Can you post the full command line you are using please?
C:\librist-0.2-RC1\build\tools>ristsender.exe -i udp://@127.0.0.1:12345 -o 'rist://@192.168.250.115:10899,rist://@192.168.250.115:10898'
Please try with this branch: https://code.videolan.org/rist/librist/-/tree/0.2-RC2-fixes The problem is fixed there
mentioned in commit c1b49d73
mentioned in merge request !75 (merged)
closed with merge request !75 (merged)
VideoLAN code repository instance