How I would catalog police video.
Play it fast forward and record that (just like movie pirates do) then post the results on the net. 4 hours of video down to 15 minutes.
After that do a complete archive where the video is shown at fast forward or slow motion with the important parts being played forward and backward a number of times along with some text comments as to the action.
The whole privacy concerns are a pathetic attempt to derail video recordings. Everybody is sexting these days. The only ones to benefit from restricting video are the perpetrators.
To ensure we get ALL the video; ride along watchdogs and / or paparazzi drones should be used.