Cisdem Video Player is a media player with support for a huge number of video and audio formats. A list of supported formats can be obtained from the publisher's website. The player also supports subtitles and adds a conversion functionality.

Interface is similar to most media players. Controls are accessible from the bottom panel, where you can also find buttons for accessing subtitles, soundtracks, for taking a screenshot, and for media conversion. Note that in order to use conversion functionality, you will have to purchase a license.

The player supports playback of high quality video in 4K and even in 5K resolution. Although there is a conversion functionality added to the software as well, it won't be needed in most of the cases, as the player supports almost every format available, but can be used for conversion to a number of mobile formats.

There are predefined hotkeys for some of the most used actions, which can be changed at any time by accessing the Preference Setting window. Hotkeys include play/pause, stop, step forward and backward, and also hotkey for full screen and for taking a screenshot.

In conclusion, Cisdem Video Player is a video and audio player for Mac operating systems that can handle a large number of formats, and can playback also high resolution video content without lag or crashing. Besides that it includes a converter and enables setting hotkeys for some of the most used actions.