There are several alternatives to QuickTime Player that you can use. One of the most popular and widely recommended options is VLC Media Player. It is a free and open-source media player that supports a wide range of formats and codecs. I have personally used VLC for many years and I find it to be a reliable and versatile player.
Another great alternative is MPC-HC (Media Player Classic – Home Cinema). It is a lightweight player that offers a simple and clean interface. MPC-HC also supports a wide range of formats and has a variety of features such as customizable hotkeys, built-in codecs, and support for subtitles.
If you prefer a more minimalistic and lightweight player, you might want to consider MPV. It is a free and open-source media player that focuses on simplicity and performance. MPV has a command-line interface by default, but there are also several graphical front-ends available if you prefer a more traditional user interface.
PotPlayer is another popular alternative that offers a sleek and modern interface. It supports a wide range of formats and has advanced features such as 3D playback, screen capture, and video editing tools. PotPlayer also provides a lot of customization options, allowing you to personalize your playback experience.
SMPlayer is another good option that is known for its user-friendly interface and extensive customization options. It has a built-in codec finder that automatically downloads and installs the necessary codecs for playing different formats. SMPlayer also supports subtitles, has a variety of audio and video filters, and allows you to bookmark your favorite scenes.
These are just a few examples of the many alternatives to QuickTime Player available. It ultimately depends on your personal preferences and specific needs. I would recommend trying out a few different options to see which one works best for you.