirements, and Range request support can vary.

I'd also be interested in any documented research or open-source implementations that explain the playback URL generation process without depending on undocumented internal endpoints.

Hey there! 👋

Thanks for posting in the GitHub Community, @kelvinsoft1 ! You are more likely to get a useful response if you are posting in the applicable category. The Apps, API and Webhooks category is a place for our community to discuss and provide feedback GitHub's APIs and webhooks. GitHub provides two APIs: a REST API and a GraphQL API. Webhooks allow you to build or set up integrations, such as GitHub Apps or OAuth Apps, which subscribe to certain events on GitHub.com

I've gone ahead and moved this to the correct category for you. Good luck!