This is the most confusing part of the search string. Technically, a movie file is already "portable" because you can move an MP4 file between devices.
: In digital media, "portable" can refer to two things. First, it refers to video formats optimized for mobile devices (like smartphones and tablets) with smaller file sizes and compressed resolutions. Second, it can refer to portable media players (like VLC Portable) that run directly from a USB drive without installation. The Cultural Impact of Chup Chup Ke index of chup chup ke portable