Online Video/Audio de-synchronization

[Lord Torath]

When I'm watching online videos, the audio and video start out synchronized, but within a few minutes, the video is behind the sound by about a half second, and it gets worse the longer the video runs. If I hit pause, the audio and video re-sync. But of course, they are noticeably out-of-sync again in a few minutes.

Anyone know why this happens? Is there anything I can do to get them to sync properly for the full duration of a video?

[georgie_leech]

Use different videos? IME it is usually specific to the file that was uploaded, and using another player or another website clears it up.

[Lord Torath]

YouTube, Vimeo, it doesn't seem to make a difference. At home, or at work, with Firefox or Chrome, within 4-5 minutes the audio and video are noticeably out-of-sync.