I suspect they can already do this with variable bitrate codecs which have a unique signature via the video file metadata. Here Phil Zimmerman explains this vulnerability: https://youtu.be/59sWJT6uso0?t=2501
During the hunt for Bin Laden the NSA/GCHQ had "voice prints" which can be matched with other audio recordings to link phone calls or identities. It was also apparently used to locate Rmazi Binalshibh, a senior al Qaeda operative was was caught in 2002. The book by Richard Aldrich, GCHQ, outlines this on page 514.
I suspect they can already do this with variable bitrate codecs which have a unique signature via the video file metadata. Here Phil Zimmerman explains this vulnerability: https://youtu.be/59sWJT6uso0?t=2501
During the hunt for Bin Laden the NSA/GCHQ had "voice prints" which can be matched with other audio recordings to link phone calls or identities. It was also apparently used to locate Rmazi Binalshibh, a senior al Qaeda operative was was caught in 2002. The book by Richard Aldrich, GCHQ, outlines this on page 514.