Modern media centers have turned into powerful entertainment hubs, but sometimes the built-in functions are not enough or the interface seems too complex. It is much easier to manage content from a regular smartphone, displaying the image on a large screen. The question how to broadcast video from a phone to an Android TV set-top boxbecomes especially relevant for those who want to watch movies, photos or play mobile games on a TV without unnecessary wires and complex settings.
There are several fundamentally different methods of signal transmission: wireless transmission through protocols Wi-Fi Direct i DLNA, as well as a wired connection via USB-C. Each method has its own advantages depending on the task: to watch movies in 4K it is better to use a local network, and to mirror the screen of games you will need technology with minimal latency. In this article, we will analyze in detail all the available options, from built-in system functions to third-party applications.
Preparing devices and checking compatibility
Before you start setting up, you need to make sure that both devices are on the same local network. This is a basic requirement for the operation of most wireless protocols, such as Chromecast and Miracast. Go to the router settings and check whether your smartphone and TV set-top box are connected to the same SSID, and it is advisable to use the 5 GHz band to ensure high channel throughput.
On the Android TV set-top box side, you often need to activate the receiver mode. In standard Google firmware, this feature may be hidden deep in the menu. You need to go to Settings → Device settings → Preferences → Broadcast and make sure that the switch is in the active state. If you are using a custom shell from the set-top box manufacturer, look for a section called Display or Connections.
⚠️ Attention: Some budget models of TV set-top boxes have weak Wi-Fi modules that do not support simultaneous operation in client and access point mode. If the broadcast is constantly interrupted, try disconnecting other devices from the network or rebooting the router.
It is also worth checking the version of the operating system. For stable operation of modern codecs, it is desirable to have Android 9.0 or higher on both devices. Outdated versions may not support new video stream encryption standards, which will lead to desynchronization of sound and image or a complete lack of signal.
Using the built-in Google Cast function (Chromecast)
The most reliable and high-quality way to transfer content is to use native technology Google Cast. It's built right into the core Android TV system and is supported by most popular apps like YouTube, Netflix and Google Photos. This method differs from simple screen mirroring in that the set-top box itself downloads the stream from the Internet, saving the battery power of your smartphone.
To start the broadcast, open a supported application on your phone and find the rectangle icon with waves in the corner. Clicking on this icon will bring up a list of available devices. Select your Android TV Box from the list. If the device is not displayed, make sure that applications have permission to access the local network in the privacy settings of the smartphone.
The advantage of this method is the ability to control playback from the phone without taking up the screen with the broadcast content. You can minimize an app, answer a call, or even lock your phone, and the video on your TV will continue. This is critical when watching long movies or TV series.
If the broadcast icon does not appear in the application, check whether the power saving mode is turned on on your phone, which often blocks background network activity.
Screen mirroring via Miracast and Wi-Fi Direct
Sometimes you need to show exactly what is happening on the phone display on the big screen, for example, a game that doesn't support Cast, or a presentation. For this, technology Miracastis used, which creates a direct connection between devices, bypassing the router. On TVs and set-top boxes, this function is often called “Wireless Display”, “Screen Mirroring” or “Broadcast”.
On an Android smartphone, the startup process usually looks like this: lower the notification shade and find the Broadcast, Smart View (for Samsung) or Projecttile. The system will begin searching for available receivers. At this time, the corresponding receiver application must be open on the set-top box, which is often called AirScreen or built-in mirroring tool.
It is worth noting that when using Miracast, the load falls on the phone's processor, since it encodes the video stream in real time. This may cause the device to heat up and consume more power. In addition, a slight input lag is possible, which makes this method less suitable for dynamic shooters, but quite sufficient for strategies or viewing photo albums.
| Parameter | Google Cast | Miracast | DLNA |
|---|---|---|---|
| Latency | Minimum | Average (0.5-2 sec) | Absent (file) |
| Battery consumption | Low | High | Average |
| Network dependence | Wi-Fi required | Direct connection | Wi-Fi required |
| Quality | Up to 4K HDR | Signal dependent | Original file |
☑️ Check before mirroring
Broadcasting local files via DLNA and third-party applications
If you have a collection of movies or photos on your phone that you want to watch on TV, but the Internet connection is unstable, the ideal solution would be the protocol DLNA. It allows you to transfer media files directly from your smartphone storage to the set-top box decoder. To implement this scenario, you will need special server applications, such as BubbleUPnP, AllConnect or built-in file managers with the DLNA function.
The setup process is as follows: install the server application on your phone and add folders with media files to the library. Then on the console, launch any player that supports DLNA (for example VLC for Android or built-in gallery). In the player menu, select the “Local Network” or “UPnP” section, where your smartphone will be displayed as the content source.
This method guarantees maximum image quality, since the file is not compressed during transmission, but is sent in the original bitrate. However, file navigation is done through the TV's interface, which can be less convenient than touchscreen controls. To solve this problem, many applications allow you to use your phone as a remote control.
⚠️ Attention: When transferring heavy files (4K remixes 50-80 GB in size) via Wi-Fi, there may be stuttering if the signal is unstable. In such cases, it is recommended to use a gigabit wired connection for the set-top box.
Why does video slow down with DLNA?
A common reason is codec incompatibility. The set-top box may not support the format of the container or audio track that is in the file on the phone. Try installing a third-party player on your TV, such as MX Player with its own codecs.
Wired connection via USB-C to HDMI
For those who strive for absolute stability and zero latency, there is a wired connection method. If your smartphone supports the standard DisplayPort Alt Mode or technology MHL, you can connect it to a TV set-top box (or directly to the TV, if the set-top box has a free HDMI port) using a special USB-C to HDMI adapter.
This method turns your phone into a full-fledged computer. The image is displayed in native resolution, the sound is transmitted over a digital channel without compression. This is the only option that allows you to play demanding mobile games on a large screen without wireless stream compression artifacts. However, it is worth remembering that not all mid-segment smartphones support video output via USB.
When using a cable, the phone's power may be consumed faster, so it is recommended to use an adapter with an additional charging port (PD Pass-through). This will allow you to simultaneously broadcast the image and replenish the battery charge, avoiding sudden shutdown of the device at an important moment.
A wired connection is the only way to guarantee the absence of delays when playing dynamic games and watching videos at the maximum bitrate without depending on the quality of Wi-Fi.
Solving problems with latency and image quality
Even with the correct settings, users may encounter artifacts: the picture is scattered into squares, sound desynchronization or periodic freezes. Most often, the reason lies in an overloaded Wi-Fi airwave. If you live in an apartment building, the channels may be clogged with signals from neighbors, which reduces the actual data transfer speed.
Try to manually change the Wi-Fi channel in the router settings to a less busy one (usually channels 1, 6 or 11 for the 2.4 GHz band, or any free ones for 5 GHz). It also makes sense to disable downloading torrents or updates on other devices on the network during the broadcast. To diagnose speed, you can use applications like Wi-Fi Analyzer.
Another common problem is resolution mismatch. If the phone tries to display a picture in 4K, but the set-top box or TV does not support this mode, the image may be missing. Go to your phone settings in the Screen → Resolution section and try to downgrade it to 1920×1080. This often solves the problem of compatibility with older TV models.
⚠️ Attention: Settings interfaces and menu item names may differ depending on the shell manufacturer (MIUI, OneUI, ColorOS). If you do not find the described items, use the search inside the phone settings menu using the keywords “Broadcast” or “Connection”.
Frequently asked questions (FAQ)
Why does the TV not see the phone when searching for devices?
Make sure that both devices are connected to the same Wi-Fi network. Check if your router has client isolation (AP Isolation), which prevents devices from seeing each other. Also try restarting both gadgets.
Is it possible to stream audio separately, without video?
Yes, many applications for DLNA and Cast allow you to transmit only an audio stream. This is convenient for listening to music or podcasts through a good TV speaker system while the screen is off.
Does broadcasting affect Internet speed?
When using Google Cast, traffic goes directly from the Internet to the set-top box without loading the phone. When using Miracast or DLNA from local files, the Internet channel is not used at all, the traffic goes inside the local network.
How to disable broadcasting?
On your phone, click on the broadcast icon in the application or in the notification shade and select “Disable” or “Stop”. On some set-top boxes, you can press the "Back" or "Home" button on the remote control to exit the reception mode.
Do all Android set-top boxes support AirPlay from the iPhone?
No, not all have native AirPlay support. To broadcast from iOS to Android TV, you will need to install third-party receiver applications, such as AirScreen or Receiver for AirPlay, which emulate the Apple protocol.