3cdxcwxu_720p.mp4

: MP4 is a "wrapper." If the video fails to play, it might be due to a specific codec (like H.264 or HEVC) used inside that your player doesn't recognize, though this is rare for standard 720p files. MP4 files explained: How to open and use - Adobe

: This indicates the video is in High Definition (HD) , specifically measuring 1280 x 720 pixels . The "p" stands for progressive scan, meaning every line of each frame is drawn in sequence, resulting in smoother motion compared to interlaced video. 3CdxCwXU_720p.mp4

: You can open this file using standard media players such as VLC Media Player , Windows Media Player, or QuickTime . : MP4 is a "wrapper