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DM365 HDVICP压缩录像时长大于播放器(Windows Media Player)播放时长

我们用HDVICP做MPEG4或H.264压缩时,发现压缩市场大于播放器(Windows Media Player)播放时长,现象表现为播放快进。往往15分钟时长录像播放时只有13分钟多一点或不到13分钟。不知什么原因?谢谢!