Some DNLA software aka. UPnP software includes the ability to 'transcode' video and/or audio files from one format to another. So if you have a mixture of DNLA clients which do not all support the same format it can convert the files for those that need it. You may want to take this in to consideration when choosing a DNLA package for your Mac.
If you are running on Mac OS X(Mavericks), iMedia Converter for Mac is the alternative. NLNA- What You Need Know - How does DLNA work? There are two main types of DLNA products: DLNA servers, such as PCs or a networked storage device, and DLNA clients. You need one of each to stream content using DLNA. Universal Media Server is a DLNA-compliant UPnP Media Server Universal Media Server supports all major operating systems, with versions for Windows, Linux and Mac OS X. The program streams or transcodes many different media formats with little or no configuration. Serviio is a free media server for Window, Mac and Linux. It enables streaming video, audio and images to your DLNA certified device. Media server free download - PS3 Media Server, Plex Media Server, VLC Media Player, and many more programs. Play various media on your Mac in the highest quality possible.
Before I get on to DNLA I would say that DNLA is old, poorly supported, poorly featured and I would advise if possible to avoid it. There are other approaches which you may decide are better for you but if not then move on to the DNLA answers below.
Firstly, other non-DNLA approaches. The premier approach for doing multi-room audio is to buy a Sonos system. With this you either buy Sonos speakers e.g. Play:3 or you buy a Sonos Connect which allows you to plug in to an existing amplifier. Sonos supports all the audio formats supported by iTunes including Apple Lossless which is going to be the best format to use if possible. While Sonos is the market leader there are other brands offering similar solutions. Examples of other similar systems to Sonos include Logitech Squeezebox, Roku SoundBridge (discontinued), an Apple TV3 or TV4, etc. All these support Apple Lossless and all allow different rooms to play different tracks at the same time.
A second approach is to use Apple's AirPlay standard, many AV Receivers now support AirPlay if you have a network interface on your AV Receiver which these days is either standard or an option on most. iTunes would then stream directly to the AV Receiver using the AirPlay standard.
A third similar approach is to get one or more AirPort Express WiFi base-stations, these have an audio out connector, you AirPlay from iTunes to the AirPort Express and it outputs via its audio connector to the attached audio device which could be speakers or an AV Receiver.
Now there is a limitation with AirPlay, a single iTunes can only output via AirPlay the same content to one or more AirPlay destinations, if you want to play multiple different music tracks at the same time then this is where Sonos and similar solutions win hands down. The iTunes however can be a Mac, or Windows, or an iPhone, or an iPad.
Moving on to DNLA. You are probably going to find many DNLA servers for the Mac are either discontinued, or semi-discontinued in that they have not had a recent update and therefore may have problems with newer versions of OS X, or only work with some clients, or do not do Transcoding well or at all. In other words like DNLA as a whole it is rather a mess. You will therefore find that you may have to buy a commercial DNLA package although this will be still cheaper than say buying a multi-room Sonos setup. I would advise testing the trial versions, make sure to remove each before trying the next.
With no particular sentiments, have a look at the following.
Say Hello to AirPlay + Google Cast
AirServer is the most advanced screen mirroring receiver for Mac and PC. It allows you to receive AirPlay and Google Cast streams, similar to an Apple TV or a Chromecast device.
AirServer turns your Mac into a universal mirroring receiver, with the exception of Miracast, allowing you to mirror your device's display using the built-in AirPlay or Google Cast based screen projection functionality; one by one or simultaneously to AirServer.
Users can mirror or cast their screen from any AirPlay or Google Cast compatible device such as an iPhone, iPad, Mac, Android or Chromebook. Windows and Linux platforms are also supported using the screen casting sender built into the Google Chrome browser.
Bring Your Own Device
AirServer introduced the world’s first BYOD solution by implementing all the major mirroring technologies giving everyone the freedom of choice for the device they wish to use.
Ultra-high quality recording
AirServer helps you create professional videos of your mirroring sessions in stunning quality. Showcase your iOS apps and games or archive your classroom collaboration in the best quality possible.
AirPlay + Google Cast
AirServer for Mac builds upon its existing AirPlay receiver functionality, including iOS 12 compatibility, and adds Google Cast receiving capabilities.
AirPlay from the YouTube app
AirServer for Mac once again supports this feature. Besides Apple TV, AirServer was the first application to provide this feature.
Chromebook Compatible
AirServer supports both tab casting and desktop casting which is built into all Chromebooks and all desktop platforms with Google Chrome browser.
Android Compatible
Dlna Server Mac Itunes
Works with all Google Cast enabled Android devices. Devices that do not have the cast functionality can enable this by downloading the Google Cast app.
Dlna Upnp Media Server
Live streaming to YouTube
YouTube Live certified, AirServer will enable you live stream your iOS gameplay with unique picture-in-picture webcam support. Teachers can also use this powerful technology to live stream their lectures.
Dlna Servers For Mac Windows 10
Retina quality mirroring
AirServer provides drastically improved picture quality during mirroring. Starting with iPhone 6 Plus, iOS devices can now mirror at full 1080 x 1920 resolution, which is over 3x the previous pixel count.
Encrypted AirPlay
AirServer protects your personal photos and videos as they are transmitted over the network. This important security feature is only offered by AirServer and the Apple TV.
iOS 12 Compatible
Dlna Servers For Mac Os
AirServer has maintained AirPlay compatibility since iOS 4.2.1 and has pushed out free compatibility updates with every major version of iOS since 2011.
Best Dlna Server For Mac
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“Faculty and students also utilize AirServer which enables the display and sharing of iPad content in the classroom.”
“AirServer turns your Mac into a AirPlay receiver, letting you stream audio, photos, and even videos to your computer, right over the air.”
“AirServer is clearly a more complete solution for all kinds of AirPlay streams with dedicated features for audio, video, and Mirroring.”
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“AirServer for Mac, one of our favourite AirPlay receivers, features long-awaited HD recording with post processing filters.”
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“AirServer app clearly blows away all the competition.”
“With AirServer you can take advantage of the better audio and visuals of your Mac by using the app to transform it into a Apple TV type of device that can be used to stream audio and video.”
“AirServer is so easy to use, we wonder why Apple didn’t implement it themselves.”
“With AirServer running, you’ll see your Mac show up in your iPad’s AirPlay menu, and you can just select it to play back video, movies or games on the big screen. It even supports mirroring so you can use it with apps that don;t yet support AirPlay properly.”