The _source suffix indicates that this is the original, high-quality master file before any compression or transcoding for different devices (like 720p or 1080p versions) has occurred.
Systems like Kodi or Plex use these IDs to pull correct metadata (descriptions, posters, etc.) from databases like TMDB. 0h9gq5k9jlj6zcmv4q8pe_source.mp4
The use of underscores ( _ ) instead of spaces is a best practice for cross-platform compatibility, preventing errors when files are handled by different operating systems or web servers. Why This Convention is Used The _source suffix indicates that this is the