5 ms·
Network frequency changes and fluctuates around 50hz. This change is random and unique. It is also captured on video/audio recording as background hum. This da
by Thri4895o 3y ago
Network frequency changes and fluctuates around 50hz. This change is random and unique. It is also captured on video/audio recording as background hum.
This data is quite valuable. You can reconstruct exact time (and region) when any video was taken.
- 127361 3y agoThe police keep track of this, and it can be used to validate audio recording evidence. https://en.wikipedia.org/wiki/Electrical_network_frequency_analysis https://en.wikipedia.org/wiki/Electrical_network_frequency_a...
- toomuchtodo 3y agohttps://news.ycombinator.com/item?id=38161677 https://news.ycombinator.com/item?id=38161677 https://datethis.app/ https://datethis.app/