YouTube is by now the most popular online music provider, if you want to extract mp3 from those YouTube Videos, they will plug-in a video converter, which can convert YouTube flv to mp3. Generally, it may lose lots of quality while converting video to audio.
How to extract mp3 from flv videos, YouTube videos?
Software Required: Wondershare Streaming Audio Recorder,a streaming mp3 recorder to extract mp3 from YouTube, extract mp3 from flv with high quality.
Download url:http://www.download-streaming-video.com/streaming-audio-recorder/#137
Key Features:
1. Newest technology to extract mp3
Virtual sound card to extract mp3 from flv videos, YouTube videos
2. High audio quality on all mp3 files.
3. Edit ID3 tag information for the mp3 music
4. Automatically Split radio melody one by one during recording
With this simple tutorial of extract mp3 from flv, youtube, so you can play them on your MP3 player or import them to your iPod, iPhone or Zune, etc.
Step 1, Launch Streaming Audio recorder and make sure the sniffer is opening.
Tip: If you want to save the audio files as MP3, WMA, WAV, AC3, M4A, AAC, OGG, APE etc.
Click to change output music format. The default audio format is mp3 here.
Step 2, Open YouTube.com and choose a music video, for example:

Step 3, Click to extract mp3 from flv videos, flv videos.
When YouTube music video is playing, streaming audio recorder will extract mp3 from flv videos the background automatically.
After all have finished, right click the key of "Browser" to check the mp3 files extracting from flv videos.