The next time you see that innocuous suffix, do not play the video. First, ask for the hash. Then, ask for the log. And only then, perhaps, ask to see what the update hid.
Data corruption has always been a risk for long-term archival. The new update adds a per-frame CRC32 checksum, stored in an extended udta atom. This allows users to verify integrity down to individual frames without re-downloading entire files—critical for legal evidence and scientific data. jur153mp4 updated