Many security cameras and dashcams save clips using a four-digit numeric string based on the timestamp or sequence.
Use a tool like FFmpeg to check if the file is corrupted. Run ffmpeg -i 7221.mp4 in a terminal to see the metadata and stream info. 7221mp4
If you are a developer using BorgBackup , issue #7221 refers to a "Data integrity error" where a segment entry header is invalid. This typically requires checking your repository integrity or upgrading the software. Many security cameras and dashcams save clips using