Code:
rtmpdump -r rtmp://s4qfl.castup.net/993850044-123.flv -y _definst_ -o a.flv
RTMPDump v2.4-76-g9ac8171
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
Starting download at: 0.000 kB
INFO: Metadata:
INFO: width 1280.00
INFO: height 720.00
INFO: framerate 25.00
INFO: videokeyframe_frequency2.00
INFO: audiocodecid mp4a
INFO: audiodatarate 64.00
INFO: audiosamplerate 48000.00
INFO: audiochannels 2.00
INFO: audiodevice Elemental Technologies Live
INFO: videodevice Elemental Technologies Live
INFO: videocodecid avc1
INFO: videodatarate 819.00
1130.125 kB / 11.67 sec