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Absolutly, I open the title and check the HD file and then un-check the core file. If I open the finished mkv file with tsmuxer it says the audio is HD, but my Oppo players ( I have both the BDP-93 and 105) only plays the DTS 5.1 version. I tried a 7.1 DTSHD-MA movie and it down grades to DTS 5.1. I...

When converting a BD disk I select the only the main movie and the HD audio file only, but when playing the file on an Oppo player the audio shows most times (95%) as DTS 5.1 (not DTS_MA 5.1). There have been some that convert correctly and some convert a True HD to an MLP, which I know is lossless....