download rtmp videos

To download RTMP (http://en.wikipedia.org/wiki/Real_Time_Messaging_Protocol) videos,

# apt-get install rtmpdump
$ rtmpdump -r < rtmp://url/ > -o < output_file.mp4 >

eg:
$ rtmpdump -r rtmp://foobar.com/mp4:videos/123/foo.mp4" -o foo.mp4