Download• All of youtube music download services reencode the original .aac audio file before they let you download it, leading to a degradation of quality, even those that let you choose to download as aac/m4a.
• The only way to losslessly download music from youtube is to download the 720p .mp4 directly from youtube, and extract the .aac audio inside it.
• AAC is however not suitable for general use and it's preferable to leave it in .mp4 container like m4a.
• mp4 Audio Extractor will let you quickly and easily convert .mp4 audio+video into audio only .mp4, by removing the video, and never touching the audio. It will also rename the file to .m4a for convenience.
• mp4 Audio Extractor is frontend GUI for mp4box. While there are others, this one is designed to be as user-friendly and do its job in as little clicks as possible, supporting drag'n'drop and the like.
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User Reviews
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I downloaded this zip file to Win10 platform and extracted. Norton Internet Security scanned the download and rejected the library.dll and deleted it citing reputation. It also stated there were many users. No other information. So I am reluctant to use it. So i cannot rate the optional aspects.