There are 2 file types use the .MPL file extension:
1. AVCHD Playlist File
An MPL file contains a playlist created by Sony AVCHD digital camcorders. It stores an ordered list of names of individual video clips and references to recorded .MTS video files. MPL files do not store actual video data.
You will most likely only encounter an MPL file if you own a Sony AVCHD digital camcorder and transferred the MPL file to your computer. The files are referenced by the camcorder that created them for the purpose of video file navigation and playback. However, MPL files may be opened by various multimedia programs, such as Roxio Creator, Roxio Toast, and Cyberlink PowerDVD.
MPL files are saved in the AVCHD\BDMV\PLAYLIST directory of the recording media.
Updated: September 1, 2019
2. MPL2 Subtitles File
Video subtitles file created in the MPL2 format; uses a simple text format for specifying subtitles and supports a timing precisions of tenths of a second; supported by some video playback software, which displays the subtitles as the video is played.
MPL subtitles can be converted to the popular SubRip (.SRT) format using To SRT Converter.
Updated: May 28, 2016