alsa-project/alsa-lib issue #8 was opened from crocket: According to https://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html period_size in dmix is bytes per period. According to aplay --dump-hw-params period_size is frames per period. Which one is right? Issue URL : https://github.com/alsa-project/alsa-lib/issues/8 Repository URL: https://github.com/alsa-project/alsa-lib