Currently Being ModeratedJun 29, 2013 12:57 AM (in response to LSatch)
After experiencing this and reading a few posts here I discovered a solution for myself.
Windows 7 Professional 64 bit.
Go to sound icon lower right side, right click
choose sound playback
click on active device
click on properties
click on advanced
You will see a dropdown bar which lists various 16 and 24 bit sampling rates
Its the bits and Hz values you need to focus on.
Go to iTunes click on the upper left hand icon for drop down menu
You'll notice iTunes also has both bit rates 16 and 24 as well as Hz values.
44.1 was the lowest Hz setting on iTunes
I set both my windows settings to 24 bit and 44 Hz as well as iTunes and this cleared up the problem.
There are several things going on here (if you want further understanding). Matching the values is apparently essential for iTunes media because they have very strict encoding standards. If your OS setting is at a higher bit rate/frequency than the media then it does something called oversampling. When your PC doesn't adjust correctly for oversampling the result is its pushing the digital audio signal through "too fast" Thus the words and action in the scenes are out of synch. If the pc setting is lower than the media setting then you get undersampling and the lack of effective compensation for this causes problems as well. In either situation if your pc and media aren't on the same page then your pc is doing EXTRA work to try to adapt to the media with an inaccurate sampling setting.
Currently Being ModeratedOct 27, 2013 9:07 AM (in response to robibby)
last post.. matching the rates definately fixed the video I was watching. For some weird reason, videos in my library which I'd already viewed still stuttered (video stopped and the caught back up with the audio). I went back to the library, right clicked the video which was still a problem, and selected "RESET PLAYS", it then played absolutely perfectly. Begs the question why, but anyway, there it is.
Currently Being ModeratedDec 2, 2013 3:32 PM (in response to facepalmmonkey)
Interesting. I still get updates to this thread and a recent critical post landed in my inbox but yet does not appear to be here? It wasn't offensive (aside from mentioning Windows 8 and that OS itself is almost enough to turn me to the Apple dark side) so I wonder what happened to it?
Sorry to see people still having issues. Mine were resolved until I bought a new PC. Now I have to start all over again. It really shouldn't be this hard just to get a video to play correctly. My choppyness is gone but now I have s lag on the sound instead. It's like being at an old skool cinema whrn they start the audio track a fraction too early.
Hopefully this won't get removed, but I am posting from my Samsung phone so I expect that won't go down overbig.
Currently Being ModeratedJan 14, 2014 5:39 PM (in response to zerostatetechnologies)
Bit settings didn't match. Such an easy fix...that I probably never would have stumbled on considering it's been driving me nuts for months and I think I looked at both those properties. It's only easy in hindsight.
Currently Being ModeratedFeb 4, 2014 2:31 PM (in response to Katayanagi)
One fix that was mentioned earlier was changing the playback quality to 720p when that was all that was asked for. I downloaded a digital copy of Star Trek Into Darkness after getting the Blu-Ray. Yeah, it was just handy to have the digital copy on my laptop for those Star Trek emergency moments. I'd been playing it at 1080p in iTunes on my laptop, and I was getting that jerking motion (though not as bad as some of you). There would be a minute jerkiness, where a frame would skip with audio fine. In the opening titles, you could see the letters jumping backwards just momentarily. I rightclicked on the entry for ST and saw that the preferred playback should have been in 720p. So, under the Edit/Preferences Menu in Itunes, I selected the playback option and changed the Preffered Video Version to 720p and voila... No jerkiness.... and still decent HD. So maybe this is simply a version issue. I don't download movies or tv from iTunes at all, and simply try and buy Blu-Rays with digital codes, but I'n surprised the standard isn't 1080p
Hope this helps at least some of you....always check the preffered playback version...
Currently Being ModeratedFeb 11, 2014 7:05 AM (in response to joemhoward)
I'm still getting choppy playback on all of my purchased and digital copy films after trying the settings recommended here. Is there any software that could help with the problem? Could using windows 8 operating system create any problems?
Currently Being ModeratedFeb 26, 2014 8:15 PM (in response to zerostatetechnologies)
thanks for this information. I just put a system together and it is not lacking in resources. Everything was working perfectly until I tried to watch one of my many itunes purchased movies. (.m4v).
I tried everything then I saw your note on matching the audio settings in itunes preferences and playback devices. It worked perfectly. It is amazing how something like this can cause so many headaches.
I'm using Win 8.1