However, if you want to work with the ultimate conversion tool for FLV and MP3 files, or any other video or audio formats, UniConverter ( Mac version) is definitely your best option. Some of them will even invite you to download desktop software, since it is a much more powerful option and one you can work much better with. Each one may have certain nice features and their cons as well, but as you could see, online converters in general do not allow you to control many aspects of your conversion, mostly these will also impose limitations for the files that you can upload or even how you download the final converted files, in order to get you to access a 'Premium account' or similar. These are just a few of the options that you have for online conversion. Best Desktop Software to Convert FLV to MP3 - UniConverter Part 2: Top 5 Online FLV to MP3 Converter.There are a lot of programs for both Windows and Mac operating systems that are able to open. It often uses h.264 or h.263 codecs for video storage and MP3 for audio. Part 1: Recommend the Best Desktop Software to Convert FLV to MP3 FLV is a Flash Video container used on popular hosting sites that stores audio, video and other data.Here are some of the best services you can try for this. Other than desktop software, you can also find multiple services online that can help you at converting from FLV into MP3, which is very useful when you want to do a conversion on the go without installing anything on the computer. 3.5 Convert MP4 to MP3 on Windows Media Player.2.6 YouTube to MP3 Converter for Chrome.2.2 Convert YouTube to High Quality MP3.2.1 YouTube to MP3 Converter App for iPhone.1.13 Convert Windows Movie Maker to MP3.

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