Modern smartphones have become powerful multimedia centers capable of storing gigabytes of footage in high resolution. However, viewing this content on a small screen is not always convenient, especially if you want to show the family album to guests or enjoy the details of 4K video. In such situations, the function of broadcasting images to a large display comes to the rescue. Android TV. This solution turns an ordinary TV into a full-fledged home theater with access to personal media files.
There are many ways to implement this task, ranging from simple wireless protocols to a physical cable connection. The specific method you choose depends on your device model, operating system version, and availability of additional hardware. In this article, we will analyze in detail the technical nuances of each option so that you can choose the most stable and high-quality method of data transmission for your situation.
Wireless broadcasting through the built-in functions of the system
The simplest and most accessible method is to use the built-in capabilities of the operating system Android and platform Google TV. The technology, known as Cast or Broadcast, allows you to mirror the screen of a smartphone or transmit a specific video stream directly to a TV without the need for unnecessary wires. For this method to work, it is critical that both devices are on the same local network.
The process of starting a broadcast is usually intuitive and takes a matter of seconds. You need to open the quick settings panel on your phone by swiping down from the top and find the “Broadcast”, “Smart View” or “Projection” icon. After clicking, the system will begin searching for available devices on the network. When your Android TVappears in the list, simply select it to connect.
It is worth considering that the quality of the picture and the stability of the connection directly depend on the power of your Wi-Fi router. When transmitting video at high bitrates, delays or compression artifacts may occur if the communication channel is congested. In this case, it is recommended to switch to the 5 GHz band, which provides higher throughput compared to the standard 2.4 GHz.
For perfect synchronization of sound and video during wireless broadcasting, try to place the router at the same distance from the phone and the TV, avoiding thick concrete walls between them.
Some smartphone manufacturers, such as Samsung or Xiaomi, may use their own implementations of this protocol with advanced functionality. For example, you can stream video in the background while continuing to use other applications on your phone, or change the aspect ratio of the image directly from your mobile device.
Using the DLNA protocol and media servers
If your goal is to play video files stored in the phone's memory, and not duplicate the entire screen, then the protocol DLNA will be optimal choice. This technology allows the TV to see the smartphone as network storage and play content directly without loading the mobile device processor with video stream processing. To organize such a connection, you will need a special server application.
The most popular solutions in the ecosystem Android are applications VLC for Android, BubbleUPnP or built-in galleries with a rendering function. After installing the app, you only need to specify the video folder and select the target device from the list of available renderers. The TV will automatically pick up the stream and start playing in its native player.
- 📁 The advantage of the method is that the phone can be locked or used for other tasks while watching.
- 🎬 Subtitle transmission and selection of audio tracks directly through the TV interface are supported.
- ⚡ The power consumption of the smartphone is reduced, since video decoding is carried out by the TV processor.
It is important to note that not all video file formats can be played correctly by the TV’s built-in player. If you encounter the "Unsupported format" error, try using a third-party player on your TV, for example VLC for Android TV, which has a wider range of built-in codecs.
⚠️ Attention: The DLNA protocol is not intended for transmitting protected content with DRM protection (for example, movies from paid online cinemas). When you try to broadcast such a video, you will see a black screen with working sound or an HDCP error message.
Connecting via an HDMI cable and adapters
For users who require maximum picture quality without any delays or compression, the only correct solution is a wired connection. Using an adapter USB-C to HDMI allows you to transmit an undistorted digital signal directly to the TV input. This method is ideal for watching video in 4K HDR resolution with a high bitrate.
Before purchasing an adapter, you need to make sure that the port USB-C on your smartphone supports video output via standard DisplayPort Alt Mode. Unfortunately, many budget phone models have ports that only support data transfer and charging, which makes the use of video adapters impossible. You can check this characteristic in the device specifications on the manufacturer's official website.
The connection process is as simple as possible: insert the adapter into the phone connector, connect the HDMI cable to the adapter and the TV, then switch the signal source on the TV to the appropriate mode HDMI 1 or HDMI 2. The image will appear automatically, often with the correct orientation and resolution.
☑️ Check before purchasing an adapter
It is worth considering that active video signal transmission significantly consumes battery power. Most high-quality adapters are equipped with an additional port USB-C for connecting a charger, which allows you to simultaneously watch videos and power your smartphone.
Broadcast through YouTube applications and streaming services
The broadcast function inside specific applications, such as YouTube, Netflix or IVI. This is not screen mirroring in the full sense of the word, but is a command for the phone to send a link to the video stream directly to the TV. As a result, the video is downloaded and played by the Android TV, using its Internet channel.
To use this function, open the video in the application on your smartphone and click on the broadcast icon (rectangle with waves), which is usually located in the upper corner of the player. Select your TV from the list. The client application will launch on the TV screen, and playback will begin regardless of the actions on the phone.
The main advantage of this approach is saving mobile data traffic and phone battery, since the main data flow goes through the Wi-Fi network directly to the TV. In addition, the quality of streaming is often higher than with regular screen mirroring, since the native TV application is used.
| Option | Screen mirroring (Cast) | Cast from application (YouTube) | HDMI cable |
|---|---|---|---|
| Phone load | High | Minimum | Average |
| Picture quality | Depends on Wi-Fi | Maximum (4K/8K) | Ideal (no compression) |
| Ability to minimize applications | No (usually) | Yes | No (screen busy) |
| Latency | Yes (0.5-2 sec) | Absent | Absent |
Why sometimes the YouTube broadcast button does not work?
The button may be missing if the applications on the phone and TV are logged in under different Google accounts or are located in different Wi-Fi subnets (for example, one on the guest network, the other on the main one).
Solving problems with delays and desynchronization
When wirelessly transmitting video, users often encounter the problem of sound and image desynchronization. The sound may lead or lag behind the picture by several seconds, making viewing unbearable. Most often, the reason lies in an unstable Wi-Fi signal or insufficient decoder performance on one of the devices.
To eliminate delays, try rebooting the router and both devices - the phone and the TV. This will clear the network settings cache and free up communication channels. Also make sure there are no heavy processes running in the background, such as downloading updates or cloud backups, which could clog the channel.
If the problem persists, it makes sense to reduce the broadcast quality in the settings of the player application. Switching from 4K to 1080p often solves the problem of lag on weak networks. In some advanced players, such as MX Player, manual adjustment of the playback buffer is available, increasing which can smooth out jerks.
⚠️ Attention: Settings interfaces and names of menu items may differ depending on the version of the manufacturer's shell (MIUI, One UI, ColorOS). If you do not find the described functions, check the “Connected devices” section or use the search in settings.
Frequently asked questions (FAQ)
Why does the phone not see the TV in the list of available devices?
The most common reason is - devices are connected to different Wi-Fi networks. Check that both the phone and Android TV are connected to the same router (same SSID network name). Also make sure that the “Broadcast Reception” function is turned on on the TV or the application is installed Google Home.
Is it possible to transmit video if there is no access to Wi-Fi?
Yes, this is possible via a direct Wi-Fi connection (Wi-Fi Direct), which many modern TVs support, or via an HDMI cable. In Wi-Fi Direct mode, the phone creates its own network to which the TV connects, bypassing the router.
Is sound transmitted when mirroring the screen?
In most cases, sound is transmitted along with the image. However, if you are using older protocols or specific adapters, audio may remain on the phone. Check the sound settings in the quick broadcast menu.
Does broadcast affect Internet speed?
When using the “Broadcast from an application” (YouTube) method, traffic goes directly to the TV without loading the phone. When mirroring the screen, the phone acts as an intermediary, which may slightly affect the overall load on the network, but is not critical for the Internet speed of other devices.
How to stop video broadcasting?
Click on the broadcast icon in the application on your phone and select “Disable” or “Stop.” You can also simply lock the phone screen or exit the application if you are using DLNA mode, but to completely terminate the Cast connection it is better to use the software disconnect button.