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SOLUTION!!! - Like many of you, I've been struggling with audio sync problems for years when producing my videos. Sometimes the problem is evident on the mp4 file itself, and other times it doesn't occur until after burning to a disc. I finally found a solution that has worked consistently for me, and will hopefully also work for you. The solution is to produce your clips in m2ts format rather than mp4. The quality is exactly the same, but it seems only the mp4 format is subject to the audio sync problems. If you are using PowerDirector, after selecting your production format (I use H.264 AVC), you'll see a small drop-down menu below the format that lets you choose the file type. The menu shows: M2TS, MP4, and MKV. Choose M2TS. Below that, choose your video quality. (I use AVC 1920 x 1080/60i (24 Mbps) for Blu-ray quality.) When you burn the produced video to disc, you should not notice any sync issues.
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