ExtractFLV MP3

ExtractFLV MP3 is a straightforward and simple-to-use application that you can use to extract the audio stream from FLV video clips and save it to MP3 format.
It comes in handy for obtaining the audio channels from downloaded YouTube clips to prepare MP3 audio tracks to copy and listen on external players, for example.

Simple setup and GUI

Installing this tool takes minimal time and effort, thanks to the fact that there are no special options involved. However, you must have .NET Framework installed.
As far as the interface is concerned, ExtractFLV MP3 opts for a small window that shows a couple of options and lets you immediately dive into the conversion operation.

Extract audio from FLV clips

FLV files can be added to the task list via the file browser or drag-and-drop support. Batch processing is supported, which means that you can extract the audio stream from multiple video files at the same time and save it to different files.
The program automatically calculates the true and average frame rate, giving you the possibility to copy this information (along with the filenames and extensions) with just one click.
There are no other notable options provided by this program. Unfortunately, it doesn't implement the options to specify the preferred saving directory for the new files, nor for setting MP3 tags or editing audio properties, such as bit rate, channel mode, and sample rate.

Evaluation and conclusion

It carried out extraction jobs swiftly in our tests while remaining light on system resources consumption. We haven't experienced any stability issues, since it didn't hang, crash or indicate erorrs.
Although its set of features is not that rich, ExtractFLV MP3 provides you with a fast and easy method for creating MP3 tracks from the audio streams of FLV videos. It can be handled with ease by all types of users.