Sync issue between audio and video in mp4

Hi, I recorded narrations to WAV in audacity and synced that up with a recording of my powerpoint slides. The resulting MP4 synced just fine. However when I upload that MP4 to a video site like youtube or try to stream it from amazon s3, there is a slight lag on the audio that is throwing the audio and video out of sync for streaming online. The sync is perfect on my computer as mp4 played in WM player, but when it comes to streaming it online, the audio lags slightly.

Does anyone know the solution to this? Maybe I got something wrong in the mp4 conversion process with the bit-rate or something? If anyone knows the answer, it would be much appreciated.

Thanks and best wishes

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