This happens on Windows when the video was recorded in "High Efficiency" (HEVC) mode. You can change this in your iPhone settings under Settings > Camera > Formats to "Most Compatible" for future videos. 4. How to Convert IMG_2033.MOV to MP4

Double-click to open in QuickTime Player or Photos .

Use the VLC Media Player or the PotPlayer . Windows Media Player may require a "HEVC Video Extension" from the Microsoft Store to play newer iPhone videos.

Use HandBrake , a free, open-source tool that handles batch conversions safely. 5. Identifying the Content

Modern iPhones usually record in H.264 or HEVC (H.265) .