On Wed, May 27, 2015 at 09:44:08 +0000, Carl Eugen Hoyos wrote: > The reason is that AC-3 is only specified for up > to six channels. That would be E-AC3 = Dolby Digital Plus then instead? http://www.dolby.com/us/en/technologies/dolby-digital-plus.html Again, I don't _think_ ffmpeg supports 7.1 there. Moritz