Problems with multicast over UDP as input

Hello We’re using multicast over UDP as input to Evostream. We’re using it on LAN and we’re have confirmed that the stream is arriving properly to our router and switch. When the multicast stream reaches our Evostream cloud (virtual) server, we’re not detecting packet loss, but having frame loss, frames get dropped, calculated IDS frames wrong and audio is shifted time-wise. The multicast stream has 3 different programs muxed and 3 video streams (2xH264, mpeg2video) with 3 different audio channels encoded mp2 format. We are not able to change input stream properties.