4. A Biblioteca do Mixx
4.1. Visão geral dos recursos da Bilbioteca
The library manages all of your music files. This is where you can find the tracks you want to play and load them into a deck or sampler; see Carregando Faixas. Mixxx imports your music library automatically when it is run for the first time, see Changing music directories for more information.
If you want to backup (or delete) your library refer to The Mixxx Settings Directory and look for
A barra lateral na esquerda contêm diferentes coleções de música. A visualização da lista de faixas na direita mostra as faixas nessas coleções.
Pesquise: Procur por faixas na sua biblioteca do Mixxx.
Tracks: View and edit your whole collection.
Auto DJ: Automaticamente carrega e faz transição de faixas para mixagem sem acompanhamento.
Playlists: Arrange tracks in a set order.
Crates: Organize tracks in (unordered) collections.
Computer: Navigate, view, and load tracks from folders on your hard disk and connected devices.
Gravações: Grave sua mixagem e veja suas gravações anteriores.
History: Browse lists of tracks played in past mixing sessions.
Analyze: Generate Mixxx-specific data for tracks before a gig.
Bibliotecas Externas: Acesse suas bibliotecas existentes do iTunes, Traktor, Rhythmbox e Banshee.
Lista de Faixas:
Ordene: Mostre e ordene as coleções de faixas por diferentes critérios.
Carregue: Arraste as faixas que você quer tocar para o mostrador de onda.
Edite: Avalie as faixas e edite as propriedades das faixas.
4.2. Tracks - View and edit your whole collection
- Personalizando a visualização
Move columns by clicking a column header and dragging it to another position. Right-click on a column header to show or hide individual columns. Adjust the column width to fit the contents of the rows by double-clicking on the separator between two column headers.
- Ordenando Faixas
As faixas são ordenadas automaticamente pela coluna ativa. Clique em um topo de coluna ativo para inverter a ordenagem. Clique em outro topo de coluna para mudar a coluna ativa.
You can sort multiple columns by clicking up to three column headers you wish to sort your tracks by. This makes searching for tracks in a large list more efficient. Clicking twice on a column header will reverse the sort order.
Click on the BPM column header -> list is sorted by BPM
Click on the Year column header -> list is sorted by year. If year is equal, it is still sorted by the last criteria, e.g. BPM.
Click on the Genre column header -> list is sorted by genre. If genre is equal, it is still sorted by year. If genre and year is equal, then it is sorted by BPM.
Click on the Preview column header to randomly sort tracks.
Sort keys by circle of fifths
Click on the Key column header. The order starts with C at the top, then its relative minor (a), then adds 1 sharp (G), then G’s relative minor (e), and so adding sharps/removing flats around the circle of fifths. For Lancelot notation, it starts with G#m at the top, which is 1A in that notation, and proceeds alphanumerically (minor keys appear before their relative major keys in this case).
- Avaliando faixas
Esteje certo de que a coluna Avaliação não está escondida. Avalie faixas ao clicar nas estrelas do campo de avaliação.
- Edição de Faixas na Linha
Mixxx reads metadata from the tracks to fill the columns of the library. Double-click on a field, edit the data, and hit Enter when you are done. Go to the chapter edit metadata for detailed information.
- Carregando faixas
- Importando faixas
Mixxx imports your music library automatically when it is run for the first time. Go to the chapter Changing music directories for detailed information.
- Pré-escutando faixas
To pre-listen to tracks in your headphones without loading them to a regular deck, click the icon in the Preview column. Go to the chapter Pré-escutando Faixas for detailed information.
- Arte da Capa/Álbum
Mixxx can display cover art it finds for a track in the library. It will search for available cover art in the following places in order and will use the first one it finds:
The first image saved in the track’s ID3v2/Vorbis tags
An image file in the track folder (if there is only one image file there.)
%arquivo-base-da-faixa%.jpgno diretório da faixa para
O MIxxx suporta os seguintes tipos de imagem: jpg, jpeg, png, gif, bpm
- Reexaminar a Biblioteca
If you want to manually refresh your library without exiting (for example because you added or moved files) you can do this within the menu at the top of the application window. You can prompt an automatic rescan when Mixxx is started under .
Rescanning the library will add new files to the library and mark tracks as missing if the corresponding file has been deleted. It tries to detect and relocate missing tracks if files have been renamed or moved into another directory.
Automatically refreshing the metadata of tracks when files have been modified by an external application is not supported, yet. In this case you need to select the affected tracks and (re-)import their metadata from file tags.
The Missing Tracks view is accessible by expanding the Library tree item in the sidebar. Any tracks that were previously loaded into your library but were later not found on your drive will appear here. Mixxx does not automatically delete records of missing tracks so that extra metadata Mixxx might have (such as hot cues and beat grids) will not be lost in case the file is replaced.
As funcionalidades em detalhe:
Botão de Selecionar Tudo: Seleciona todas as faixas na visualização atual.
Botão Eliminar: Elimina as faixas selecionadas da biblioteca do Mixxx, mas não remove elas do seu computador. Isso vai deletar todos os metadados que o Mixxx tem da faixa.
4.3. Carregando Faixas
Faixas podem ser carregadas em um deck de várias maneiras:
Right-click the library track table: Right-clicking on a track in the table will present the options Load in Deck 1 and Load in Deck 2, among others. Making either selection will load a track into a deck.
By Usando um Teclado to load the selected track in the library track table. Use keyboard ↑ and ↓ arrow button to select a track, Shift + ← to load into Deck 1 and Shift + → to load into Deck 2.
Drag-and-drop from library track table: Dragging-and-dropping a track from the track table onto a waveform display will load the track into that deck.
Drag-and-drop from deck to deck: Once you’ve loaded a track to deck, sampler, or preview deck, click on the track title, track artist or cover art and drag it to another deck or sampler. Note that you can also drop tracks onto Playlists and Crates in the sidebar, as well as into track tables of active Playlists or Crates.
Drag-and-drop from external file browser: Dragging-and-dropping a track from an external file browser directly onto a waveform display in Mixxx will load that track. This function also works with some other applications. For example, on macOS, dragging-and-dropping a track from iTunes onto one of Mixxx’s waveform displays will load it into that deck.
4.4. Procurando Faixas (Pesquisa)
The search function filters the currently displayed list (e.g. a playlist, a crate, or even the whole library) for tracks that match your search query.
Activate the search input field by clicking in it or pressing CTRL + F (Windows/Linux) or CMD + F (Mac).
Type your search term(s). Mixxx filters the tracks as you type and shows only those matching the search term(s). Search terms can include an artist’s name, a song title, BPM, etc.
Para limpar o campo de pesquisa pressione ESC ou clique no botão limpar perto do campo.
Hit TAB to cycle between the search and the list of results in the library. Use the ↑ and ↓ keys to scroll in the list of results.
Se o campo de pesquisa estiver com foco, os atalhos de teclado estarão desativados, veja Usando um Teclado.
Usando operadores de pesquisa
Operadores de pesquisa permitem que você forme pesquisas mais complexas. Elas permitem que você limite certos termos de pesquisa para propriedades particulares de suas faixas.
O Mixxx suporta os seguintes filtros:
Text filtering: album_artist, album, artist, comment, composer, crate, genre, grouping, location, title
artist: “com truise” album:Danger genre: Trance title: foo composer: foo comment: foo genre:hip-hop -genre:gangsta
It doesn’t matter if you have space between the colon and the argument or not. Quotes must be used for multi-word text arguments.
Numeric filtering: bitrate, bpm, played, rating, track, year
bpm:140 bpm: >140 year: <2010 bpm: >=140 rating: <=4 bpm: 140-150 played: >10
You can put a space after the colon but currently there must be no space between the operator and the number.
Special filtering: key, duration, added, dateadded, datetime_added, date_added
Supports fuzzy matching of key searches. The following example lists tracks with harmonically compatible keys to C# minor.
You can combine operators but there’s no way to do an “OR” search right now. The following example lists all tracks by “Danger” over 3 minutes long that are rated 4 or 5.
artist:Danger duration:>3m rating:>=4
Filtros de pesquisa negativos. Use o prefixo
-como operador de negação. O exemplo seguinte vai encontrar “hip-hop“ de qualquer ano menos o de 1990.
Search for empty fields. The following example lists all tracks without a genre. It works for all text fields, including crates.
duration:2m10 duration:<2:10 duration:>1m35s duration:>62
You can put a space after the colon but currently there must be no space between the operator and the number.
4.5. Pré-escutando Faixas
To pre-listen to a track, activate the Preview column in a library view. Clicking the icon in the library’s Preview column loads the selected track into a special Preview Deck that will only output sound in the headphones channel. Click the icon to stop the playback.
Alternativamente, selecione uma faixa da lista de faixas da biblioteca do Mixxx, arraste a faixa para a visualização de ondas do Deck de Pré-escuta e clique no botão Tocar perto das ondas.
To display the Preview Deck, press CTRL + 4 (Windows/Linux) or CMD + 4 (Mac).
Click on the Preview column header to randomly sort tracks.
4.6. Edite os metadados dos arquivos de áudio
O MIxxx lê metadados relevantes das faixas e mostra eles nas colunas da biblioteca. Você é livre para editar a maioria dos metadados, e o Mixxx oferece um número de diferentes formas de fazer isso. Note que algumas informações não podem ser editadas, como a taxa de bits, tamanho, duração, tipo, nome do arquivo e localização.
O Mixxx não suporta a edição de metadados de várias faixas ao mesmo tempo (edição em massa).
Mixxx won’t touch your audio files by default. Changes to a track’s metadata will be saved to the Mixxx library, but not to the track itself.
If you wish to write modified track metadata from the library into file tags, check the box in.
- Edição de Faixas na Linha
To enable inline editing in the library go to and check the box “Edit metadata after clicking selected track”.
Select any track in the library and click on the field you want to edit. If the field is editable, it will become an editable text box. Enter a value and hit Enter when you are done.
- Editor de Propriedades:
To open the editor right-click on a single track in the library or any track label in decks or samplers, then select Properties in the track menu. You can also double-click any track label in the decks or samplers to open the editor directly.
Add or change values in the editable fields, and save your changes as explained below.
OK: Aceita as mudanças e fecha o editor.
Apply: Accept the changes and leave the editor open.
Cancelar: Descarta as mudanças e fecha o editor.
Anterior/Próximo: Carrega a faixa seguinte ou anterior na visualização atual da biblioteca.
Import Metadata from File: Prompts Mixxx to re-read the metadata of the selected track (such as when you have modified it externally with another application.)
Import Metadata from MusicBrainz: Look up metadata on-line by searching the MusicBrainz database. See below.
Usando a base dados online do MusicBrainz
The MusicBrainz wizard in Mixxx allows searching the MusicBrainz database and applying the results to your tracks.
Clique em uma única faixa da biblioteca e selecione Obter Metadados no MusicBrainz. O Mixxx busca dados da faixa do banco de dados do MusicBrainz e mostra os resultados da busca.
Select the best match from the search results by clicking on it in the list.
Aplicar: Aplica os metadados selecionados no MusicBrainz na faixa.
Fechar: Fecha o assistente.
Previous/Next: Load the previous or next track in the current library view and perform a MusicBrainz lookup on it as well.
- Fetching track metadata from MusicBrainz can fail:
if Mixxx is unable to find the specified track in the MusicBrainz database,
if Mixxx cannot reach the MusicBrainz servers (if they are down),
or if you are not connected to the Internet.
The MusicBrainz service has been designed for identifying full audio files. If a track is less than 2 minutes long, identifying the file will likely fail. Identifying a layered mix-track or mash-up may produce false positives in the result list.
Using third-party software
If you have edited file metadata in third-party software you need to re-import the modified metadata into Mixxx manually by selecting the affected tracks, open the context menu, and then choose.
Rescanning the library within the menu on top of the application window will only detect newly added or removed tracks but no modifications of existing tracks. This is a known limitation.
4.7. Auto DJ - Automatize a sua mixagem
As funcionalidades do Auto DJ em detalhe:
Shuffle button: Randomizes the order of tracks in the Auto DJ playlist.
Add Random button: Adds a random track from track sources (crates) to the Auto DJ queue. If no track sources are configured, the track is added from the library instead.
Botão Pular faixa: Pula a próxima faixa da lista de reprodução do Auto DJ.
Botão Desvanecer agora: Começa a transição para a próxima faiax.
Transition time spin-box: Determines the duration of the transition. A negative value will add a pause between tracks.
Selection Info label: Displays the duration and number of selected tracks. Press Ctrl + A to get the total duration of the AutoDJ queue.
Botão Ativar Auto DJ: Liga/Desliga o modo Auto DJ.
The Skip track, Add Random and Fade now buttons are only accessible if the Auto DJ mode is enabled. The Search field in the upper left corner is disabled in Auto DJ. By default, Auto DJ removes tracks after playing them but if you want it to play the same tracks over and over again, you can activate the Auto DJ Requeue option in .
Auto DJ Crates
It is possible to add random tracks to the bottom of the Auto DJ playlist. The tracks are chosen from a set of crates that you have set as a source for Auto DJ, or from the standard library. Mixxx will normally try to select tracks that haven’t yet been played. You can set a minimum number of tracks that are always available for selection no matter when they were last played in.
Para mais informação, vá para o capítulo Auto DJ.
4.8. Playlists - Arranging tracks in a set order
Playlists are not directly loadable into decks as Mixxx is primarily intended for live, attended performance use. However, you can right-click a playlist to queue it to Auto DJ, so in a sense you can “play” it.
Create a playlist: Right-click on the Playlists sidebar item and select Create New Playlist. Name the playlist and click OK. The total number of tracks and total duration are displayed next to the name.
Import playlists: Right-click on the Playlists sidebar item and select Import Playlist. Select one or more playlists and click OK. Mixxx creates an import of these existing external playlists as new Mixxx playlists.
Add Tracks: Add tracks to a previously created playlist by dragging-and-dropping a selection of tracks from the library or playlists onto the name of a playlist in the sidebar. Alternatively, use the right-click context menu in the library’s track list.
If you have a track selected in the library, all of the visible playlist and crates that it is in are shown in bold.
Right-click on an existing playlist name to access the different features in the context menu:
Adicionar ao Auto DJ: Adiciona o conteúdo da lista de reprodução à fila do Auto DJ para mixagem automática.
Rename: To rename a playlist, just enter a new playlist name and click OK.
Duplicar: Algumas vezes você quer construir uma lista de reprodução baseado em uma existente. Selecione a lista de reprodução que você quer duplicar, escolha Duplicar Lista de Reprodução, nomeie a nova lista de reprodução e clique OK.
Remove: Removes an unlocked playlist. Tracks that were in the playlist remain in the library for later use.
Travar: Esse ícone indica uma lista de reprodução travada. Se uma lista de reprodução é travada, você não pode adicionar faixas, renomear ou deletar a lista de reprodução. Escolha Destravar no menu de contexto para destravar a lista de reprodução.
Analyze entire playlist: Forces the analysis of the tracks in the playlist in the Analyze view.
Import playlist: Import tracks from external playlists in various file formats to the selected playlist. For more information, go to Using libraries from other software.
Export playlist: Export a playlist to various file formats such as
csv. This allows you to use the data in other applications.
Export Track files: This copies all of the tracks in a playlist into a folder such as an external USB stick. Only files are copied, not Mixxx-specific metadata like waveforms or cover art that is not embedded in the file.
4.9. Crates - Organizing tracks into collections
Create a crate: Right-click on the Crates sidebar item and select Create New Crate. Name the crate and click OK. The total number of tracks and total duration are displayed next to the name.
Import crates: Right-click on the Crates sidebar item and select Import Crate. Select one or more playlists and click OK. Mixxx creates an import of these existing external playlists as new Mixxx crates.
Add Tracks: Add tracks to a previously created crate by dragging-and-dropping a selection of tracks from the library or playlists onto the name of a crate in the sidebar. Alternatively use the context menu in the library’s track list.
Clique com o lado direito em um nome de caixa existente para acessar diferentes funcionalidades no menu de contexto:
Renomear: Para renomear uma caixa, digite o novo nome da caixa e clique OK.
Duplicar: Como nas listas de reprodução, você pode duplicar uma caixa existente. Selecione a caixa que você quer duplicar, escolha Duplicar Caixa, nomeie a nova caixa e clique OK.
Remover: Remove uma caixa destravada. As faixas na caixa ainda vão estar disponíveis na biblioteca para uso futuro.
Travar: Esse ícone indica uma caixa travada. Se uma caixa é travada, você não pode adicionar faixas, renomear ou deletar a lista de reprodução. Escolha Destravar no menu de contexto para destravar a caixa.
Auto DJ Track Source: Use this crate as a source for random tracks in Auto DJ, see Auto DJ crates .
Analisar Toda a Caixa: Força uma análise da caixa na visualização Analisar.
Import crate: Import tracks from external playlists in various file formats to the selected crate.
Export crate: Export a crate to various file formats, such as
csv. This allows you to use the data in other applications.
Export Track files: This copies all of the tracks in a crate into a folder such as an external USB stick. Only files are copied, not Mixxx-specific metadata like waveforms or cover art that is not embedded in the file.
Caixas vs. Listas de Reprodução
Crates are unordered collections of tracks. Unlike playlists, they cannot contain duplicate entries and do not support arranging tracks within them.
Often DJs group tracks by genre, keep lists of favorite tracks, and/or prepare lists of tracks they want to play at a particular party. In these cases they rarely care about the order since they will choose it at the party based on the dance floor and mood. They certainly don’t want duplicates in these lists. Crates serve these purposes. You can think of them like labels in GMail or Web 2.0 tags for your music.
If however you want to plan out a specific set and practice the transitions, you will want an ordered list of tracks. Playlists serve this purpose.
4.10. Computer - Loading tracks from anywhere on your computer
Click the Computer sidebar item to navigate the computer and find your music. Depending on your operating system, your music will usually be found in the “My Music” or “Music” folder. Drag the files you want to import to the Tracks icon or directly to the Mostradores de Onda.
Currently you can only drag files (not folders) to the Mixxx library.
Right-click on a folder and choose Add to Library to add the folder as an additional music directory. Mixxx will watch this directory and its subdirectories for new tracks.
For more information, go to Changing music directories.
Para mais informação, vá para Gravando sua Mixagem.
4.12. History - Keep track of your sessions
The history section automatically keeps a list of tracks you play in your DJ sets. This is handy for remembering what worked in your DJ sets, posting set-lists, or reporting your plays to licensing organizations. Every time you start Mixxx, a new history section is created. If you don’t play any tracks during the session, it will be discarded.
Click on the History icon in the sidebar to switch to the History view, then right-click on a session’s name/date to access the different features:
Adicionar ao Auto DJ: Adiciona o conteúdo da sessão à fila do Auto DJ para mixagem automática.
Rename: Rename a session. The default is the calendar date (YYYY-MM-DD).
Remove: Remove a previous (unlocked) session. (You cannot remove the current session.)
Create new history playlist: Split off the current history session and add a new session without having to restart Mixxx. The current history must contain at least one track for this option to be available.
Join with previous: Append the selected history session to the end of the previous one.
Export playlist: Export a session in various file formats. This allows you to use the data in other applications.
4.13. Analisar - Prepare suas faixas
This section allows you to analyze your tracks in advance of loading them into a deck. Analyzing tracks requires considerable CPU power and may cause skips in the audio while performing, so it helps to have your tracks analyzed before you play. See Analise sua biblioteca for details.
4.14. Using libraries from other software
iTunes (Windows, macOS)
Traktor (Windows, macOS)
Banshee (Windows, macOS, GNU/Linux)
Serato (Windows, macOS)
Rekordbox (Windows, macOS)
The external library views allow you to use music libraries you have created in these third-party applications. You can access music as well as playlists. If available, Mixxx automatically loads the external libraries from their default locations on your hard drive.
Ao tocar uma faixa de uma biblioteca externa, ela vai ser adicionada à sua biblioteca do Mixxx.
External libraries can be disabled under.
Using the iTunes/Traktor/Rhythmbox/Bashee/Rekordbox library
Clique com o lado direito no ícone do iTunes na árvore da Biblioteca e selecione Escolher Biblioteca para carregar o
iTunes Music Library.xml de um lugar diferente. Selecione Usar Biblioteca Padrão para resetar.
Right-click on a iTunes/Traktor/Rhythmbox/Banshee playlist and choose Import Playlist to import it into a new Mixxx playlist.
If you have an iTunes configuration file (
*.xml) from a Windows or Mac partition mounted in Linux, you can load it and use your iTunes tracks and playlists as well.
Using the Rekordbox library
To read Rekordbox databases for CDJ/XDJ players on USB or SD devices, the database has to be exported to a USB or SD device with a FAT or HFS file system using the Rekordbox Export mode. Databases that have been moved to an external device via Preferences > Advanced > Database management in Rekordbox are not supported.
Plug your USB or SD drive in while Mixxx is running.
Click on the Rekordbox item in the library sidebar to scan for Rekordbox prepared USB drives. If no Rekordbox devices show up, you can click on Check for attached Rekordbox devices (refresh).
Click on the desired removable device. All your folders and playlists will be revealed for you to play from.
How Rekordbox hotcues, memory cues, and loops are imported
The following data is read:
Mixxx currently has one main cue point, one loop, and thirty eight hotcues. As such:
All Rekordbox hotcues are mapped to Mixxx hotcues as expected, the first chronological Rekordbox memory cue is mapped to the Mixxx main cue.
The first chronological Rekordbox loop is also mapped to the Mixxx loop.
All loops (including the first loop), and all subsequent Rekordbox memory cues are appended as Mixxx hotcues following the previously imported Rekordbox hotcues.
The hotcue and memory cue colors you assigned in Rekordbox are also imported, assisting in distinguishing between them.
Although additional imported Rekordbox loops only appear in Mixxx 2.3 as hotcues, their loop information is stored in the Mixxx library and will become usable in Mixxx 2.4.
Using the Serato library
Mixxx supports reading your Serato library and crates both from your local hard drive as well as portable USB drives. Smart crates are currently not supported.
Serato stores information such as hot cues, track color and beatgrid in the file tags. Regardless of whether a track is loaded into deck from the library or directly from the file browser, Mixxx will import that information automatically if present.
Saved loops are imported as well, but since Mixxx is lacking support for multiple saved loops, only the first loop is usable in Mixxx. All other saved loops can be used like regular hotcues for now.
Waveforms, Gain values and “Flips” are not imported from Serato.
Due to differences in the metadata format, importing Serato information from Ogg Vorbis files is currently not supported.
To import Serato libraries from external USB drives:
Copy music library from Serato into external USB drive
Plug in USB drive while Mixxx is running
Click on Serato in the library. All USB drives containing a Serato library will be detected automatically.
For each removable device, the library and all crates from Serato will accessible.
If you have already added a track containing Serato Metadata to your Mixxx library in a Mixxx version that didn’t support reading that data, you can reimport it from the file’s tags via the track context menu.
This action will clear your existing cuepoints in Mixxx if the file contains Serato Metadata
To reimport metadata from files:
Right click on the track to show the context menu
Decoders may slightly detect different track start and end times for files from different sources, this could possibly be because of the presence of countless encoders and decoders for MP3 and M4A/AAC. This problem may cause your cues to be shifted up by a few milliseconds. Mixxx might not always be able to mitigate this problem, but it’s possible to shift all cues for a track at once as a workaround.
4.15. Removing tracks from the library
Removing tracks from the Mixxx library will not physically delete them from your drive. However it does delete extra metadata Mixxx might have (such as hotcues and the beatgrids), and removes links to playlists or crates.
Click the Library item in the sidebar.
Find and select the tracks you want to remove, perform a right-click on them and select Hide from Library from the context menu.
Expand the Library item in the sidebar and click on the Hidden tracks sub-item. All tracks that were set to be hidden from the library will appear here.
Select the tracks you want to remove, or use the Select All button.
To confirm you want to permanently remove these tracks from the library, click Purge.
If you later decide to add some of the deleted tracks back, import them to the Mixxx library again, see Changing music directories.
4.16. Compatible file formats
Mixxx supports a variety of audio file formats:
Ogg Vorbis (ogg)
Aiff (aiff, aif)
AAC (aac, m4a, mp4)
Lossless formats preserve every detail of the original recording and are
recommended for the best sound quality. The
FLAC format compresses the
files to take less space on your computer without sacrificing audio quality.
AIFF files are uncompressed and take up much more space.
Lossy formats take up less storage space on your computer than lossless
formats at the expense of reducing sound quality. Assuming an average track
length of about 4 minutes, a 1 TB hard drive or solid state drive can store
FLAC files or about 115000
MP3 files at 320 kbps.
There is no benefit to converting lossy file to lossless formats. The detail lost when making the lossy file cannot be recovered.
AAC (M4A) is supported on Windows Vista and macOS 10.8 onwards. The
Platform Update Supplement
is required for Windows Vista.
AAC playback is disabled by default due to licensing restrictions.
To enable the playback of
build Mixxx from source with m4a/AAC files support.
DRM protected files, such as m4p files purchased in the iTunes Store in 2009 or earlier, are not supported.
ALAC files use the same container MP4 container format and file extensions (m4a, mp4) as AAC files, but Mixxx cannot play ALAC files. It is recommended to convert ALAC files to FLAC for use in Mixxx. This will not reduce the sound quality of the files.
4.17. Music from audio CDs
Mixxx can not play music directly from audio CDs. Use a CD ripping program to
copy the audio from the CD to files on your computer. It is recommended to
save the ripped files in the FLAC format. Many different programs are
available to rip CDs, but not every program is capable of saving them to