rtmpget -V (return code: 1)
unrecognized option `--version'
rtmpget --help (return code: 0)
usage: rtmpdump -u <app> -p playpath [ -o outfile ]
-h Show this help and exit
-u <url> The full url of the rtmp application
-p <path> The play path of the stream
-s <sec> Start at the given seek offset
-l <sec> Retrieve only the specified length in seconds
-o <file> Output file for video
-v Verbose output (more 'v's for more verbosity)