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FFmpeg (as well as Libav) have two layouts called "6.1": AV_CH_LAYOUT_6POINT1 and AV_CH_LAYOUT_6POINT1_BACK. We call them "6.1" and "6.1(back)". Change the default layout for 7 channels as well to return the same layout as av_get_default_channel_layout(). (Looks a bit questionable, but for now it's better to follow FFmpeg.)