Some CCTV and DVR systems use proprietary alphanumeric strings to timestamp or categorize motion-detected clips.
The "Swiss Army Knife" of video. It has built-in decoders for almost any subsampling or bit-depth configuration. 42211mp4
Provide a few more details and I can help you find the exact software it originated from. Some CCTV and DVR systems use proprietary alphanumeric