I cannot convert flv extention video file it is showing error stating convert failed codec not installed so from where i can get .flv codec

Flawlessly Convert SWF to FLV-Aunsoft SWF to FLV Conversion
Our source video for a specific project was an Adobe Captivate SWF file for showing people how to logon to our webinar. We needed to convert it to FLV, so it could be posted on our website. It's actually not easy to find one good SWF converter that could handle our original file after searching on Google for "SWF to FLV converter". In about fourth or fifth page on search results, I finally found one product that meets my expectation perfectly. It's called Aunsoft SWF Video Converter. It's not expensive and we were so happy that we could finish our project in time with the help of this converting tool.
With 10 stars meaning excellent, I'd give it a 10, for it is one of the very few SWF converters that actually worked with our SWF file and did as promised. If you have SWF files needed to be converted, Aunsoft SWF Converter is a worthy choice for its price. Besides, it offers not just FLV output, but also various video & audio formats for different purposes. You will find out more later.
I will show you how to use this SWF converter to convert SWF files to FLV files. I'm sure you will be impressed by its intuitive interface.
Step 1. Add SWF file(s).
Drag and drop swf files into the app if you want to convert them at one time to FLV format.

Step 2. Choose output format and specify destination folder.
You can see a variety of output options from Aunsoft SWF Converter. In my case, I simply choose "FLV-Flash Video Format(*.flv)", the first option in "Flash Video" catalog in "Profile" drop-down list. You can also check FLV H.264(*.flv) profile for FLV video with H.264 video codec and aac audio codec.

Step 3. Choose converting mode and start SWF to FLV conversion
Click convert button to start swf to flv conversion. You will be asked to choose converting mode, auto mode or manual mode. If your SWF file has no actionscript embedded, then auto mode is recommendable. Otherwise, please choose manual mode to realize complete conversion. If you choose auto mode, the program will start conversion and you can get in FLV file in seconds in your destination folder.

And if you choose manual mode to convert your swf file, you will see the following interface. The big preview window will not play your swf file until you click "Play and capture" to start conversion in manual mode. The moment the original file finishes playing in the big window, the conversion completes. And your FLV file will be ready in output folder.