DVD-Audio changes for better behavior/ formatting changes
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before when there is no MKB file and you compile with libdvdcss, libdvdread returns an ERROR message when it shouldn't because it can't find the MKB file, though in this case it just means that the disc probably isn't encrypted. I added a check to make sure the files are there before trying to open them
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For dvd-audio there is only one MENU VOB , AUDIO_TS.VOB and the still images in AUDIO_SV.VOB, it makes no sense to replace this call with something like ATS_01_0.AOB since they don't exist, and even if they did AOB files are not menus. I think this call for DVD-Audio should either be restricted somehow, or replaces with behavior to get still images from AUDIO_SV.VOB. Though I think maybe this should be made a seperate call entirely because it is so different.