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我使用mp4数据提取php脚本.这将返回一个stdClass对象,如下所示.任何人都可以告诉我如何从下面的对象显示持续时间.谢谢

stdClass Object
(
    [hasVideo] => 1
    [hasAudio] => 1
    [video] => stdClass Object
        (
            [width] => 472
            [height] => 360
            [codec] => 224
            [codecStr] => H.264
        )

    [audio] => stdClass Object
        (
            [codec] => 224
            [codecStr] => AAC
        )

    [duration] => 622.8
)