How to convert .m2p videos to .mp3 audio format.
Converting MPEG-2 Program Stream Files directly to MP3 Audio Files (.m2p to .mp3 conversion) should be possible, even though your options are limited. It relates to users attempting to extract the audio track (MP3) from an M2P video.
Use a media editing software or (online) conversion tool, such as Nero Recode, which should allow users to import M2P videos and export their extracted audio tracks in MP3 format.