Like u/maskedenigma was saying, try converting it to both FLAC and MP3 and see if the size difference is okay with you. Also, try listening to both files to see if the quality difference is noticeable enough. All further processing is left to AAX Audio Converter, like splitting it up into chapters or even smaller chunks or transcoding into MP3. Unfortunately, AAX Audio Converter only accepts AAX at the moment (that will change). So Book Lib Connect exports pseudo AAX files, simply renamed copies of the M4B files. In one case, the author & publishers, et al, get paid, and in the other example, they don't. Realistically, the scene people who are posting torrents are not posting on reddit asking how to convert AAX files. Directing other people on how to convert an AAX to an MP3 is likely not preventing an author from getting paid. Never convert lossy material to lossy material. Only lossless to lossy or lossless to lossless . If you do lossy lossy you get artifacts like this. 3. • 10 yr. ago. Step 1: Use Audacity. Step 2: See step 1. r/howto. MuConvert does a good job in converting Spotify podcasts to whatever formats you need. And i believe it can meet your needs. DRmare Spotify Music Converter. I've used it for a long time and it works well in converting Spotify tracks, playlists, albums, podcasts, audiobooks, and more. Anything else you do to it, including converting it to an mp3, will only make it worse. What's going on behind the scenes at YouTube? Probably not what you imagine, particularly with regard to where Opus files come from: "YouTube recommends that uploads be in the MP4 video format with AAC audio. So where does WebM and Opus come from? If I didn't get this wrong, OP wants to extract audio from MKV, then the video stream, and use them separately in a video editor. Try FFmpeg if you are comfortable with a command line tool. To extract the audio stream: ffmpeg -i input.mkv -vn output.mp3. To save the video stream: ffmpeg -input.mkv -an output.mp4. TunePat Amazon Music Converter can help you convert music from Amazon Prime Music and Amazon Music Unlimited. It can download music in MP3, AAC, WAV, AIFF, and FLAC format. You can store the converted music on your device forever and transfer them to other devices and play them offline. 1. Launch stacher, go into the Settings -> Advanced tab. There is a setting for to change the youtube-dl command line, it's locked by default to prevent accidental changes. Click the unlock icon to enable the input field and enter the path to the yt-dlp command line. ( ~/.stacher/yt-dlp ) You gotta press the 'Play' button at the end and it will start converting it. Use Shutter Encoder it's very simple, free and no ads. Another vote for FFMPEG. If you do not mess with commands, you can use StaxRip, which is a GUI-based tool on top of FFMPEG to copy video while converting audio. RB9iJb.