I'm using vlc to play a stream and got the same error when trying to play an mp3 file earlier. The stream and the file play eventually. I searched for this one using duckduckgo and got one result in german which I do not speak and certainly do not do technical german which is why I'm asking here. ALSA lib pcm_dmix.c:1052:(snd_pcm_dmix_open) unable to create IPC semaphore --