media-video/
flvstreamer

Open source command-line RTMP client intended to stream audio or video flash content

https://savannah.nongnu.org/projects/flvstreamer/

There are no open security bugs.

You think something is missing here?
Start with filling a new security bug.

Please file new vulnerability reports on Gentoo Bugzilla and assign them to the Gentoo Security product and Vulnerabilities component.