Why do my audio and video get out of synch?

No matter what sort of video I'm trying to play: Youtube, a movie on DVD, a movie on an external hard drive, etc, after a short time the audio and video get out of synch with each other. This is often, though not always, signaled by a short audio phrase being repeated (eg: "I don't know, Scully, how about you? about you?"). I can solve the problem by quitting the app and starting it back up but it will eventually screw up again.
I'm using a MacBook running OS 10.6.8 with a 2.26 GHz Intel Core 2 Duo processor and 4 GB 1067 MHz DDR3 memory.

MASMAS
The first thing that we need to know are the properties of what you are putting on the Timeline. What works in another software does not necessarily work in Premiere Elements. Each program has its own supported formats.
a. What is the file extension for this file? .MOV or .MP4?
b. Does the iPad describe it as 1080p or 720p?
c. If you open Premiere Elements 12 and go to Edit Menu/Project Settings/General, what do you see for Editing Mode, Timebase, Frame Size, and Pixel Aspect Ratio, even if those field appear to be grayed out.
Two immediate troubleshooting avenues are going to be in the direction of...
a. Project settings not set up to match the properties of the source from the iPad. Then we would start a new project and set the project setting manually before importing your video. Details for manually setting the project preset are in the following.
ATR Premiere Elements Troubleshooting: PE11: Accuracy of Automatic Project Preset (New Project Dialog) Setting
b. The iPad video being recorded with a variable frame rate instead of a constant one...the remedy then would probably be to take your video in a program like HandBrake to change the variable to a constant frame rate. And after that, import the corrected video into the Premiere Elements project which has the correct project preset (preferably set manual to assure the correct result).
Please see what you can put together in the way of video details, and we will sort this out.
Thanks.
ATR

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This seems to be a reoccurring problem for me and I'd love some help getting it resolved once and for all. After capturing footage, the audio and video are out of sync in the clip AND when I drag it to the timeline. When I go through each part, it looks like the video hesitates often, which seems to be causing the misalignment of audio. But, once it is moved into alignment, it goes out of sync again throughout the remainder of the one hour video.
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Welcome to Apple Discussions, m
See if any of the suggestions offered here reduce your sync quality problem enough:
http://discussions.apple.com/thread.jspa?messageID=7089133&#7089133
If, after making certain that your Mac is running well, has plenty of free space on the correct drive, etc., your sync is still not close enough, you can manually re-sync any parts that are unacceptable to you using either QT Pro or iMovie.
If you check carefully, you will see that not even pro video is always perfectly synced. It is a lot of work to get things "nearly perfect," but, with a bit of practice, it doesn't take long to get things "close enough" for me.
I use the same simple process with either QT Pro or iMovie, so you can use whichever you find easiest. Whichever you use, keep the original AV clip safe and *_work on a copy_* in case something goes wrong.
If you do not already know how, here is my process, but you can adjust for your workflow:
(1) Copy of the audio track.
(2) Add the audio track copy to the AV file.
(3) Silence the original audio and work on audio copy.
(4) Insert small blank audio clips (or split and slide if using iMovie) if needed to make the audio later.
(5) Cut small bits out of quiet parts (or split and shorten in iMovie) if needed to make audio sooner.
(6) Repeat until satisfied and delete any tracks no longer needed.
(7) Save the adjusted AV file.
(8) Enjoy!
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MASMAS
The first thing that we need to know are the properties of what you are putting on the Timeline. What works in another software does not necessarily work in Premiere Elements. Each program has its own supported formats.
a. What is the file extension for this file? .MOV or .MP4?
b. Does the iPad describe it as 1080p or 720p?
c. If you open Premiere Elements 12 and go to Edit Menu/Project Settings/General, what do you see for Editing Mode, Timebase, Frame Size, and Pixel Aspect Ratio, even if those field appear to be grayed out.
Two immediate troubleshooting avenues are going to be in the direction of...
a. Project settings not set up to match the properties of the source from the iPad. Then we would start a new project and set the project setting manually before importing your video. Details for manually setting the project preset are in the following.
ATR Premiere Elements Troubleshooting: PE11: Accuracy of Automatic Project Preset (New Project Dialog) Setting
b. The iPad video being recorded with a variable frame rate instead of a constant one...the remedy then would probably be to take your video in a program like HandBrake to change the variable to a constant frame rate. And after that, import the corrected video into the Premiere Elements project which has the correct project preset (preferably set manual to assure the correct result).
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With your big 2 hour clip in MPEG Streamclip, move the cursor to the start of the 5 minutes that "matters" and press i. Then move the cursor to the end of this 5 minute section, and press o.
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Yea it still won't let me post images, so here are the settings:
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field dominance: upper.
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Upon export, audio and video are out of sync.

While editing, my cuts are lined up with beats in the music, but after export they shift approximately 5 frames, making my cuts appear later.
The Sequence settings match the clip settings at 23.976 fps, and i've tried just about everything I can think of to fix the issue.
I've reverted back to previous Autosaves of the project, tried numerous export settings, separate and new projects, different machines, but nothing seems to work.
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Please UN-check the "Frame Blending" box, that is only used when changing frame rates. The source and export are both 23.976, so that can only cause issues (blurring between frames with motion). Also uncheck "Max Render Quality", that is used for SCALING, such as 1080 to 720, or HD to SD. Your source and destination are both 1080p.
Rule of thumb - do NOT check boxes unless you really know what they do and the results they provide - the DEFAULT settings are there for a reason ;-)
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I'm assuming the video source is also 23.976? If source doesn't match sequence settings, that can be an issue with sync.
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Last thing, what is the source of the video footage? Some phones use "Variable Bitrate" recording and Premiere is not equipped to deal with that very well.
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Im having the same issue I have a project that is 9 minutes long tried all before even looking at the forum but It will not sync. Some one even told me to repair the permissions so nothing worked. I went to the Mac store no body knew what I was talking about so they asked me to call Apple so I did and was hung up on 3 times not only that but I was advised since I just bought the product I did have 3 months of tech support.
I mean I'm having an issue and they tell me I have 90 days of free service? This has got to be a joke. I than asked well can I just take it back and instal my 09 back? I was advised nope you wont be able to do so and you cant get your money back.
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Why do my audio and video get out of synch?

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