I don't know if surround=stereo. I know that Lumia Camera have this option (Surround on/off). I know that lumia 930 have 4 mics and 5.1 audio channel. Is this compatible with Microsoft Camera from Windows 10?
I have the same question. I started using a Lumia 830, and it has Dolby 5.1 surround recording on the original Nokia/Lumia Camera app (8.1)
But after W10, Camera app only records mono audio. And Lumia Camera Beta app records in stereo. If you enable it, LCB can also record in 5.1 surround although, the video file outputs are a little weird. They come with additional .TNL files. The video file has 2 different audio tracks, 1 as a 2.1 stereo and 1 as a 2.0 stereo. You choose between them when playing on a PC (as if they were different language audio tracks). I didn't check this with the W8.1 videos but isn't it supposed to mix the 3 mics (for the L830) into a single 5.1 surround audio track?