Convert STR to MP3

Converting PlayStation Video Streams directly to MP3 Audio Files (.str to .mp3 conversion) might be doable using SUPER, a free all-purpose media, audio and video converter, which should let you extract the audio track (MP3) from a STR video.

Alternatively, you will first need to convert STR to AVI, which can be done using utilities, such as PSXVideo or STR Converter. Then you can easily convert AVI to MP3.