This program can extracts video and audio from FLV files without decompressing or recompressing. Extracts video and audio from FLV files without decompressing or recompressing. The video is saved as AVI (H.263/FLV1 and VP6/VP6F) or raw elementary stream (H.264/AVC). The audio is saved as MP3, AAC (with ADTS headers), Speex, or WAV (PCM).

NOTE: You cannot change the video/audio format that FLV Extract outputs. It depdends on what is contained in the FLV file. If you need a different format, you'll have to use other program to convert it. Or, ffmpeg (command line) can extract from FLV and convert in one step.
NOTE: The AVIs will not play unless you have the right decoders. ffdshow-tryouts can decode FLV1 and VP6F; make sure they're enabled in its configuration dialog.
NOTE: The extracted MP3s may appear to have an incorrect duration in your audio player. This is because FLV Extract doesn't generate a VBR header, but the files are perfectly valid nonetheless. To add a VBR header you can load an MP3 in foobar2000, right click on it, go to Utils, and click "Fix VBR MP3 Header".
NOTE: H.264 elementary streams are not widely supported by players, but you can use DGAVCDec to load them with AviSynth for editing.

The license of this software is Free Trial Software, you can free download and get a free trial.