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VAD

Reverse-Engineering Standards Technology DTX, FEC, Opus, redundancy, SDP, VAD

RED: Improving Audio Quality with Redundancy

Back in April 2020 a Citizenlab reported on Zoom’s rather weak encryption and stated that Zoom uses the SILK codec for audio. Sadly, the article did not contain the raw data to validate that and let me look at it further. Thankfully Natalie Silvanovich from Googles Project Zero helped me out using the Frida tracing […]

Philipp Hancke · August 20, 2020

Guide audio level, FFT, getUserMedia, RMS, VAD, volume, Walkthrough, Web Audio

Shut up! Monitoring audio volume in getUserMedia

A few days back my old friend Chris Koehncke, better known as “Kranky” asked me how hard it would be to implement a wild idea he had to monitor what percentage of the time you spent talking instead of listening on a call when using WebRTC. When I said “one day” that made him wonder […]

Philipp Hancke · December 10, 2015

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