MediaElement.js VS jQuery UI video widget

MediaElement.js provides HTML5 audio and video players in pure HTML and CSS.

HTML5 Video player built with jQuery UI.

Cross-browser compatibility
MediaElement.js is designed to work across all major web browsers, providing a consistent media experience regardless of the user's browser.
HTML5 and Flash support
It supports both HTML5 and Flash, ensuring media plays even on older browsers that do not support HTML5.
Customizable
It offers various options for customization, allowing developers to tailor the media player to fit the design and functionality needs of their website.
Accessibility
The player is designed with accessibility in mind, featuring support for screen readers and keyboard navigation.
Extensible
It supports plugins, making it easier for developers to extend functionality as needed.
Playlist support
It has built-in support for playlists, making it easier to manage and play a sequence of media files.
Consistent API
Provides a consistent API for media playback, which simplifies the process of media integration for developers.

Dependency on Flash
While it provides fallback to Flash, this can be seen as a downside since Flash is becoming obsolete and presents security vulnerabilities.
Performance
Depending on the complexity and number of media elements, performance can be an issue, especially on resource-constrained devices.
Size
The library can be relatively large compared to other media players, which can affect load times and overall performance of web applications.
Complexity
Though customizable, the process can be complex for developers who are not familiar with JavaScript and the library's configuration options.
Limited advanced features
While it covers basic needs well, it may not have advanced features out-of-the-box that other specialized media players provide.