but I have the space to accommodate for that. I've been scouring for software that can convert 4K mkv to 4K mp4, I'm aware the file size could double, triple, etc. The videos played just fine but there was no audio (I got the 'audio data not supported' error) I think this because all the films I have are 7.1 sound, the 4K Planet Earth episodes I have are 5.1 and they play just fine through the TV. I decided to test out it's capabilities by trying some 4K films (all mkv format) I have on my external HDD USB.

To resolve this issue, try VLC media player.I recently purchased a Samsung UE49MU6400 UHD TV. MP4 is a container that contains various kinds of data, so when there is a problem opening the file, it usually means that data in the container (an audio or video codec) is not compatible with the device’s OS. On some devices, particularly mobile, opening this file type can be problematic. On Windows, it opens in Windows Media Player. There is no need for third-party software. Simply double-clicking the file opens it. MP4 files open in the operating system's default video player.

Many consider MP4 to be one of the best video formats available today. It is also a popular video format for streaming over the Internet, such as on YouTube.

It is compatible with a wide range of devices and operating systems, using a codec to compress file size, resulting in a file that is easy to manage and store.

MPEG-4 (MP4) is a container video format that can store multimedia data, usually audio and video.

Av to mp4 converter