A black screen instead of video or an endless loading indicator in Viber on Android often signal a conflict between the accumulated messenger cache and the device’s system libraries, even with a stable Internet connection.
The root of the problem may lie in something as trivial lack of RAM, as well as deep system failures of access rights to the storage. Modern versions of the operating system Android strictly control how applications interact with the file system, which sometimes results in media streaming being blocked. In this article, we will analyze in detail diagnostic algorithms and step-by-step methods for restoring the functionality of the video player.
Before taking radical measures such as reinstallation, it is necessary to eliminate software conflicts at the cache level. Statistics show that more than 60% of cases of video not working are solved by simply clearing temporary application files without losing chat history. However, if the problem is systemic in nature, deeper intervention in the device settings will be required.
Checking the Internet connection and network stability
First of all, you should make sure that the problem is not related to the quality of data transfer. Video files require significantly more bandwidth than text messages or voice notes. If the connection is unstable, data packages may be lost, resulting in the inability to decode the stream.
Try switching between mobile data and Wi-Fi network. Often, providers limit the speed or block certain ports used by instant messengers to transmit heavy content. It is also worth checking whether the data saving mode is activated in the settings of the application itself, which may prevent automatic downloading of media.
⚠️ Attention: If you use public Wi-Fi networks in cafes or airports, make sure that the authorization portal has been completed completely. Often the device shows the presence of a network, but actual access to the Internet is blocked until the login is entered.
To accurately diagnose the speed, you can use built-in tools or third-party utilities. Low downstream speed (Download) is the main cause of buffering.
- 📶 Check the signal icon: if it blinks or shows a letter
E/Ginstead of4G/5G, the connection is too slow. - 🔄 Restart your router: sometimes network equipment freezes and requires a restart to reset sessions.
- ✈️ Make sure Airplane mode is completely disabled and not running in the background.
Clearing the cache and data of the Viber application
The accumulation of junk files is the most a common technical cause of failures. The cache is designed to speed up work, but if its structure is damaged, it begins to work against the system. Clearing the cache will not delete your contacts or messages, it will only erase temporary thumbnails and video fragments.
To perform this procedure, you need to go to the system settings of your smartphone. Find the section Applications or Application Manager, then find it in the list Viber. Inside the application menu, select Storage. Here you will see two buttons: "Clear cache" and "Clear data". Start with the first one.
If clearing the cache did not help, you can try resetting the application data. Important: before doing this, make sure that your account is linked to a phone number and you remember login code, since this action will return the messenger to the initial installation state. The correspondence history can be deleted if a backup copy has not been made.
☑️ Cache clearing algorithm
After cleaning, force close the application through the task manager and open it again. The system will create new, correct temporary files, which often solves the problem with video decoding.
Setting access rights and permissions
Starting with version Android 10 and higher, the security policy has become stricter. The application may simply not have the right to read the file from internal memory or write to the playback buffer. Without the appropriate permissions, the video player inside the messenger will not be able to initialize the stream.
Go to the access rights settings for Viber. Make sure that permissions to access Photo and video, Music and audioand Files and media content are enabled. In some shells (for example, MIUI or OneUI), these settings may be hidden in the additional "Permission Manager" menu.
⚠️ Attention: If you recently updated your operating system, your privacy settings may have been reset. Check if there is a ban on displaying on top of other windows; this sometimes affects the operation of the built-in player.
The lack of permission to access the storage is often manifested by the fact that photos are opened, but videos are not, since the video requires buffering in a temporary folder, access to which is blocked.
Disabling battery optimization for the messenger
The energy saving systems of modern smartphones aggressively “kill” background processes. If Viber is on the list of optimized applications, the system may be restricting its access to the network or processor when you try to open a video. This leads to the download being interrupted in the middle.
You need to add the messenger to the exceptions. In the battery settings, find the item Battery optimization or App energy consumption. Find Viber in the list and select mode Do not optimize or No restrictions. This will allow the application to work at full capacity even when the screen is off.
The path may differ on devices from different manufacturers. For example, on Xiaomi you need to go to Applications -> Battery -> Energy Saving and select "No restrictions". On Samsung this is done through Settings -> Device care -> Battery -> Exceptions.
| Manufacturer | Path to settings | Required action |
|---|---|---|
| Samsung | Device care -> Battery | Add to "Sleeping applications" |
| Xiaomi / Redmi | Applications -> Battery | Select "No" restrictions" |
| Huawei / Honor | Battery -> Launching applications | Disable auto control for Viber |
| Google Pixel | Battery -> Adaptive mode | Disable for messenger |
Why does optimization interfere with video?
The system believes that if the screen is turned off or the application collapsed, the user does not need it. When you try to open a video, the application should “wake up”, but the system blocks this request to save battery, breaking the connection with the download server.
Updating system components and codecs
Video playback depends not only on the application itself, but also on system libraries Android System WebView and components Google Play Services. If these components are outdated or do not work correctly, the built-in player will not be able to decode modern compression formats, such as H.265 or VP9.
Go to the store Google Play Market, find the application Android System WebView and click "Update". If there is no update button, try clicking "Uninstall updates" and then update the component again. This action will overwrite the system rendering libraries.
It is also worth checking for updates for Viber. Developers regularly release patches that improve compatibility with new versions of Android. An outdated version of the client may simply not understand the data transfer protocols of the new server.
If updating through the Play Market is not available or gives an error, try clearing the cache of the Google Play store itself: Settings -> Applications -> Google Play Market -> Storage -> Clear cache.
Using third-party video players
The built-in messenger player may be limited in functionality or have bugs in a specific version. If the standard viewing method does not work, you can configure the video to open through an external player. This often bypasses internal decoding errors. Viber.
Install a reliable player, for example VLC for Android or MX Player. Then in the settings of Viber itself (section Media) find the option to open files. If there is no such option, just click on the downloaded video in the chat, hold your finger and select “Open with...”, indicating the installed player.
Third-party players have their own sets of codecs and often cope with damaged or non-standard streams better than the standard system tools. This is a temporary but effective solution to the problem.
⚠️ Attention: The settings interface may change with the release of new versions of the application. If you don't find the "Multimedia" item, look for it in the "Calls and messages" section or use the search in the settings inside the application.
Changing the player to a third-party one (VLC/MX Player) is the fastest way to bypass the bug of the built-in decoder without affecting the phone's system settings.
Frequently asked questions (FAQ)
Why does the video open for the other person, but not for me?
This indicates a local problem with your device. Most likely, the file was corrupted while downloading to your phone due to a network failure, or your cache is full. Try deleting the message and asking to resend it, after clearing the application cache.
Can an antivirus block video in Viber?
Yes, some aggressive antiviruses can scan the incoming video stream in real time and block it if they consider the encoding suspicious. Try temporarily disabling your antivirus or adding Viber to the exception list.
What to do if the video stops working after updating Android?
After major OS updates, access rights are often lost. Go to the application settings, find Viber and manually double-check all permissions, especially access to memory and microphone. Also update Android System WebView.
Does saving traffic affect video quality?
Yes, if traffic saving is enabled in Viber settings, the application will try to load videos in low resolution or block autoplay. Disable this function in the section Data and multimedia.
Will a full phone reset (Factory Reset) help?
This is an extreme measure. If neither clearing the cache, nor reinstalling the application, nor checking access rights helps, a reset can resolve a deep system conflict. However, before doing this, be sure to back up all important data.