Another angle: Could "hindimp4" be a specific website, tool, or service they're referring to? Let me check. There's a site called hindimp4.com, which might be related to downloading Hindi MP4 content—like movies? So the user might be looking for a write-up about the best MOBI versions of content from hindimp4.com. But MOBI is for books, so converting movie data to MOBI isn't practical. Maybe they want information on how to access or download Hindi MP4 content via a mobile-friendly website (mobi), and "best" implies the best resources or methods.