Since this specific alphanumeric string appears to relate to adult content distribution, detailed "guides" for these specific files are typically hosted on dedicated forum sites rather than general search engines. General Guide to Handling "Repack" Files
It looks like you’re asking for a research-style paper or technical analysis on the string: jufe570engsub convert015936 min repack
Check if they are "hardcoded" (burned into the image) or "softcoded" (selectable in the player menu). To help you get the best viewing experience, I can look up: The best media players for handling high-bitrate repacks. The difference between H.264 and H.265 storage. How to fix subtitle sync if your version is lagging. Since this specific alphanumeric string appears to relate