How does KMPlayer not open MP4 and FLV files?

The number of people using KMPlayer software to listen to audio or watch videos on a computer is quite a lot, due to its friendly interface that is easy to use and can read many popular file formats today.

However, in some cases the program cannot format MP4 or FLV files available in the computer. When you try other videos, it is still possible to watch normally. So let us try 2 ways that Network Administrator will guide below to fix the unreadable MP4 and FLV errors on KMPlayer.

1. Download KMPlayer for free
2. Download KMPlayer for Android
3. Download KMPlayer for iOS

Method 1: Add a video Codec

The program cannot read FLV or MP4 format because your computer lacks Video Codec to play these formats.

1. Search and download Codec for each video file at the following link.
2. Or install the Mega K-Lite Codec Pack Mega decoder to your computer.

Method 2: Set up in Internet Options

Step 1:

At the Windows search bar on your computer, type the keyword Internet Options .

Or on Internet Explorer, we click on Tools and also select Interet Options .

Step 2:

Appearing the Internet Options window, we select the Security tab. Then drag down and click the Custom level button .

Step 3:

The Security Settings window - Internet Zone appears. Here, you'll scroll down to find ActiveX controls and plug-ins . Check the Enable box for the following items:

1. Cho phép trước không sử dụng ActiveX điều khiển cho chạy với lệnh chưa thực hiện
2. Allow Scriptlets.
3. Automatic prompting for ActiveX controls.

After ticking, click OK to save the new setting.

Above, we have helped you to fix the unreadable MP4 and FLV file formats in two ways. You can also use these ways when you cannot read the different formats. Hope you can run those 2 file formats when you overcome them by the above methods.

Refer to the following articles:

1. Common shortcuts for KMPlayer need to know

1. Adjust the speed of watching videos in KMPlayer

1. 2 simple ways to block ads in KMPlayer

I wish you all success!