So Mahmp4 ◎

You’ll typically find these in a specific folder on your SD card, often labeled 100ANV01 or similar, separate from the high-res "Private" or "M4ROOT" folders.

These are standard proxy or "normal" resolution video files created alongside high-quality footage. Sony cameras (like the RX10, A77, or Alpha series) often generate these for specific reasons: so mahmp4

They are much smaller in size (e.g., ~32MB vs ~200MB) compared to primary formats like AVCHD or XAVC S. You’ll typically find these in a specific folder

Their lower bitrate makes them ideal for quickly transferring to a smartphone via Wi-Fi for social media posts. Their lower bitrate makes them ideal for quickly

If you want to know how to these or link them as proxies in a specific editor, just let me know which software you're using.

If your editing software (like Lightroom ) says "Preview unavailable," it may be struggling with the Sony metadata folder structure rather than the file itself.