Premiere Pro CC H.264 Blu-ray rendering problem

Question

Hi!
I have a problem when try to render AVCHD files (.m2ts) to H.264 Blu-ray. This is the issue that follows me from Premiere Pro CS6 and old machine. When I create a sequence from AVCHD (.m2ts) files and try to export it with H.264 Blu-ray settings (only two changes I made in default settings are multiplexing to TS and change audio to Dolby digital) i got few seconds shorter video file than the original timeline and automatically audio and video are out of sync. I notice that when I try to play rendered video with Windows media player (Media player classic and VLC player also play it the same way) after a while audio is starting to be out of sync. When I import rendered file again into Premiere Pro CC and put it in timeline I can see that my rendered video is shorter than original timeline (I have 4h 30min project and rendered video is 4sec shorter; everything is there but 4sec shorter - probably faster, it is hard to notice how faster because of long timeline, but obviously 4sec faster)
Also, when I take that same project to my friend and render it again everything is ok. He is running a little bit better machine but also he is running Premiere Pro CS6 and I'm running Premiere Pro CC. That was the issue also when he was running Premiere Pro CS 5.5 and run Premiere Pro CS6 a year ago. All settings stays the same when I render and when my friend render the same sequence. I have audio out of sync and he haven't
One more question: Premiere Pro and AME not using Mercury Payback Engine GPU Acceleration at all. In AME I chose renderer: Mercury Payback Engine GPU Acceleration but when I look at NVIDIA inspector I can see that GPU usage is 0% when rendering is in progress. Any idea?
THX!

Answer 1

Thank you Jim,
but I'm confused. Same project, absolutely same settings but with different hardware got different results?
About 2 years ago I had AMD Athlon 3200+, ATI Radeon X800XL, 8GB DDR2 RAM, Win 7, Premiere Pro CS6 (AVCHD input, rendering to .m2t, all settings to default, just multiplexing set to TS because I need audio and video multiplexed to be able to play directly from external HDD to LED TV via USB) - result: audio is out of sync.
My friend had Intel i7, nVidia GTX 550, 16GB DDR3 RAM, Win 7, Premiere Pro CS5.5 (same project, AVCHD input, rendering to .m2t, all settings to default, just multiplexing set to TS) - result: everything OK.
Few days ago same thing, but with new hardware - my hardware: Intel i5, nVidia GTX 760, 16GB DDR3 RAM, Win 8.1, Premiere Pro CC (AVCHD input, rendering to .m2t, all settings to default, just multiplexing set to TS) - result: audio out of sync (as a matter of fact video is shorter - I didn't realize that few years ago, but just now).
My friend with his same hardware as above, few years old (AVCHD input, rendering to .m2t, all settings to default, just multiplexing set to TS) - result: everything OK.
Why is video (rendered) shorter than the original timeline? Is it possible because of multiplexing to TS? If it is the reason, why Adobe left us to choose do we want to use multiplexig or not, when it causes such drastic problem? Why Adobe left us so much option to play with? They don't want to certificate every peace of hardware (graphic card, although many graphic cards are compatible and can be used "at our own risk") because, as they said, it can cause problems, and they left us so much option to change before rendering, and some of them causing problems and aren't compatible with each other If I check some box then I got bad result, and if I not check it, then everything is OK? Don't understand why they left us that option when it's not OK to use it, because it produce bad result?
Not to mention that rendering (AVCHD to H.264 or MPG2 Blu-ray) is significantly faster with i7 than with i5, because, as I can see, GPU Acceleration is not used at all for rendering (maybe just for few effects, that I didn't used yet).
THX!