How to best convert .mts1 videos to .mp3 audio format.
Converting MPEG-2 Transport Streams directly to MP3 Audio Files (.mts1 to .mp3 conversion) is certainly possible and should be quite straightforward. It relates to users attempting to extract the audio track (MP3) from an MTS1 video. It appears, however, that your options for a direct conversion are quite limited.
Try using Freemake Video Converter, which should allow users to import MTS1 videos and export their extracted audio track in MP3 format.
One of the most popular and successful free video conversion softwares