How to convert .vp6 video files directly to .mp3 audio format.
Although the VP6 file format has been discontinued and replaced by the VP8 format, converting TrueMotion VP6 Video Files directly to MP3 Audio Files (.vp6 to .mp3 conversion) should still be possible. That is, using a small workaround.
It seems your best bet is to first convert VP6 to MP4. Then you should be able to easily convert MP4 to MP3.
We are not aware of any media editing software or conversion utility capable of converting VP6 to MP3 directly.