You seem to be very confident with your statements. Unfortunately, I have to disagree.
Generally I transcode my BluRay rips as well, simply because the file size of uncompressed (or transcoded or whatever you want to call it) movies is just insane and doesn't provide considerably more quality than a compressed movie that is only half the size. Well at least I don't see any difference on my 55" screen, so I'm fine with compressing them.
Anyway, I got the Sherlock Holmes BluRay last week and wanted to see if you're right in saying that the 2009 Mini can't play uncompressed movies.
Well, I ripped the movie made an .mkv of it (with a file size of 23GB) and fired up Plex.
No problems whatsoever on my 2009 Mac Mini with 2.26GHz. Average CPU usage is 87% (out of 200).
But that's just my two cents...
HD audio will push your CPU usage over the top. Nigh-on guaranteed. I couldn't make
anything run properly with HD audio.
I might also add, just because one Blu-ray rip runs fine doesn't mean that they all will. I don't have that disc (although I intend to buy it...), so I can't comment specifically on that video stream, but some Blu-ray streams have higher bitrates than others. For instance; in my testing, reducing The Hurt Locker to an .MKV made it work for me, but the same treatment for The Men Who Stare At Goats didn't fix it. It still stuttered occasionally.
EDIT: The debate that I had several months ago is being recounted out of context, here. I'll summarise it, if I may.
I was advised by a couple of members on this board that the 2009 Mini could run Blu-ray quality rips, and the Apple Store goon from whom I bought the machine gave a similar view. At the time that I received this advice (January 2010), hardware acceleration had not been implemented in Plex - and, let me tell you, at the time that I was given that advice it was outright lies.
I began to complain about this issue in May or so, and I was advised in the course of my complaints that hardware acceleration had since been implemented. I downloaded the new binaries, and the performance improved appreciably - but it was still flawed.
My 'crusade', in relation to this issue, was not against the 2009 Mini but against
the excessively partisan advice that had influenced me in my decision to buy one. The 2009 Mini is a very serviceable machine, and I have no personal problem with it. On the contrary, there was a lot about that little computer that I really liked.
If the Plex binaries have been further improved to circumvent this issue, I would be pleased to hear it. But, four months ago, without the merest shadow of any doubt, the 2009 Mini
could not, would not, and did not play unprocessed Blu-ray rips without stuttering. Honestly. If I were making it up, do you not think that I might've got bored by now...?