Reliable playback of video media depends on the video codec’s that you have installed on your player PC. Many codec packs found on the web are not ideal as they often install cracked versions of commercial codec’s as well as malware and other malicious software.
There are free and trusted codec packs on the web like ffdshow Tryouts, which is a certified product, published under the GNU license and is maintained by the open-source community.
For more important information on Codec’s, click here.