From T7R Studio:
Free FLV Converter is a fast and easy-to-use FLV Converter software, which can convert FLV videos to MP4 format free as well as convert video to audio formats including MP3. It supported iPhone, iPad, iPod and Android phone, etc. with excellent image/sound quality.
1, Convert FLV to MP4/ MP3. Free FLV Converter helps you convert FLV to MP4 video format, even videos to HD and 3D videos. You can also convert your video to MP3 audio format.
2, Support multiple devices. Why not enjoy your video on these devices such as iPhone 6s/6s plus/6/6 plus/5/5s/5c/4s/4 and Samsung, HTC and more devices anywhere and anytime. This Free FLV Converter is compatible with all of them.
3, Fastest speed and best quality. Free FLV Converter supports the fastest conversion speed and the best conversion quality. Users will finish conversion in a short time without quality loss.
4. Free forever. Free FLV Converter is easy to use which provides free conversion and will be free forever. It belongs to everyone, as long as you download and install it. Any user needs no payment.
What's new in this version:
Support iPhone 6s/6s plus, and iOS 9.
Improve the speed of converting FLV to MP4, MP3.
For better user experience with high output quality.
The conversion is of good quality. The program is very stable and crashes are rare.
Sometimes I select a .flv file that I already converted to .mp4 and click convert. The program warns me that I already have the converted file in the destination directory. I have an option to replace it: Yes, No, Cancel
The Cancel button does not work. The No button does not work. It will start converting the file that is already converted. This should really be fixed.
It is also not possible to select several files to do a batch convert.