The most requested feature for basic assets is here: MP4 support
Blog post from Mux
Mux has expanded the capabilities of its basic quality video assets by introducing MP4 support, allowing users to create video MP4s up to 1080p resolution or audio-only m4a files without an upfront cost, although a small monthly storage fee applies. This update addresses the demand for MP4s needed for various uses, such as offline playback and content analysis, and maintains the platform's Just-In-Time encoding feature. Users can enable MP4s on both new and existing basic quality assets by following instructions provided in the MP4 Support Guide. While the company has not yet launched 2K and 4K support for basic assets, it assures users that these features are forthcoming and encourages feedback on additional desired functionalities.