Changelog for librtmp-devel-2.4-20.1.x86_64.rpm :

* Tue Aug 18 2020 RPM Fusion Release Engineering - 2.4-18.20190330.gitc5f04a5- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Thu Mar 12 2020 Leigh Scott - 2.4-17.20190330.gitc5f04a5- Rebuilt for i686
* Wed Feb 05 2020 RPM Fusion Release Engineering - 2.4-16.20190330.gitc5f04a5- Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
* Fri Aug 09 2019 RPM Fusion Release Engineering - 2.4-15.20190330.gitc5f04a5- Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
* Tue Jul 09 2019 Sérgio Basto - 2.4-14.20190330.gitc5f04a5- Add the latest 2 commits, they appear to be security commits.
* Mon Mar 04 2019 RPM Fusion Release Engineering - 2.4-13.20160224.gitfa8646d- Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild- Remove Group tag- Add BuildRequires: gcc
* Sun Aug 19 2018 Leigh Scott - 2.4-12.20160224.gitfa8646d- Rebuilt for Fedora 29 Mass Rebuild binutils issue