You need two things: a flv encoder and a web-based flv player. Why? Because a flv encoder is used to convert your avi to flv and a web-based flv player is used to play the resulting flv on website. First thing, flv encoder. Good and free flv encoder like Moyea Video4Web Converter, which you can try. The second thing, flv player. You can use playerdiy.com, it is a quick way to make flash video player for website. On mac, Doremisoft AVI to Flash converter for mac makes these tough work easy by a few steps. With mac AVI to FLV converter, you are allowed to convert the common format AVI to FLV(flash video), convert AVI to SWF and generate a HTML web page embedded with Flash video.
The best way to convert FLV to AVI is to use software program
You can use SWF & FLV Toolbox by Eltima Software.
I think the FLV to AVI MPEG WMV 3GP MP4 iPod Converter is your best choice, it always works well for me. it can convert Flash Video FLV to AVI, FLV to MPEG, FLV to WMV, FLV to MP4 format.with excellent quality.
You can convert Shockwave Flash (*.swf) files into Screen Saver files (*.scr) using a program like InstantStorm, see the related link for their homepage.With a FlV converter, convert FLV or .swf files to gif or aiv.http://www.sharewareguide.net/article/Tip/avi-to-flv-converter:-how-to-convert-avi-to-flv-file.html
I always use wondershare video converter ultimate. It's powerful that can convert videos to any formats, such as AVI, WMV, MP4, MKV, FLV, 3GP, MPG--even convert video to 3D. You can try it!
uSeesoft FLV Converter can do it for you it can convert FLV and YouTube videos to almost any video/audio format with unmatchable conversion speed and high quality, such as converting FLV to WMV, converting FLV to AVI, converting FLV to MP3, converting FLV to MPEG, converting FLV to MP4, etc.
Here is a guide about how to convert FLV to WMV, same way to convert FLV to AAC because Daniusoft video converter support convert FLV to AAC too.
I use this program: Aunsoft SWF Converter to convert flash files. It lets you convert animations and movies done in Flash (SWF) to video formats like MPEG, MP4, 3GP, MOV (Quicktime) or WMV. Thus you can enjoy them not only on your PC but also on your portable devices like iPod, mobile phone or PSP, or simply on the PC but viewing them in any player as they are much more compatible. Visit 'Related links' below for a swf converter. I also like Moyea swf converter
I always use Nidesoft video converter, this converter can convert flv to mp4 in high quality at fast speed, besides, it can convert between almost all oher popular video and audio formats. it is also easy to use, only a few clicks were needed.Convert any online flv / youtube video to iPod / zune / PSP / MP3 / MP4 Portable player directly.it is full free!!You can use moyea flv converter and FLV to AVI MPEG WMV 3GP MP4 iPod Converter V4.2, both of them are professional FLV converter software which can convert Flash Video FLV to AVI, FLV to MPEG, FLV to WMV, FLV to 3GP, FLV to MP4, FLV to iPod, etc.
At first, convert FLV to other formats such as AVI, MPEG, etc. Then burn them on DVD. I usually use this program Aunsoft FLV Converter to help me do this trick. It can convert FLV to many other popular formats, such as MP3, WAV, AVI, MPEG, MOV, WMV, MP4. compatible with VCD, SVCD and DVD etc. It's easy-to-use and the conversion speed is fast. So I think you can have a try: http://www.aunsoft.com/flv-converter/
Use a converter that works for both filetypes.