Dump chrome://webrtc-internals event log

Chrome 49 added a highly useful event log which, among other things, contains the RTP packet headers of any packets received or sent. See http://www.rtc.news/posts/aqZx7tevokRoSrSfw/how-to-get-a-webrtc-diagnostic-recording-from-chrome-49 for how to get it.

Setup

Install Wireshark and node.js if not already installed.

To install the dependencies: npm install

Usage

To dump all the packets:

node dump event_log_file

To dump all RTP traffic into a pcapng:

node rtp.js <file> | text2pcap -D -4 1.1.1.1,2.2.2.2 -u 10000,20000 -t "%T." -n - output/some.pcapng

To dump only incoming or outgoing RTP traffic into a pcapng, use either incoming or outgoing flag:

node rtp.js <file> [incoming|outgoing] | text2pcap -D -4 1.1.1.1,2.2.2.2 -u 10000,20000 -t "%T." -n - output/some.pcapng

Generating the protobuf file

rtc_event_log.proto is generated from the description in the webrtc.org tree:

protoc-c webrtc/logging/rtc_event_log/rtc_event_log.proto -o rtc_event_log.desc