Hi,
Thank you for the report. There are 2 issues here. Both of them are known and they are already fixed. They will be available on the next release for sure.
1. maximum ACK window size is too low.
2. There is no way to determine the the application name and the stream name from that URL. The fix is very simple. The URL should be specified like this:
Normal live stream or an FLV file
rtmp://john:secretpassword@www.example.com:6543/some/application/flv:some/stream/name
OR
rtmp://john:secretpassword@www.example.com:6543/some/application/:some/stream/name