Why is audio & video out of sync in the source monitor?

It is my second day with Premiere Pro CS5.5. I dit something and now is the source material out of sync. I re-imported the clip but it is still out of sync. All the other videos are fine. Please help!

Not nearly enough information for anyone to try and help
Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037?tstart=0
What is a CODEC... a Primer http://forums.adobe.com/thread/546811?tstart=0
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037?tstart=0
Report back with the codec details of your file, use the programs below
For PC http://www.headbands.com/gspot/ or http://mediainfo.sourceforge.net/en
For Mac http://mediainfo.massanti.com/
http://blogs.adobe.com/premiereprotraining/2011/02/red-yellow-and-green-render-bars.html
Once you know exactly what it is you are editing, report back with that information... and your project setting, and if there is a red line above the video in the timeline, which indicates a mismatch between video and project
More information needed for someone to help http://forums.adobe.com/thread/416679
Some is general about your computer and OS, some is specific to video editing
Build a Configuration file http://www.piriform.com/speccy
Brand/Model Computer (or Brand/Model Motherboard if self-built)
How much system memory you have installed, such as 2Gig or ???
Operating System version, such as Win7 64bit Pro... or whatevevr
-including your security settings, such as are YOU the Administrator
-and have you tried to RIGHT click the program Icon and then select
-the Run as Administrator option (for Windows, not sure about Mac)
Your Firewall settings and brand of anti-virus are you running
Brand/Model graphics card, sush as ATI "xxxx" or nVidia "xxxx"
-or the brand/model graphics chip if on the motherboard
-and the exact driver version for the above graphics card/chip
-and how much video memory you have on your graphics card
Brand/Model sound card, or sound "chip" name on Motherboard
-and the exact driver version for the above sound card/chip
Size(s) and configuration of your hard drive(s)... example below
-and how much FREE space is available on each drive (in Windows
-you RIGHT click the drive letter while using Windows Explorer
-and then select the Properties option to see used/free space)
Windows Indexing is BAD http://forums.adobe.com/thread/676303
While in Properties, be sure you have drive indexing set OFF
-for the drive, and for all directories, to improve performance
Some/Much of the above are available by going to the Windows
Control Panel and then the Hardware option (Win7 option name)
OR Control Panel--System--Hardware Tab--Device Manager for WinXP
And the EXACT type and size of file that is causing you problems
-for pictures, that includes the camera used and the pixel dimensions
Plus Video-Specific Information http://forums.adobe.com/thread/459220?tstart=0
Read Bill Hunt on editing a VOB/MPG file http://forums.adobe.com/thread/464549?tstart=0
Edit Vob http://premierepro.wikia.com/wiki/FAQ:How_do_I_import_VOB_files_/_edit_a_DVD%3F
Read Hunt on Using MOD/TOD files http://forums.adobe.com/thread/699990?tstart=0
Work through all of the steps (ideas) listed at http://forums.adobe.com/thread/459220?tstart=0
If your problem isn't fixed after you follow all of the steps, report back with ALL OF THE DETAILS asked for in the FINALLY section at the troubleshooting link
Also read file troubleshooting http://kb2.adobe.com/cps/407/kb407928.html

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A link with many ideas about computer setup http://forums.adobe.com/thread/436215?tstart=0
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Hard to believe there are no takers.
Hardly surprising. You didn't really ask a question to which readers could respond nor do you seem to be looking for a workaround for your unexplained and rather circuitous workflow. I did attempt to duplicate the download/conversion process using my own system, software, and workflows but since you did not include any particular YouTube source file (i.e., URL) reference and my results were different than yours, I can't even be sure I started with the same content as you. Basically, such sync problems normally devolve from a problem in the source file or in the processes used to download and/or convert the content.
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When importing into Premiere Elements 10 on a Windows 7 (64bit) PC, the audio and video are sometimes out sync when editing, and when they are rendered to the final product, they are always out of sync.
I have tried changing to other formats (.avi), as some people stated that variable frame rate issues can come up when using a non-camcorder to record video, but the .avi actually made it worse, to the point that only the audio played.
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nierielimladris
I have downloaded your AVCHD.mp4 video, checked its properties, and studied its performance in Premiee Elements 10 Windows 7 64 bit from the point of view of import, playback of rendered Timeline in Edit Mode monitor, and playback of an AVCHD.mp4 export of that Timeline content. I stared into the monitor to watch the lip movements as the sound played back. In any of the following I have not observed any out of sync audio.
MediaInfo basic properties included
a. AVCHD video compression, frame size 1280 x 720 @ 15.119 progressive frames per second (variable frame rate with minimum = 13.501 and maximum at 18.793)
b. AAC audio, mono.
Premiere Elements 10 project preset that I used was
NTSC
AVCHD
AVCHD LITE 720p24
In Project media, Interpret Footage told me that it recognized a frame rate of 15.0710.
Rendered the Timeline content and watched the lip movement as I listened to the audio. No out of sync audio.
For export,
Share
Computer
AVCHD
Presets = MP4 HD720p24
under the Advanced Button/Video Tab, I set for 1220 x 720 @ 15 progressive frames per second. The export settings dialog under Advanced Button/Video Tab looked like the following
I watched the playback of this AVCHD.mp4 export and again did not observe any out of sync audio.
All video playbacks were with Windows Media Player 12.
Have you worked specifically with the video clip that you provided for download? If you have and you
found out of sync audio, then I am suspecting that this might be a system rather than a video problem.
It is a way out stretch, but...there have been some strange display goings on with Premiere Elements 10 and NVIDIA video card drivers recently. For all these cases, the answer has been rolling back the video card driver instead of the typical "making sure you have the latest version of the driver installed". What video card are you using in your computer?
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I have Windows 7 64 bit
6 GB or Ram, Quad core i7 920 cpu
2x Nvidia Geforce 285 - I have tried running it in SLI and not in SLI
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Why is audio & video out of sync in the source monitor?

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