BonkEnc

BonkEnc is a free audio converter and CD ripper which integrates various popular formats and encoders. It currently supports MP3, MP4/M4A, Ogg Vorbis, FLAC, AAC and Bonk files.

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Here is the Tutorial for Encode YouTube mp4 to mp3

• Suppose , when you are downloading the Youtube HQ in mp4 format you can select "mp4 files like below screen shot
  

• "encode -> Start encoding (Ctrl+E).

you will see the output directory and look for the converted file

Features

• Friendly interface and easy to use.
  
• Free audio converter and CD ripper.
• Supports MP3, MP4/M4A, Ogg Vorbis, FLAC, AAC and Bonk files.
• It easy to convert your audio CDs to MP3 or Ogg Vorbis files.
• The program supports the CDDB/freedb online CD database and CD Text and automatically writes song information to ID3v2 or Vorbis comment tags.

Download Convert And Encode YouTube mp4 to mp3