rtmpdump from home:Kenzy:rpmfusion:40 project
Select Your Operating System
Add repository and install manually
For Fedora 40 run the following as root:
dnf config-manager --add-repo https://download.opensuse.org/repositories/home:Kenzy:rpmfusion:40/Fedora_40/home:Kenzy:rpmfusion:40.repo dnf install rtmpdump