The project consists of a single C# code file, Red5Download.cs.  This file contains a single function, Main, which is described below.

To build the project, use the most recent build of the RtmpClient, which can be found in the file archive.

Main Function (Main)
The main application function in Red5Download.cs works as follows:
 

A	Create an FlvStuffer object.  The FlvStuffer is a class for saving RTMP audio, video and meta-data messages into an FLV file.
B	Create an RtmpClient object. The RtmpClient constructor takes one parameters, a reference to the main application window. Since Red5Download.cs runs in a console, which is windowless, this parameter can be null. EventsEnabled - Set EventsEnabled to false so the RtmpClient doesn't waste time composing events when no one is listening.
C	Create a new RTMP connection. The RtmpConnection object returned encapsulates a connection to the remote RTMP server. The behavior flags instruct the RtmpClient library to automatically respond to any request for pings or data acknowledgements that come from the server.
D	As this is not a live stream, only a short timeout is required.  (Live streams can take a few seconds to get going.)
E	Connect to the RTMP application. The RTMP application we are connecting to uses standard connection parameters.
F	Open a new RTMP stream.
G	Register a callback function for the new stream. Instead of a separate callback function defined in our code file, we are using a C# anonymous function.  For each RTMP message received on our stream, we display the details on the console, and then pass the message to the FlvStuffer to update the FLV file. This callback could be made more efficient by limiting the callbacks to only those types of messages we need to put into the FLV file, i.e., audio, video and meta-data.
H	Play the stream, from the beginning (ts=0), to the end (ts=PlayAll).
I	Loop until the streaming stops, or the user presses the "C" key.
K	Clean up the RTMP session. Delete the stream, close the connection. The RtmpClient object will be disposed of when it falls out of scope.
L	Closing the FlvStuffer will set the correct duration for the FLV file, and flush and close the FLV file.

Flv files are usually played in an Adobe Flash player embedded in a web page.


Flv is a skeleton file format, and finding a single free application to convert an Flv file to another format is not easy. 

There are two freely available applications, Mplayer and Lame.

Mplayer will convert an FLV file into a WAV audio file or AVI video file.

Lame is a freely available open-source application for converting WAV files into MP3.

Mplayer and Lame are both console applications, so can be run from a batch file or by starting a process in code.

The batch file for converting an FLV called hello.flv into an MP3 will look like this:

Mplayer hello.flv -ao pcm:file=output1.wav

Lame --priority 0 -b 128 -h --resample 44.1 output1.wav output1.mp3

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