[bigiain]

In Australia, at least in the late 90s, you were allowed to record voice and video without consent or notification of all parties, but you were not permitted to play/show the recordings to anyone else.

This was well know amongst the sort of people who regularly got harassed by police (in my circle of friends, riders of sportsbikes). There was well known legal advice saying to record every interaction you had with police, and if it turned out badly in any way, as soon as you got home write down the transcript of the conversation as "contemporaneous notes" and email them to your gmail account to establish a timestamp. But the only time you ever even mentioned your recording would be to your lawyer, so that if the cop challenged or contradicted your notes in court, your lawyer could then offer the recording as evidence.

These days, dashcams are pretty ubiquitous, and demonstrate that whatever the legal technicalities are, video recording in public without consent is not only widespread, but bashcam footage is also something police regularly request from the public.