audio/flac/video/jellyfin: restructuring entries for better navigation

wiki/audio.md

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+# Audio
+
+Music and audiobooks is nice to have on your system.
+There are multiple different approaches on how to get it working on your system
+depending on your needs.
+This entry describes how to handle audio data.
+
+## Media software
+
+If you want to keep your system clean of much data, you can use this kind of setup.
+There are differences depending on your preffered software interface.
+
+- [Airsonic](./airsonic.md) is a free fork of Subsonic, can be dockerized and has
+  a web-interface and multiple possible client options.
+
+## Audio codecs
+
+An audio codec is an encoding of an audio file.
+There are lossy and lossless codecs, the latter not compromising quality for
+smaller file sizes.
+Following is a list of codecs written about in this wiki:
+
+- [flac](./flac_(codec).md) is a lossless codec
+
+## Extract audio files from CDs
+
+You can convert your CDs to files on your computer.
+This way you don't have to search for your CDs all the time.
+
+- [Exact Audio Copy](https://www.exactaudiocopy.de) for windows can rip music
+  and automatically tag it with the help of a list of databases.
+- [metaflac](./linux/flac_(package).md) for linux is a programm
+  to edit the tags of [flac](./flac_(codec).md) files from the command line.
+  It is bundled in the `flac` package for debian and arch based systems.
+- [MusicBrainz Picard](./picard.md) for linux is a
+  graphical user interface for tagging files of many different formats.
+
+## Quality analysis of different versions of an album
+
+While deciding on what version of an album is the best visit
+[Dynamic Range DB](https://dr.loudness-war.info).
+It shows dynamic range scorings of each version.
+
+## Get additional data to an album/single
+
+If additional information for an album is needed, visit
+[Discogs](https://www.discogs.com).
+Discogs has tracklists, dates and more information to nearly all versions of
+albums and singles.
+
+## Naming convention
+
+It is suggest to place the audio files in a directory named after the album they
+belong to.
+These album directories are placed in directories named after the album artist.
+Files can be named in the following scheme:
+
+- music: `[<discnumber>.]<tracknumber>._<artist>_-_<title>`
+- audiobooks: `[<discnumber>.]<tracknumber>._<artist>_-_<album>_<tracknumber>`