To help you better, could you tell me or what software you are using?
If the file size is 0 bytes or significantly smaller than expected (e.g., KB instead of MB), the download likely failed or the source file is corrupted. Download download Background 9584(0)(0) mp4
If the file won't open, VLC Media Player is more capable of playing partially corrupted or unusual MP4 files than standard players. To help you better, could you tell me