If you have trouble in playing back the H.264 files on your existing media player, there is a great and free H.264 player that you can try out. That's the VLC player. It works across platforms such as on Mac, Windows, Linux and etc. However, If you're used to your original media player and don't want to download another player on your computer, that's understandable. You can probably try to convert the H.264 files to other formats that's compatible with your own player. By the way, converting the H.264 files enables you to get the most out of it - recognized for playbacks in any application or device, supports further editing in any other software (i.e. iMovie or Final Cut) and so on.
What is H.264?
264 Video File Player
H.264 is an implementation of MPEG-4 Part 10, a standard for video compression. Compared to other video, it produces very high quality at a lower bitrate, which makes it more suitable to compress full high-definition video content into a smaller file size. However, it also consumes more resources than other popular video formats when it provides higher quality video. Actually, it's a video codec, which must be stored in other multimedia containers like the MP4, MOV, AVI, MKV and etc.
Graphics Hardware Requirements
Play H.264 Files by Video Conversion
Considering various video formats that your H.264 files are probably saved in, you'd better convert the H.264 files for smoother playbacks on a variety of applications and devices or etc. To convert to or from H.264 files, you'll need some help from the Video Converter (Video Converter for Mac).