librtmp

The Real-Time Messaging Protocol (RTMP) is used for streaming
multimedia content across a TCP/IP network. This API provides most client
functions and a few server functions needed to support RTMP, RTMP tunneled
in HTTP (RTMPT), encrypted RTMP (RTMPE), RTMP over SSL/TLS (RTMPS) and
tunneled variants of these encrypted types (RTMPTE, RTMPTS). The basic
RTMP specification has been published by Adobe but this API was
reverse-engineered without use of the Adobe specification. As such, it may
deviate from any published specifications but it usually duplicates the
actual behavior of the original Adobe clients.

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Updated to v2.6 from March 2024 at https://git.ffmpeg.org/rtmpdump
It may report itself as an older version.