Acceptable Music Upload Types for Digital Distribution Tunecore
Article Content
This is an overview of master audio file formats yous'll need depending on how you plan to release and distribute your music, and how well yous want to optimize your audio for a given format.
Apple tree Music/iTunes Store, Spotify, Amazon Hard disk drive, TIDAL, and Other Online Stores/Streaming Services
File Format: 24-bit/44.1k Sample Rate (or college) WAV Files
I first wrote this article in 2014 and every bit of 2021, I can now say that there is really only one master digital distributor that yet has an arbitrary limitation of sixteen-bit/44.1k WAV files, and that is CD Baby. The residuum of the digital distributors/aggregators now accept college resolution files which is swell, specially equally streaming services are starting to offer lossless and high resolution streaming.
Other than CD Baby, the rest of the main digital distributors such as DistroKid, The Orchard, and TuneCore all accept 24-bit WAV files, and they can be higher sample charge per unit files than 44.1k if bachelor from the mastering session. There are a growing number of smaller bazaar distributors/aggregators besides, likewise many to keep track of. They should all accept their file specifications listed on their website simply nigh all of them now accept 24-bit/44.1k (or college) sample rates which is great.
Master WAV files should come directly from the mastering session, and should take never been on an audio CD or in mp3 format. They should not exist altered in any way after being reduced to 24 or sixteen-chip and should exist ready for distribution "as is". If changes are needed, it'south ever best to contact whoever did the mastering then these changes can be made from the best possible source, and checked once again for quality and accuracy before being uploaded.
These files volition be submitted to an aggregator (distributor) such equally DistroKid, CD Baby or Tunecore, to distribute your music to a variety of online stores and streaming services of your selection. Be aware that if ample tiptop-headroom is non present on these WAV masters, yous may experience clipping or overs when the masters are converted from WAV to AAC, mp3, and other data-compressed formats used by most online stores and streaming services. The old standard of -0.2dB tiptop headroom from the CD era is usually not plenty to prevent potential issues downstream. More on this beneath.
But be aware that if you do submit college sample rate WAV files, in some cases, the audio will be reduced to 44.1k sample rate by the streaming service. In that location is no way to make a blanket statement almost whether this is good or bad because it will vary from service to service depending on the software and practices used to do that. Even so, as lossless and high resolution streaming is becoming more mutual, those who are serious almost audio fidelity may desire to upload the highest sample rate principal WAV files they take available from the mastering session. If you are self-mastering, this doesn't mean you should export your chief files at the highest sample charge per unit your DAW/audio software allows (usually 192k), this means you should simply keep the audio at the same sample rate equally the recording, mixing, and mastering session if it'due south higher than 44.1k. There is no need to reduce to 44.1k just for digital distribution anymore.
Others do not trust streaming services to properly downsample the audio when needed and argue that submitting 16 or 24-flake/44.1k WAV is best, or at least safest because the mastering engineer will have ideally used the best sounding sample rate conversion they have available. I personally recall we're at a point where it is safe in most cases to upload sample rates higher than 44.1k if available which aside from likely sounding meliorate when streamed in mp3/lossy formats, also means your project will be available to stream in high resolution for those who want to, if their streaming service of option offers it.
One concerning thing about DistroKid is that they also accept mp3 files as masters, which is not adept. Even if the mp3 (or AAC/m4a) file that yous submit sounds OK, it volition surely sound bad after it'south reduced in quality again (known as transcoding) past the streaming service or digital retailer. Ordinarily the most obvious issue is swirly and garbled sounding high frequencies. This is why it's of import that you're submitting true WAV files that accept never been reduced to mp3/AAC/m4a or other low quality formats.
TIDAL: At the time of this writing, some songs and albums on TIDAL are available in "Master Quality", pregnant TIDAL users can stream loftier-resolution versions at sample rates higher than 44.1k in a propriety format chosen MQA. The ability for independent artists to participate in MQA is severely limited, and many mastering engineers are still in the night about this process. At this fourth dimension, nosotros are in the very early on stages of MQA and information technology remains to be seen where it will go, or if it will catch on. To learn more than almost MQA, click here.
Later watching THIS video, you may be skeptical of MQA.
DistroKid now offers an option for independent bands/artists to have their album available every bit MQA. As loftier resolution and lossless streaming from Apple Music, Amazon, and others becomes the norm, I think MQA will slowly fade abroad.
Apple Digital Masters
File Format:24-flake/96k, 88.2k, 48k, or 44.1k Sample Rate WAV Files
Some distributors offer Apple Digital Masters (formerly Mastered For iTunes) versions of releases. This means you can submit 24-flake WAV files, at sample rates higher than 44.1k to your distributor for them to pass on to Apple Music. Apple Digital Masters is not a completely separate main, it'south based on your main digital master just with a few adjustments to optimize specifically for the Apple Music AAC format. The primary files must follow other guidelines specified past Apple that certified "Mastered For iTunes" mastering studios are aware of. You must use an Apple approved mastering studio in order to be eligible for an official Apple Digital Masters release. You may take to fix up and pay for a separate Apple Digital Masters version of your release. Cheque with your online distributor/aggregator for specific details.
As loftier resolution and lossless streaming from Apple Music, Amazon, and others becomes the norm, I recollect Apple Digital Masters will slowly fade away as most of this specification and concept is covered past simply submitting 24-chip and college sample charge per unit master files which can hands exist done now. This wasn't the case years ago when Mastered For iTunes/Apple tree Digital Masters was conceived which is why it was unique at the fourth dimension.
Bandcamp & SoundCloud
File Format: 24-flake/44.1k Sample Charge per unit (or college) WAV Files
Files uploaded to Bandcamp and SoundCloud can be 24-bit, and at higher sampler rates than 44.1k if bachelor from the mastering engineer, which could make for better sound quality on the resulting data-compressed files such as mp3s. You can likewise allow users to download your original college resolution masters, or data-compressed mp3s of smaller size if they prefer. Be aware of possible clipping and overs that can occur after conversion to mp3 and other information-compressed formats past these websites and services. More info on this below.
Compact Disc (aka CD)
File Format: DDP Image or Audio CD-R Master
A DDP image (aka DDP file or file set) is the best, quickest, and easiest way to transmit a CD principal to the CD manufacturer from a mastering engineer's standpoint. A DDP primary tin be easily sent via the Internet, but some modest duplication orders may still crave a physical sound CD-R master. A CD-R master is ideally burned past your mastering engineer and then tested for fire/write errors before aircraft to the CD manufacturer. Cheque with your CD manufacturer to see if DDP works for them (because they are widely considered to be more reliable than CD-R), or if a concrete CD-R principal is needed. More info on DDP is plant below.
Vinyl
File Format: 24-bit WAV Files (sample rates higher than 44.1k if available)
The WAV files for your vinyl pre-master can be at the native sample rate of your original mixes and/or mastering session (meaning higher than 44.1k/CD quality). Creating a single WAV for each side of the record volition ensure that no changes with the infinite and timing between songs can occur at the lacquer cutting stage. Most lacquer cut engineers and pressing plants seem to prefer receiving ane file per album side, but not all. Sonic adjustments are frequently made by the digital mastering engineer to optimize for the vinyl format before sending it off to the pressing plant or lacquer cutting engineer.
This procedure can make or intermission the sound quality of your vinyl. Mostly speaking, while it can be done, loud digital masters practise not interpret well to vinyl then it's usually a swell idea to take a special vinyl pre-master fabricated. What usually doesn't work is sending your digital master files to another mastering engineer to master them for vinyl, or make them more vinyl friendly.
Your original digital mastering engineer should be familiar with how to optimize the audio of your vinyl pre-master for the lacquer cut (or DMM) engineer to do their all-time work. If not, finding a digital mastering engineer that has the feel preparing vinyl pre-masters would be benign. At that place are a lot of variables related to vinyl audio quality, and so working with engineers familiar with the process is highly recommended. More info here.
When sending a WAV file for each side of the album, it'due south also of import to provide a cue canvass for each vinyl side, so the cutting engineer knows where to place the visual "bands" that point where each vocal starts on the vinyl itself. Most mastering software (due east.m. WaveLab) can create a PDF report to indicate where the rails markers are located for both sides of the vinyl, which is essential.
Cassette
File Format: 16-scrap WAV Files (sample rates higher than 44.1k in some cases)
Most cassette manufacturers usually ask for 16-flake/44.1k audio though some boutique articles may exist able to piece of work with higher bit-depth and sample rate audio files. Creating a unmarried WAV for each side of the cassette (or "programme") will help ensure that no changes with the space and timing between songs can occur.
When sending a WAV file for each side of the cassette, it's besides important to provide a cue canvas for each side/programme, so the manufacturer knows what is intended to exist on each side/plan of the cassette. Well-nigh mastering software can create a PDF report to point where the track markers are located for each side/program of the cassette.
It's difficult to optimize the audio for cassette in bang-up item because the mastering engineer is rarely aware of what blazon of cassette tape is existence used for a given project. That being said, THIS is a nifty overview of mastering for (or to) cassette in 2021 and beyond.
Download Cards
File Format: mp3 (or whatever y'all desire users to download )
This is one situation where mp3 files are usually preferred when it comes to delivering your masters. Near download carte services simply host the files you deliver to them and don't do any further conversions or information compression like the streaming services do. Check your download card service for specifics.
It'south a good idea to fully tag your mp3 files with metadata and then that when people download the files, they tin see all this info and artwork as they commonly would if they purchased the songs from a digital retailer. Most mastering engineers can easily practice this from their mastering software if you provide the info to them ahead of time.
I've too found that my mastering clients like to receive reference mp3 files with all the metadata and artwork embedded to employ for sharing straight with friends, family unit, and for promotional use so mp3s have become a part of my standard delivery in one case a projection is approved.
Some audiophiles may prefer to have the option of downloading high-resolution WAV or FLAC files but typically, the average listener/fan would like mobile friendly mp3 files to download.
YouTube
File Format: 24-chip/48k WAV files or 24-bit/44.1k
This is a tricky one. Nearly video editors piece of work at 48k considering this is more or less the standard for video production. However, YouTube suggests that audio for music videos exist delivered at 44.1k and 24-scrap. sixteen-bit is acceptable but 24-scrap will likely produce a better end result. Also, depending on the playback device, the audio might play back at 44.1k, or 48k sample charge per unit.
This ways that your audio is likely to have the sample rate converted at some point after information technology leaves the mastering studio. The important takeaway here is to minimize the corporeality of sample rate conversions your audio volition be subject to past delivering masters at the same sample rate the video editor volition work at. You want to avert having the video editor convert your 44.1k WAV masters up to 48k using subpar video software, only to take information technology become back down to 44.1k in some cases.
Be mindful of the commitment specs for YouTube (or whatever video platform you are using) when the video editor makes their final consign. Avoid using mediocre sample charge per unit conversion algorithms that are often found in video editing software, or basic DAWs similar Pro Tools, Logic, etc. iZotope RX has nifty sample rate conversion, and virtually mastering engineers have "mastering grade" sample rate conversion software which can produce better results.
Because your audio for video is likely to meet some sample rate conversions and data-pinch, I highly recommend leaving a full dB of pinnacle-headroom for loud/dumbo music to avoid any clipping or distortion due to the conversion processes. Some people brand the statement of making a less limited version for video use since YouTube will pass up loud music videos anyhow, which you lot tin can cheque Hither.
If y'all are determined to achieve the best audio quality on YouTube, I advise reading this forum thread that gets into the finer details.
Side Notation: I've mastered a number of songs where upon checking the video, the audio is in mono, or the level has changed for some reason. Video editors are not e'er audio wizards and sometimes when they import the mastered audio or export the final video, things can go incorrect. If you accept the take a chance, I suggest checking the master video file before information technology gets posted for any audio bug.
Instagram/Facebook/Social Media
Much like YouTube, the variables for nearly socials media posts are kind of a mess but at this fourth dimension, the audio is unremarkably converted to mono in a careless way on social media services/apps. This means that sound mastered very loud (which is most modern music) can very hands distort and sound bad on social media.
If you lot are using social media to heavily to promote and share your music, I highly recommend reducing the level then the peaks are no louder than -3dB. You may want to check your mixes and masters in mono to come across how this translates.
I too suggest checking the audio of your video/mail service right away to make sure information technology sounds acceptable earlier others start to hear it.
Music Licensing
File Format: 24-bit/48k WAV files (with 320kbps reference mp3)
The proper format needed for licensing your music will ultimately depend on who licenses the music, and/or how you plan to distribute it. Withal, the most mutual sound format for video utilize is 24-bit/48k WAV, though 24-bit/96k is condign more than common certain types of releases. Although the audio tin be resampled down the line as needed, if you're serious about submitting your music to be licensed in video productions, you'll want to ask your mastering engineer for 48k WAV versions of your masters. This is especially true if y'all have too mastered instrumental versions of your songs, which most commonly get licensed.
Acquiring 48k versions of your masters and instrumentals from your mastering engineer should ensure the best sound quality equally the audio is less likely to be resampled or converted down the line with potentially subpar sample rate conversion software. Information technology's also useful to have reference mp3s of your instrumentals for easy sending and auditioning of your music by potential licensing clients and music supervisors.
Having metadata embedded in your WAV (and reference mp3 files) can also exist critical when used for music licensing and so that whoever is using, or because using the material has admission to potentially disquisitional details such as ISRC codes, songwriting, publishing, etc.
Exceptions & Notes
Always offset with the highest resolution file available and acceptable for the format in which you are distributing your music. Upward-sampling a 44.1k WAV file to 96k does not add any sound quality to your file and can actually make it audio worse if done using non-mastering course software. Converting an mp3 to WAV does not "add the full resolution back". In one case a file size is reduced and encoded to mp3 or AAC, you must go back to the source to retain the quality of your original master.
You should non convert mp3s into WAV files in order for them to be used for online distribution. Once a WAV file has been reduced to mp3 or AAC, the integrity and sound quality is gone forever. An mp3 is to audio as a grainy, pixilated image is to photography. One time the data is stripped from a high-resolution file, it cannot be brought back.
Fifty-fifty though you tin can technically convert an mp3 back into a WAV file, you will still accept a loss in quality compared to the original WAV file. This loss of quality is particularly noticeable in the high frequencies, resulting in a swirly, underwater audio depending on the size and bit-rate of the mp3. Fifty-fifty if y'all don't notice these artifacts on well-encoded mp3 or AAC files, you lot will certainly notice problems when the mp3 or AAC file you converted to WAV gets converted back to mp3 or AAC over again by the streaming service, iTunes Shop, Bandcamp, SoundCloud, etc.
The same is true regarding 24 and xvi-bit files. One time a file is reduced to 16-bit, it tin can't be successfully converted back to 24-bit. The data is lost. This is why the files y'all receive from your mastering engineer should require no further processing or adjustments. They should exist 100% ready for distribution and production "as is".
File tagging and online distribution: Technically, WAV & AIFF files tin contain a fair corporeality of metadata also as the artwork, simply the ability for most consumer software and media players to read that metadata and artwork is limited. After your mastering engineer provides WAV files for uploading to online distribution and streaming services, even if they take tagged those files with metadata, expect to submit the artwork and other metadata separately equally yous submit the audio files for online distribution. The distribution service you utilize volition handle the metadata tagging that is seen by the end user based on the info you enter, and what is supported by the end file format. Some services such as TIDAL and Spotify are starting to show performance and production credits which is overnice.
Each private shop and streaming service has its own file specs for files that the end user purchases or streams, but they are all usually generated from the same WAV file that y'all submit to your aggregator. With most aggregators, you can choose to distribute your music via iTunes Store/Apple Music, Amazon, Qobuz, Spotify, TIDAL, and the list keeps growing. There'due south no reasonable way to optimize your audio uniquely for them all, but yous and/or your mastering engineer tin take care to be sure your mastered WAVs are optimized for the primary stores which should interpret well to nearly all.
The nearly universal concept is to leave plenty peak-headroom to avert clipping later the streaming services convert your master WAV files to a lossy format (mp3, AAC, etc.). Most mastering engineers are now familiar with this concept but for those who are cocky-mastering, or not familiar with this concept, here are a few tips:
Leaving up to a full decibel (dB) of pinnacle-headroom on your chief WAV files tin can help forestall clipping and overs when the WAV masters are reduced to a data-compressed format, which is inevitable. In that location are tools such as Sonnox Pro Codec to help you know how much headroom yous'll need to leave on your files to avoid clipping. However, setting the output ceiling of your limiter to -1dB, -0.5dB, or somewhere lower and then 0dB is probably a good residual between safety and loudness for nearly applications.
That existence said, a lot of big releases and loftier profile mastering engineers are not doing this and just letting the chief WAVs striking 0dB. Whether or not you lot can hear the baloney when streamed or if it's a bad thing is subjective. However, from a technical standpoint, if yous desire to avoid any clipping or potential distortion when the master WAV files are converted to lower quality sound for streaming, a little headroom can assistance.
Some pop aggregators in the US are The Orchard, CD Baby, DistroKid, and Tunecore. You upload your master WAV files and project details to the aggregator merely one time, and they have care of the details regarding getting your music into the distribution channels of your choice.
DDP (Disc Description Protocol): A DDP image is basically a digital prototype of a compact disc that contains all the audio, track IDs, CD-Text, and ISRC codes. DDP is non prone to errors that can occur with physical CDs (and CD-Rs) such every bit skips, scratches, and read/write errors. This is in office why information technology'due south best to utilize a DDP image for your CD product master rather than a physical CD-R. Almost professional person mastering software tin export a mastered project to DDP format very easily. The DDP can be sent in for CD production via the Internet, either past uploading to the website/FTP of the CD manufacturer or by providing a direct download link to your salesperson.
DDP is too useful for auditioning a concluding master to be sure you lot're hearing the exact sound quality and song/track sequencing equally intended by the mastering engineer, considering it rules out any errors that can often occur when working with individual WAV or mp3 files and manually assembling them in iTunes or other consumer media players. Virtually audio playback and CD burning software programs have settings for calculation extra space between tracks, and some programs take settings that can alter the audio quality and overall levels which can exist easy for users to overlook, resulting in an inaccurate listening experience.
It is not recommended to submit private WAV files for CD product. This tin can lead to problems with song sequencing, wrong CD-Text, lack of CD-Text, and in some cases the audio itself tin can be contradistinct if files are handled improperly.
It'south easy these days for mastering studios and engineers to provide a costless DDP Player with a DDP chief in order for clients to audition and approve a master on their Mac/PC, or iOS device. This is platonic because the listener will be listening to the exact same file that would exist used for CD replication and about online distribution services.
HOFA makes a DDP Player that can be purchased for roughly $ten (USD) which is suggested if the mastering engineer can only supply a DDP prototype, just non a costless player to audition the DDP. DDP is especially useful when the mastering engineer and client are not in the same location because a DDP file can exist transmitted via the Net quite easily.
Notwithstanding, most mastering engineers will supply a DDP file with a gratis DDP Player for approval.
ISRC (International Standard Recording Code): An ISRC code is a digital fingerprint for each of your songs which helps continue track of airplay and other ways your music tin can generate royalties and credits. ISRC codes are not essential for CD and vinyl releases, but your songs volition demand ISRC codes in order to be sold on the iTunes Store, likewise equally other online distribution channels and streaming services.
Some aggregators can generate ISRC codes for you if needed when you set up upwardly online distribution. Yet, if y'all are also doing a CD release, y'all may want to have the ISRC codes generated earlier finalizing your CD master so the codes can also exist on the physical CDs. Some mastering studios offer ISRC code generation, and y'all can apply via the ISRC website to be able to generate your own ISRC codes if you prefer. Fees may apply depending on your method of performance.
Vinyl: Ideally, your vinyl pre-principal is one 24-bit (or 32-bit floating indicate) WAV file for each side of the record, at the native sample rate of your mastering session. Some vinyl manufacturers may request that your sound masters be sent on an sound CD-R.
Audio CD-R is limited to xvi-flake/44.1k sample rate, and is generally not a proficient way to submit, transfer, or store a primary. Only use an sound CD-R for vinyl product if absolutely necessary due to manufacturing limitations. It'southward recommended to use a manufacturer and/or lacquer cutting engineer that can work directly with your 24-fleck/native sample charge per unit WAV files for vinyl projects.
Using a 3rd party lacquer cutter can greatly improve your final production. Lacquer cutting is the first and arguably the most of import step in the vinyl procedure afterward your main leaves the original mastering studio. Yous typically have a more open line of communication with a tertiary party lacquer cutting engineer vs. an in-house lacquer cutter at a pressing establish. This is a large reason why results are typically better when using a 3rd party lacquer cutter. It's also much cheaper and quicker to fix issues with your vinyl pre-master at the lacquer cutting phase rather than at the examination pressing stage if problems arise.
Typically, when working directly with a pressing plant for your entire vinyl gild, yous don't get to hear anything until the test pressing is ready, which is essentially the last one/3 of the vinyl process. This means that any fixes will likely crave major dorsum-tracking and could be costly and filibuster your order.
When using a tertiary party lacquer cutter, once you approve the reference lacquer, the production lacquer(southward) are cut and shipped off to the pressing establish of your choice for the residue of the process — possibly with a stop in between for metallic plating depending on who you are working with for the bodily pressing. Using a "ane-stop store" or broker for vinyl can certainly be easier and less overwhelming, but you tend to run into a wider diverseness of audio quality depending on who you choose to piece of work with. If using a broker for a vinyl order, it's a good idea to enquire who is doing the lacquer cutting and tape pressing to be sure they are using one of good quality.
You lot will also want to be aware of how long your sides are for vinyl releases. Depending on the size of the record (7", 10", or 12"), and the speed (RPM), you will be limited to how long each side can be before the sound quality starts to be compromised. With vinyl, in that location are no hard time limits as nosotros have with a compact disc. Each pressing constitute and lacquer cutter has their ain suggested maximum times for sides, but generally speaking, sides will sound better the shorter they are, and short sides can commonly be cut louder than long sides. Long sides are susceptible to baloney (inner groove distortion), graininess near the cease of the sides, and the overall level of the sides will likely be on the tranquillity side. Some manufacturers will not guarantee sound quality after exceeding a certain fourth dimension.
THIS is my favorite guide for suggested vinyl run-times.
For the vinyl pre-principal, it may be worth removing songs from your album or shortening some songs to avert long sides. The longest side normally determines the overall level and tone of the entire tape, so creating the shortest, most even sides will produce the best results in most cases. Low-frequency content too plays a role in how loud the record can be cut. About digital mastering engineers are knowledgeable about what will work and what won't when information technology comes to depression-frequency content and volition commonly make adjustments to the low end besides as whatever high-frequency bug such every bit vocal sibilance or overly vivid cymbals.
Skilled lacquer cut engineers can sometimes produce practiced sounding records at long lengths, but the results unremarkably vary depending on the source textile and person doing the cut work. Maximum times for sides are posted for a reason and should exist taken seriously if you intendance about the audio quality of your vinyl.
You tin can read an article I wrote most the importance of lacquer cut for vinyl past clicking here.
Apple Digital Masters: Only mastering studios that have been certified by Apple are allowed to provide masters for Apple Digital Masters releases. What Apple Digital Masters means is that your digital distributor is submitting your mastered WAV files to the Apple Music at 24-bit, and the highest sample rate available for your project. Up-sampling a 16-scrap/44.1k main to 24-chip/96k will non be beneficial, only if your mastering engineer tin provide high sample rate, 24-bit masters, an Apple Digital Masters release may be worth considering.
The other important step in the Apple Digital Masters process is that the chief is auditioned through a special encoder to exist sure that it volition not clip or incorporate overs when converted to AAC for distribution via Apple Music. Without leaving the proper corporeality of headroom on loud digital masters (equally nearly are these days), information technology'southward adequately piece of cake for clipping or overs to occur when your loud mastered WAV files are converted to AAC, or other compressed formats such every bit mp3.
The severity of the clipping that occurs depends on the material, how loud it's mastered, and other variables controlled past the mastering engineer. This is why conscientious testing must take identify for each song inside each project to qualify equally Mastered For iTunes uniform. Every 2d of every song must be analyzed through the encoder to test for overs and the proper headroom must be gear up to avert these overs throughout the course of the song, or complete album. Offline encoder checking via Sonnox ProCodec is, in my opinion, the best way to check for post-encoding overs with repeatable results. Using tools that run in real-time on playback practise not provide repeatable results when it comes to overs.
The most common method to prevent clipping and overs when your mastered WAV files are converted to a compressed format, is lowering the output ceiling of the final limiter in the mastering session to a sure point in social club to leave enough headroom for the file conversion and information compression procedure. Back when CDs were the main digital format, the standard setting for a digital limiter'southward output ceiling was -0.2dB, to prevent distortion with cheaper CD players and playback components. It was somewhen discovered that -0.2dB is non plenty headroom to prevent clipping when loud masters are converted to compressed formats such equally mp3 and AAC. It'southward condign more than popular to lower the final limiter output ceiling to as low as -1.0dB to prevent clipping and overs when the file is converted to a compressed format. Over again, the actual clipping instances volition depend on the variables of the material and how information technology's mastered. Typically, you desire to lower your output ceiling as little as needed, merely merely plenty to forestall these overs when converted to mp3 or AAC. The optimal setting is dependent on your specific fabric and the target compressed format. Lower quality mp3s tend to prune more than easily than higher quality mp3s.
In that location are a variety of tools that a mastering engineer can use to know how a master will react to a sure mp3 or AAC encoding. Some popular options are Sonnox Fraunhofer Pro-Codec, Sonnox Codec Toolbox, the Encoder Checker that is now built into WaveLab, iZotope Ozone, NUGEN MasterCheck Pro, too as tools and droplets provided for complimentary by Apple tree. However, the tools provided by Apple are Mac/OSX only. The Sonnox ProCodec plugin comes in in VST, AAX, RTAS, and AU formats so they can run inside a number of audio software applications on both Windows and Mac OSX. Sonnox Codec Toolbox has standalone version too that can run on its own outside of any other audio software. This is my preferred method of testing because of the offline encoding pick which gives you lot 100% repeatable results.
If you exercise not wish to do an official Apple Digital Masters release, it doesn't hurt to comply with as many of the guidelines every bit possible. Fifty-fifty if you lot only choose to submit xvi or 24-bit/44.1k WAV files to your distributor/aggregator, you can still have your mastering engineer be certain that in that location is plenty headroom in the WAV files you submit to avert clipping and overs after the lossy encoding process. This can result in a more pleasing sounding file for the stop user that purchases or streams your music via Apple Music, equally well every bit other stores and streaming services.
The Apple Digital Masters theory tin exist applied to most of the online distribution channels as well. However, it'due south non always clear what format your WAV file gets converted to after you upload it. In that location is non a realistic manner to test exclusively for all the various encoders your music could encounter. It'southward important to communicate to your mastering engineer, how and where you program to distribute your music, and read the fine print on the file specifications for any given distribution service.
Why doesn't iTunes recognize my CD info?
If you're wondering why iTunes or other music playback software on your computer volition non recognize song titles, artist proper name, anthology name, cover art and other info when you lot insert your audio CD, please see this article.
Source: https://theproaudiofiles.com/audio-mastering-format-and-delivery-guide-2014/
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