as I mentioned before, the mixer mix 6 stream max, background(raw image or MPEG 2/4 I frame), main video, main subtitle, pip video, pip subtitle, interactive overlay(HDMV IG or BDJ), now in dslibbluray just implement main video, main subtitle and interactive overlay. To mix them, three solution, 1. custom mixer, 2. intergrate all video decoder inside soure filter, 3.the decoder can decode all streams and mix it. Current using solution 1.
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