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wireshark

Guide debug, video_replay, wireshark

Capture & Replay WebRTC video streams for debugging – video_replay 2025 update

Debugging WebRTC media issues, especially video, often requires access to the unencrypted RTP payloads. We talked about this back in 2017 already and had a great blog post on using the libWebRTC “video_replay” tool. While that post has aged remarkably well, video_replay has improved significantly, in particular since it is now possible to create the […]

Philipp Hancke · January 21, 2025

Reverse-Engineering apple, Blackbox Exploration, e2ee, FaceTime, ios, wireshark

FaceTime finally faces WebRTC – implementation deep dive

Deep dive analysis on how FaceTime for Web uses WebRTC. Philipp “Fippo” Hancke uses webrtc-internals, Wireshark, and reviews the JavaScript implementation to expose Apple’s implementation details.

Philipp Hancke · June 14, 2021

Guide fuzzing, janus, libfuzzer, OSS-Fuzz, wireshark

How Janus Battled libFuzzer and Won (Alessandro Toppi)

Thanks to work initiated by Google Project Zero, fuzzing has become a popular topic within WebRTC since late last year.  It was clear WebRTC was lacking in this area. However, the community has shown its strength by giving this topic an immense amount of focus and resolving many issues.  In a previous post, we showed […]

Alessandro Toppi · March 6, 2019

Reverse-Engineering Blackbox Exploration, SDES, wireshark

Messenger was not forced to wiretap but…

By david drexler – Flickr, CC BY 2.0, Link   Back in August, Reuters reported on a “secret legal fight” between the FBI and Facebook about wiretapping Messenger calls. The Verge as they found our old post about reverse-engineering Messenger from 2015 and had a number of follow-up questions on it for a Messenger wiretapping article they ran. Technical […]

Philipp Hancke · October 1, 2018

Guide debug, stian selnes, video, video_replay, wireshark

How to capture & replay WebRTC video streams with video_replay (Stian Selnes)

Note: see here for a 2025 update to this post. Decoding video when there is packet loss is not an easy task.  Recent Chrome versions have been plagued by video corruption issues related to a new video jitter buffer introduced in Chrome 58. These issues are hard to debug since they occur only when certain […]

Chad Hart · August 31, 2017

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