Hello, For a number of years already, PulseAudio has supported a concept of sink inputs with multiple formats. That is meant to support S/PDIF output in addition to PCM. One thing I´m wondering... what is the expected behaviour for an application to negotiate non-PCM format for a stream? Specifically, if the application supports IEC 61937, should it always offer the relevant format (in addition to PCM fallback) when creating the stream? Or should it do so only if the user has somehow enabled that feature? In other words, is PulseAudio supposed to know if IEC 61937 will actually work, or is it merely naively listing the formats that the sound card allows, without regards to adequate speaker presence? Br, -- Rémi Denis-Courmont http://www.remlab.net/