Debug log

In case you need to solve a streaming problem you might need to watch debug log. For that configure nginx with --with-debug flag.

cd nginx-X.Y.Z./configure --add-module=/path/to/nginx-rtmp-module --with-debug ...

After compiling set nginx error.log level to debug in nginx.conf

error_log logs/error.log debug;

After that you will have a lot of debug info in error.log. Please grep what your problem relates to (exec, notify etc) and post to  to help with solving it.