Hi, I've hit same bug, Upgrading librtmp to latest (in testing, 2.4+20151223.gitfa8646d.1-1) fixed it for me. To be exact:
Unpacking librtmp1:amd64 (2.4+20151223.gitfa8646d.1-1) over (2.4+20150115.gita107cef-1) -- Mariusz Gronczewski (XANi) <xani...@gmail.com> GnuPG: 0xEA8ACE64