MPEG-4 (MP4) is a container video format that can store multimedia data, usually audio and video. 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. It is also a popular video format for streaming over the Internet, such as on YouTube. Many consider MP4 to be one of the best video formats available today.

If you can not play the MP4 video, it could be corrupted (i.e. missing file chunks) or DRM protected. While these two issues can not be recovered, FreeConvert.com can still help you play your MP4 files by making them compatible with old devices (Enable this option after selecting H.264 codec from the Advanced Options). On some devices, particularly mobile, opening this file type can be problematic. 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. To resolve this issue, try VLC media player.