MP4 video files have out of sync audio?

When I import an MP4 video into Premiere Pro CS5.5, I noticed that while playing it the audio gradually becomes out of sync. I am unsure as to what causes this, but when I play the exact same video in an external player (like VLC) the audio is fine.
I've tried using Audition to export the audio from the video as a WAV file, but upon importing that into PP CS5.5, I discovered that it becomes much worse.
I'm not sure at this point if the audio is the issue or the video is the issue, but I'd really like an answer.
Audio settings are at 48 kHz for the audio itself and the sequence in Premiere Pro.
Thanks.

Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037
What is a CODEC... a Primer http://forums.adobe.com/thread/546811
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037
Report back with the codec details of your file, use the programs below... a screen shot works well to SHOW people what you are doing
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
Also, See 2nd post for picture of NEW ITEM process http://forums.adobe.com/thread/872666

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You deleted the original footage before you verified anything !
Sorry, this is just <princess bride voice> inconceivable <pbv off>
Use MPEG Streamclip or DVDxDV to extract a DV NTSC file from the VOB files.
Drop that in the time line.
export the audio as an AIFF file
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x
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Hi -
Barbara Smits wrote:
I have not had a problem with this before,
meaning you have done this exact procedure successfully before?
but suddenly I have out-of-sync audio when mixing six channels in FCP. Using my Canon XL1-S, I recorded 4 channels of audio in 12 bit mode, 32 khz. I then added another two channels of audio from a separate Sony digital recorder into the FCP edit.
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I Have some files in HD, this files plays without problem in Quicktime,
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Ok thank you SHANE for your answers.
I didnt explain the situation complete, sorry.
This is the story:
Im a new in a MAC WORLD'S and of course in a FCP too.
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I HAVE a G5 QUAD CORE 2.5 512 MB RAM
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SORRY for MY English.
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Welcome to our community
You might try re-posting your issue in a Flex forum.
While this forum certainly discusses Audio/Video issues, it's intended for Audio/Video issues related to using Adobe Captivate.
Click here to visit the Flex forum
Best of luck to you in resolving your issue! Rick

MP4 video files have out of sync audio?

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