: Formally known as ISO/IEC 14496-14, it is an open international standard, unlike proprietary formats like Apple's .MOV . Common Issues

If you are encountering a file named "6703mp4" and it will not play, it is likely due to: Popular Types of Video File Formats - Adobe

MP4 files—the category "6703mp4" falls into—are favored for their balance of high quality and small file size.

: High Efficiency Video Coding (HEVC/H.265) or H.264. Audio Codec : Advanced Audio Codec (AAC).