![]() ![]() The final section of the post concludes that the MusicBrainz database contains errors, and may require some refined familiarity to use effectively. In summary, this post explores the use of ExifTool and Excel to obtain and analyze MP3 tags, and the use of MusicBrainz Picard to automatically or semi-automatically revise tags for a large number of MP3s. This post describes the steps I took in those directions. In the process, I thought I might also try to clean up relevant tags in the. ![]() (A similar tool for MP3 files is available in the mp3gain package in Debian/Ubuntu).I had a bunch of MP3 files, with names in this format: “Beatles–Yesterday.mp3.” I wanted to add the year to the filename, like this: “Beatles–Yesterday (1965).mp3” - using, perhaps, what I had previously learned about putting metadata (a/k/a “tags”) into filenames. The vorbisgain command-line tool, available in the vorbisgain package in Debian/Ubuntu, can be used to indicate the ReplayGain of an individual Ogg Vorbis file before ingest into LibreTime. Large transient peaks in otherwise quiet files should be avoided, to guard against the need for peak limiting when ReplayGain is applied to those quieter files. If the producers are working to a different loudness standard, the ReplayGain modifier in LibreTime's Stream Settings page can be adjusted to suit their material. Your station's producers should therefore aim for 14dB between peak and average loudness to maintain the crest factor of their prepared material (also known as DR14 on some dynamic range meters, such as the command-line DR14 T.meter available from ). (See for a detailed analysis of the problem). ![]() This may be an issue for contemporary popular music, which can average at -9 dBFS or louder before ReplayGain adjustment. See for more details of ReplayGain.īecause of this automatic gain adjustment, any files with average loudness higher than -14 dBFS won't sound louder than quieter files at playout time, but the lower crest factor in the louder files (their relatively low peak-to-average ratio) may be apparent in the output, making those files sound less dynamic. At playout time, the ReplayGain value is provided to Liquidsoap so that gain can be automatically adjusted to provide an average output of -14 dBFS loudness (14 decibels below full scale). On file ingest, LibreTime analyzes each Ogg Vorbis, MP3, AAC or FLAC file's loudness, and stores a ReplayGain value for that file in its database. You can install python-mutagen with the sudo apt-get install python-mutagen.įor example, to preview the conversion of tags from Windows-1251 (CP1251) character set to UTF-8 for a whole archive of MP3 files, you could use the command: The program mid3iconv (part of the python-mutagen package in Debian and Ubuntu) can be used to batch convert the metadata character set of files on the command line. If you have an archive of files encoded with metadata in a legacy character set, such as the Cyrillic encoding Windows-1251, you should convert these files before import. Programs such as Ex Falso (described above) encode metadata in UTF-8 by default. LibreTime expects file tag metadata to be stored in the international UTF-8 character set. Sometimes there is useful creator or title information in the file name or directory path structure, which can be converted into an ID3 tag automatically. ![]() The Tags From Path feature of Ex Falso is a particularly useful time saver if you have a large archive of untagged files. MusicBrainz Picard (Mac, Windows, Linux).You can use a music library manager (like Apple Music, Rhythmbox, or Windows Media Player) to edit ID3 tags as well, but you may be required to import the files into your library, which may not always be convenient. There are a number of programs available which can be used to correct mistakes or incomplete information in ID3 tags. Files with metadata such as track title and artist information may be difficult to locate in larger libraries, or add to shows, playlists, or smart blocks. If these tags are incorrect or are missing information, you will have to either edit the metadata manually. LibreTime automatically imports any metadata that is in the files' ID3 tags. Getting your ingest workflow right will save you a lot of time later. Before uploading media to an LibreTime server, there are a number of factors which should be considered. ![]()
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