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Northwest 路 M
Video is encoded separately from audio, and when streamed, the streams may travel separately. special encoding tells players how to synchronize playback, and internally, separate circuitry plays the audio and video, so every once in a while, all the pieces may not fit together as they're supposed, and you notice a lag.
uncalled4 路 56-60, M
I think there's some instances in which the last available frame of video is "grabbed" while the audio still plays. Lots of HD files are "wrapped", so that the video is one file, and the audio tracks are separate...hopefully they all play back together.