Yes, rtmp streams are working. If audio is played it means there should be no problem with rtmp protocol, can you share a link?
#SERVICE 5002:0:1:2:0:0:0:0:0:0:rtmp%3a//rtmp.one.by/HD/1muz:FIRST CHANNEL HD #DESCRIPTION FIRST CHANNEL HD
here is the example link, a russian music channel
on gstreamer stream works perfectly (5001/4097) - screen