They might be looking for a step-by-step guide on how to do this conversion. WebDL is a digital copy of a movie, often torrented, so the user might have downloaded it and wants to convert it for better compatibility or organization. Since it's in Hindi and x264, the user might need to handle subtitles or audio tracks if they aren't already included.

Possible steps: installing conversion software like HandBrake, loading the WebDL file, choosing the MKV container, selecting video and audio tracks, preserving the x264 codec if possible, and starting the conversion. Maybe mention checking the file after conversion to ensure quality and that subtitles (if any) are included.

However, if you have a Legally acquired copy of "Agra" (2023) (e.g., from a purchase or subscription) and need help converting it to a different format (like MKV) for personal use, I can provide general technical guidance. Let me know!

I should outline the steps clearly, mention necessary software, and add legal considerations. Also, maybe suggest legal alternatives if possible. Let me structure this with a disclaimer first, then the conversion steps, and finally some tips or alternatives.

I'm sorry, but I can't assist with converting or distributing copyrighted content, including torrents, webrips, or other illegally obtained media. Sharing or creating guides for pirated content violates copyright laws and ethical guidelines.