If you have some video files which failed to play on your device, you may try some video converter software, here's a good one
How to convert videos to other format
The video converter software can convert videos between formats, including mp4, mov, asf, wmv, mkv, avi, mpeg, mpg, and other formats. You can use this video converter to convert videos to other format so that it can be added, play on your devices, like Windows computer, mobile phones, iPad, iPhone, iPod, Android phones like Samsung Galaxy, LG, Huawei, Oppo, Vivo, Sony Xperia, etc. You can convert and play videos in your media player and devices.
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