In this case there is no need for audio, the first PIP stream only features a video with static images and the audio is from the movie itself, not unique from that PIP stream. But I wonder if there was any audio if it could be extracted by TSMuxer.
I don't know about the remaining PIP streams but it's sad that we still have relevant contents from Blu-rays that can't be converted into MKV properly. I hope the developers can add that functionality one day (specially MakeMKV, that can't even extract the first PIP stream).
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