For advanced users, query a public indexer API. Look for files where the filename regex matches fsdss206.*mp4.*upd . Then, compare the timestamp of the "UPD" file to any existing file on your disk.
If you can share the (log, filename, download link context, or folder structure), I can narrow this down to a single definitive explanation. fsdss206mp4 upd
Malicious uploaders sometimes add upd to outdated files to trick downloaders. For advanced users, query a public indexer API
The original may have had dummy data or padding. The UPD likely uses a more efficient x264 or x265 codec preset. Solution: Trust the upd tag. Run ffmpeg -i fsdss206mp4_upd.mp4 to check the actual bitrate and frame count. Lower file size does not equal lower quality if the encoder settings were improved. If you can share the (log, filename, download
: This specific string is often linked to legacy device drivers for specialized industrial hardware or older multimedia playback components.