From Aiseesoft Studio:
Aiseesoft FLV to MP3 Converter has the ability to convert FLV and other various video/audio formats to popular audio, like AAC, AC3, AIFF, AMR, FLAC, M4A, MKA, MP3, OGG, WAV, and even more. What's more, it can also offers powerful editing functions for you to use. Moreover, it will bring you much faster converting speed with the AMD APP and NVIDIA CUDA technology. Plus, after updated, it supports iPhone 5s/iPhone5c, iPod Touch 5 and iPod Nano7 now.
To customize FLV video, you can adjust the video effect parameters, video Brightness, Contrast, Saturation and audio volume. And it could help you cut any audio clip from the FLV file with the "Trim" function. With the help of "Merge" button, you can join multiple FLV files together and output a single audio file.
Aiseesoft FLV to MP3 Converter can offers many other useful functions to you. It provides you with detailed audio settings, including Audio Encoder, Sample Rate, Channels, and Audio Bitrate. And all the settings can be saved in the option list of "User-Defined". Besides, the built-in player could assist you to preview the source and edited FLV file. And during the process, you can capture your favorite image. It also allows to input the same source FLV file repeatedly and set different output audio formats for each. Then you can get different output audios with only one conversion.