You can publish a rtmp stream to a rtmp address and then playback with an external player like JWPlayer.
If you publish StreamName to rtmp address rtmp://your-rtmp-address-here then you will need to configure JW Player:
var flashvars = { file: StreamName.flv, streamer: rtmp://your-rtmp-address-here, autostart:”true”, type:”rtmp”}

Webcam video streams can be published from web with a video Live Streaming broadcasting script. With the VideoWhisper Live Streaming soulution, StreamName is channel name (in example Studio586). Important: As latest VideoWhisper solutions also support P2P streaming, these need to be configured with alwaysRTMP=1 parameter in their _login.php or equivalent script so streams are always published to RTMP server.

If you want to publish for other devices special encoders and codecs would be required. Using an external encoder you can encode with codecs and settings not available in browser flash player (due to flash limitations). Not all encoders and versions are compatible with all rtmp servers and versions. Some require special configuration and usage instructions.

Adobe Flash Media Live Encoder can be used for Adobe Media Interactive server and is also reported to work with Wowza.

Wowza & Wirecast documentation and support is available for Wowza Media Server hosting.

Note that when publishing H.264, video player should be configured to play StreamName.mp4 instead of StreamName.flv .

This post shows how to install Wowza on a server where there is another RTMP server, already installed, i.e. Red5. Run 2 rtmp servers at same time and allow applications to connect on both simultaneously.

First install Wowza Media Server. Update version if necessary.

cd /root/tmp
wget http://www.wowzamedia.com/downloads/WowzaMediaServer-2-0-0/WowzaMediaServer-2.0.0.rpm.bin
chmod a+x WowzaMediaServer-2.0.0.rpm.bin
./WowzaMediaServer-2.0.0.rpm.bin

Then fill your Wowza Media Server license ( a free developer license for 10 connections can be used for testing):

cd /usr/local/WowzaMediaServer/bin
./startup.sh

Change rtmp port in /usr/local/WowzaMediaServer-2.0.0/conf/VHost.xml from 1935 to some other port not in use (i.e. 1936):

<Root>
<VHost>
<HostPortList>
<HostPort>
<ProcessorCount>4</ProcessorCount>
<IpAddress>*</IpAddress>
<!– Separate multiple ports with commas –>
<!– 80: HTTP, RTMPT –>
<!– 554: RTSP –>
<Port>1936</Port>

Run Wowza in background. You can also add this to /etc/rc.d/rc.local to have it running on each server restart:

cd /usr/local/WowzaMediaServer/bin
./startup.sh > start.log &

Now you’ll be able to access wowza rtmp applications with rtmp://your-server:1936/your-wowza-application while red5 applications will be accessible the old way with  rtmp://your-server/your-red5-application .

An example of 2 rtmp servers running on same linux server is the VideoWhisper Webcam Video Recorder.

Red5 Video Recorder
Wowza Video Recorder