How to remove the sound delay in Bluetooth headphones on Android Xiaomi

The problem of audio and video desynchronization when using wireless headsets is a classic pain of owners of Xiaomi, Redmi and POCO smartphones. You watch a movie, and the actors' lips move before the phrase is pronounced, or in games the shot sounds after the enemy has fallen. This phenomenon, known as Bluetooth Latency, is caused by the peculiarities of digital data transmission and signal encryption.

However, on Xiaomi devices, the situation is often exacerbated by aggressive optimization of the MIUI shell or HyperOS, which can incorrectly prioritize background audio transmission processes. Fortunately, in most cases, latency can be minimized or completely eliminated if you properly configure the system parameters and select the appropriate codec.

In this article, we will not only break down standard methods, but also the hidden engineering settings available through the developer menu. Xiaomi provides users with a wide range of tools to fine-tune wireless interfaces that you just need to learn how to use.

Causes of Lags in Wireless Sound

To effectively combat the problem, you need to understand the nature of the problem. The delay is because it takes time for a smartphone to encode the audio stream, transmit it over the radio channel and then decode it in headphones. The standard SBC protocol, which supports absolutely all devices, has the greatest latency, often reaching 200 ms or more.

Xiaomi owners often face a situation where, after updating the firmware, the system resets the codec settings to a more compatible but slow option, and background apps that consume traffic, or physical obstacles between the phone and the headset, also influence the impact.

⚠️ Attention: Using third-party apps to “boost” the Bluetooth signal often leads to the opposite effect – an increase in the load on the processor and an increase in delays.

The key is that your device and headphones support advanced codecs like aptX Low Latency or aptX Adaptive. If at least one of the devices doesn’t support these technologies, the phone will automatically switch to the base mode with high latency.

Checking codec support and choosing a headset

The first step is to find out the technical capabilities of your bundle of smartphone headphones. Not all Redmi Buds or Mi True Wireless models support fast data transfer. Basic models are often limited to the AAC or SBC codec, which physically does not allow for minimal latency.

You can check the current active codec through an engineering menu or special applications like Bluetooth Codec Changer, although newer versions of Android may have limited access to them. Ideally, for games and videos, you need headphones that support aptX LL (Low Latency) or proprietary game modes from Xiaomi.

• 🎧 aptX Adaptive: Dynamically changes bitrate and latency depending on conditions, perfect for Xiaomi flagships.
• 🎮 Game Mode: Many Xiaomi headphones have a special mode in the Mi Earbuds app, which forcibly reduces buffering.
• 📉 SBC / AAC: standard codecs with a delay 150-300 MS, suitable only for music, not for video.

If your headphones support gaming, be sure to activate it. This is usually done by triple touching the touch zone or through a companion app, which shifts the priority of data rate over sound quality, which is critical for synchronization.

💡

To view supported codecs in the hidden menu Android dial in the application "Phone" code ##7777## (It does not work on all models, or ADB Team: Adb shell dumpsys bluetooth_manager.

Set up hidden developer parameters on Xiaomi

The most effective way to influence Bluetooth is through the developer menu, which is hidden by default in the MIUI and HyperOS shell. To activate, go to Settings → About Phone and quickly click 7 times on the MIUI version.

Once you have become a developer, go to Settings → Advanced Settings → Developer. Here we are interested in the Network or Bluetooth block. Find the Bluetooth Audio Codec and try to change it.

Also worth paying attention to is the Bluetooth Audio Sample Rate parameter: Increasing sampling frequency can improve quality, but in rare cases, on weak processors, cause micro-lags. Experimentally select a value of 44.1 kHz or 48 kHz.

Remember, once you change these settings, you need to reconnect your headphones completely, remove the device from the pair list and re-create the pair, and only then the new codec will take effect.

Use of Engineering Menu and ADB Teams

For advanced users who don’t have enough standard settings, there is the option of intervening via USB debugging, a method that allows you to change the Bluetooth configuration system files that are responsible for buffering.

You will need a computer, a cable. USB and established ADB (Android Debug Bridge should be on the phone to "Debug by" USB" Connect your smartphone to your PC and type a command to check the connection:

adb devices

To force a change in Bluetooth profile, you can use commands that turn off absolute volume or change stream priorities. However, the most effective method on Xiaomi is to reset the Bluetooth stack settings via ADB:

adb shell pm clear com.android.bluetooth

⚠️ Note: The pm clear command completely clears Bluetooth data, including all stored pairs.

There is also a method of changing the value ro.bluetooth.a2dp_offload.supported In system files, but this requires superuser rights (Root) and can lead to unstable system operation during updates.

MIUI and HyperOS: Memory Optimization

Xiaomi’s shells are known for their aggressive work with RAM, which can “kill” processes that are responsible for the stability of Bluetooth connections to save battery power or free up resources for games.

Go to the battery settings and find the app you're watching the video through (like YouTube, VLC or Netflix) and set the power saving mode to "No Limits" and prevent the system from interrupting the background activity of the player.

Also on the Advanced Settings menu → Special Options, check if any Xiaomi audio enhancers are enabled that may conflict with headphone drivers. Sometimes disabling Dolby Atmos or Dirac paradoxically reduces latency.

• 🔋 Performance mode: Turn on Balance or Performance in the battery settings, abandoning the power saving mode.
• 📡 Wi-Fi interference: Bluetooth and Wi-Fi operate in the 2.4GHz band. If possible, switch your router to 5GHz or turn off Wi-Fi when watching heavy video.
• 📱 Background Processes: Close all unnecessary apps before launching a video or game.

Owners of older Xiaomi models should consider that the hardware limitations of the processor may not allow you to process high-resolution video and sound simultaneously without delay, in which case, reducing the quality of video in the player can help.

Third-party applications and video codecs

If the system settings didn't work, the problem could be in the player itself. Standard galleries and video players often have their own play buffers. Try installing VLC for Android or MX Player.

In the settings of these players, there's often an option called "Audio output" or "Sync." In a VLC, for example, you can manually move the audio track a few milliseconds forward or backward to compensate for the delay. It's a crutch, but it works.

For streaming services like Netflix or YouTube, latency often depends on the Internet connection. Make sure you have hardware decoding enabled in your app settings. Xiaomi has problems with this, and switching to software decoding sometimes solves the problem.

💡

Integrated approach: the combination of the headphone game mode, the aptX codec in the developer menu and the power saving switch for the player gives a 95% guarantee of eliminating lags.

FAQ: Frequently Asked Questions