Originally Posted by itsme

Yes they do, though MFC starts at values above 0 but you just have to substract the start value and you always get the correct timestamp

I don't know any fix you could apply without having access to the source code. Just use another streaming recorder or if you know the developer of RMC, pass them the source code of rtmpdump/red5 since the rtmpdocumentation released by adobe is lacking of essential information.