[any ANONYMOUS forum user]

Is there any way to download RTMP Dynamic Streaming broadcast?
http://www.learningapi.com/streamingmedia-articles/dynamic-streaming-in-flash-bitrate-switching/

[Stream Recorder]

Replay Media Catcher (http://all-streaming-media.com/record-video-stream/Replay-Media-Catcher-HTTP-RTMP-FLV-MP3-ripper-recorder.htm) 4 and WM Recorder (http://all-streaming-media.com/record-video-stream/WMRecorder-One-click-online-audio-video-stream-recorder.htm) 14.8 work just fine with such streams. You can also try other RTMP downloaders / RTMP capture software.

Related:
FAQ: How to record/download/capture/save Adobe Flash .FLV video RTMP stream from embedded player (http://all-streaming-media.com/faq/recording-media-stream/faq-record-download-capture-save-flash-flv-video-rtmp.htm)
How to record rtmp:// flash video .flv stream from embedded Adobe Flash Player

[KSV]

rtmpdump.exe -r rtmp://streaming.learningapi.com/cfx/st/mp4:Spinoffs_2_Water_1800Kbps.mp4 -o 1800.flv

RTMPDump v2.3 r568 (Compiled by KSV)
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
WARNING: HandShake: client signature does not match!
INFO: Connected...
Starting download at: 0.000 kB
INFO: Metadata:
INFO: duration 189.17
INFO: moovPosition 36.00
INFO: audiocodecid mp4a
INFO: width 1024.00
INFO: height 576.00
INFO: videocodecid avc1
INFO: avcprofile 77.00
INFO: avclevel 31.00
INFO: aacaot 2.00
INFO: audiosamplerate 44100.00
INFO: audiochannels 2.00
INFO: videoframerate 29.97
INFO: tags:
INFO: cpil 0.00
INFO: tmpo 0.00
INFO: ©too Sorenson Squeeze 5.0
INFO: trackinfo:
INFO: length 8342528.00
INFO: timescale 44100.00
INFO: language und
INFO: sampledescription:
INFO: sampletype mp4a
INFO: length 17024031.00
INFO: timescale 90000.00
INFO: language und
INFO: sampledescription:
INFO: sampletype avc1
INFO: length 113503.00
INFO: timescale 600.00
INFO: language und
INFO: sampledescription:
INFO: length 113503.00
INFO: timescale 600.00
INFO: language und
INFO: sampledescription:
INFO: length 8342528.00
INFO: timescale 44100.00
INFO: sampledescription:
INFO: length 17024031.00
INFO: timescale 90000.00
INFO: sampledescription:
7686.908 kB / 34.67 sec (18.3%)

Just change the bitrate at end of rtmp url to download the video at specified bitrate.