Modern multimedia content requires flexibility, and being tethered to a desktop monitor or laptop screen often becomes inconvenient. It's much nicer to enjoy movies on a big screen while lying on the couch, but there's no desire to fiddle with HDMI cables. Fortunately, wireless data transmission technologies have advanced to the point where transmitting heavy data video files occurs without delays and loss of quality.
You don't need advanced engineering skills to implement this scenario, but it's important to understand the differences between simple screen mirroring and media streaming. In the first case, the TV becomes a second monitor, mirroring everything that's happening on the desktop; in the second, it acts as a standalone device, playing files directly over the network. The choice of method depends on your goals and the technical specifications of your equipment.
In this article we will cover the main protocols such as DLNA, Miracast And AirPlayWe'll also explore software solutions for Windows and macOS operating systems. You'll learn how to set up a network for stable data transfer and what nuances to consider to ensure your movie doesn't cut out mid-stream.
Hardware and local network requirements
Before you begin setting up, you need to make sure your infrastructure is ready to transmit video streams. A fundamental requirement is the availability of Smart TV or a set-top box connected to the TV that supports wireless protocols. If your TV is a few years old but not "smart," an external adapter, such as Chromecast or Apple TV.
The quality of the WiFi connection is critical. For high-resolution video transmission (Full HD or 4K), the standard 2.4 GHz band may not be sufficient due to its limited bandwidth and noise. The ideal option is to use a frequency 5 GHz, which provides higher speed and stability of connection.
Both devices—the computer and the TV—must be on the same local network. This means they must be connected to the same router. If your computer is connected via a LAN cable and your TV is connected via WiFi to the same router, this is also considered the same network and will work correctly.
⚠️ Note: Using guest networks in routers often isolates devices from each other for security reasons. To stream video, ensure both devices are connected to the main network, not the guest network.
Using DLNA technology for streaming
Protocol DLNA (Digital Living Network Alliance) is one of the oldest and most widespread methods of transmitting media content. Its main advantage is that it doesn't require screen mirroring, allowing the TV to decode the video file itself while the computer merely acts as a server.
This feature is built into the Windows operating system by default. You don't need to install any third-party software; just set up sharing correctly. Open the movie folder, right-click, and select "Cast to device." The system will search for available receivers on the network.
For more advanced movie library management, it's best to use specialized software. A popular solution is VLC Media Player or KodiThey allow you to create playlists, manage subtitles, and select audio tracks directly from your TV remote.
Setting up a DLNA server in Windows is done through the standard interface. Go to "Streaming Media Settings" in the Control Panel. Here you'll see a list of devices on your network.
The status next to your TV's name should say "Allowed." If it says "Prohibited," click the corresponding link and change the settings. After that, the files will be visible on your TV in the "Media" or "Sources" section.
☑️ DLNA setup
Screen mirroring via Miracast and WiDi
If DLNA is for files, then the technology Miracast And WiDi (Wireless Display) are designed to broadcast the entire image. This is ideal for showing presentations, photos from a browser, or running an app that doesn't support DLNA on your TV.
In Windows 10 and 11, the functionality is deeply embedded into the system. A keyboard shortcut is used to launch projection. Win + KThe system will automatically begin searching for available wireless displays within WiFi range.
You also need to activate the corresponding function on your TV. Depending on the brand, it may have different names: "Screen Mirroring," "Casting," "Wireless Monitor," or "Smart View." Without this mode enabled on your TV, your computer won't be able to detect it.
| Characteristic | DLNA | Miracast / WiDi |
|---|---|---|
| Transmission type | Streaming video (file) | Screen mirroring |
| PC CPU load | Low | High (encodes the image) |
| Work in the background | Possible | Impossible (everything is visible) |
| Latency | Minimum | Noticeable (not for gaming) |
It's important to note that when using Miracast, the image is compressed on the fly, which can lead to compression artifacts on rapidly changing images. Furthermore, this method puts a significant strain on the laptop's battery and WiFi module.
Broadcasting for Apple owners: AirPlay and macOS
Ecosystem users Apple have a significant advantage due to native protocol support AirPlayIf you have a Mac and a TV that supports AirPlay 2 (many modern models do) Samsung, LG, Sony), the setting occurs automatically.
To mirror the screen on macOS, simply click the "Control Center" icon in the menu bar and select "Screen Mirroring." Available devices will appear in the list. When connecting for the first time, the TV may ask for confirmation or enter a code displayed on the screen.
Windows owners can also take advantage of AirPlay by installing third-party receiver apps such as AirServer or LonelyScreenHowever, the performance of such emulators is often inferior to the native implementation, and latency can be higher.
⚠️ Note: The AirPlay protocol is very sensitive to firewall settings. If your Mac can't see your TV, check whether your antivirus or built-in firewall is blocking incoming connections to the discovery service.
It's important to note that AirPlay not only allows you to mirror your screen, but also display video from the Safari browser or QuickTime player in a separate window, without interfering with other programs on your computer. This is achieved via the "AirPlay" button in the video player interface.
Why does AirPlay sometimes stutter?
The AirPlay protocol uses real-time video compression technology. If your router is overloaded with other devices or is located far away, the channel bandwidth may not be sufficient to transmit a full HD stream without buffering.
Third-party applications and browser extensions
When built-in tools are unstable or don't support the required file format, specialized applications come to the rescue. One of the most popular solutions is a bundle Plex or JellyfinThese programs transform your computer into a fully-fledged media server with a beautiful interface, posters, and descriptions.
Another powerful tool is the browser Google ChromeIt has a built-in casting function that works even on non-Smart TVs, as long as they have a Chromecast connected or the Cast protocol built in. To do this, click the three dots in the browser menu and select "Cast."
In the window that opens, you can choose what to stream: a browser tab, the entire desktop, or a specific media file. This is a universal method that works on Windows, macOS, and Linux.
For Android TVs and set-top boxes, an excellent solution is the app BubbleUPnP Or use the built-in "Stream" feature in the gallery. Your computer and TV must be on the same network, after which the file simply opens on your PC and selects the playback device.
Troubleshooting and quality optimization
Even with proper settings, problems can still occur: video stutters, audio lags behind the image, or the device can't be found at all. Most often, this is due to a congested WiFi channel. Try switching your router to a less congested frequency or channel.
If the image is choppy, try lowering the output resolution. For example, select Full HD instead of 4K. Also, make sure heavy background tasks, such as downloading torrents or system updates, are closed on your computer.
In some cases, resetting network settings can help. On Windows, this can be done via the command prompt with administrator rights, running the TCP/IP stack reset commands.
netsh winsock resetnetsh int ip reset
ipconfig /flushdns
After running the commands, you must restart your computer. This will clear the DNS cache and resolve any network protocol errors that may be interfering with device discovery.
⚠️ Please note: TV interfaces and operating system versions are constantly being updated. Menu locations and function names may differ from those described. Always consult the official documentation for your specific TV model.
Frequently Asked Questions (FAQ)
Is it possible to stream a movie if there is no router at hand?
Yes, some modern laptops and TVs support Wi-Fi Direct technology. This allows devices to connect directly, without a router. However, the transfer speed in this mode may be lower, and setup is more complicated.
Why can the TV see the computer but not open files?
Most likely, the folder's access rights aren't configured on your computer. Make sure that access is allowed for the "Everyone" group or the specific user under which the media server is running in the folder's properties on the "Sharing" tab.
Does streaming video over WiFi affect internet speed?
Local data transfer (DLNA, Miracast) occurs within your home network and doesn't use your ISP's bandwidth. Internet speeds may slow down only if your router is very weak and can't handle both external and local traffic simultaneously.
What video format is best for wireless transmission?
The most universal and easy to decode is the container MP4 with codec H.264Formats like MKV with codec HEVC (H.265) may require more powerful hardware or may not be supported by older TV models without transcoding.