In my testing, Open-Unmix separated audio at about 35% of the speed of Spleeter, didn’t support MP3 files, and generated noticeably worse results. Compare the output from Open-Unmix below for Lizzo’s isolated vocals, with drums clearly audible once they kick in at the 0:18 mark. The quality issues can likely be attributed to the model released with Open-Unmix, which was trained on a relatively small set of 150 songs available in the MUSDB18 dataset. The team behind Open Unmix is also working on “ UMX PRO,” a more extensive model trained on a larger dataset, but it’s not publicly available for testing. Years ago, I made a goofy experiment called Waxymash, taking four random isolated music tracks off YouTube, and colliding them into the world’s worst mashup. But I was mostly limited to a small number of well-known songs that had their stems leak online, or the few that could be separated cleanly with channel manipulation.
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