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Which seems to suit your quest to determine whatever happened in there (JRiver). Example: for each item listed there's a plethora of sub functions like There's lots of tips and tricks and most of it is undocumented. OK, from there on let's see it as a challenge and maybe use this thread to work it out. Or save the result lists to continue with it later. You can apply selections of what to copy as well. After that the net result list of differences can automatically be copied (added) to the output folder. In my case 54K albums are in there, and the comparison will take maybe 5 minutes. In this case the 417 albums in G:\RS2\ will be compared against C:\Galleries, this latter being your net output folder.
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And remember, it works at the level of albums, which means that each album is contained in its own folder. But although you are allowed to check this out a little, it won't work anyway without a license because the demo version is limited to 100 albums of output for selections/lists. This functionality is named Compare Albums. A too wide bandwidth implies all is the same. The algorithms to do this are crazily complex and with a too small bandwidth all is different (it also depends on ripping and (e.g.) EAC CD Drive settings). N.b.: XXHighEnd contains formal functionality for the very same, but now within a bandwidth of albums being the same or different (like a remaster would be different from an original). You can copy to this same folder until you processed everything. Then indeed you could answer "skip" and "do this for all next 20000 etc. But let's say you don't even care about this much because it is just music files (is it ?). That is, when you copy one file it works like this. Such a message comes along with something like "the new one is larger" or "the new one is newer" or "both are equal". You must first test this a little to the merits of your own choice (you define the rules), but:
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I get a message saying "x" number of files with the same name existed. After about two hours of moving about 1.8TB files.
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