Fix #607, set RTMP identifying recursive depth to 3.
Fix #607, set RTMP identifying recursive depth to 3.

winlinvip/simple-rtmp-server,ossrs/srs,ossrs/srs,ossrs/srs,ossrs/srs,ossrs/srs,winlinvip/srs,winlinvip/srs,winlinvip/srs,winlinvip/srs,ossrs/srs,winlinvip/srs,winlinvip/srs