MediaPlayer.seekTo(t)为什么不转到确切的指定瞬间"t"? [英] Why doesn't MediaPlayer.seekTo(t) go to the exact specified instant "t"?

问题描述

我正在尝试让媒体播放器在本地存储的视频中播放特定范围.我似乎没有在指定的时间开始.

I'm trying to get the media player to play a specific range in a locally stored video. It doesn't seem to start at the specified time I tell it to.

示例:当我寻求1000时，它可以工作.但是当我寻求1500时，它将改为2000.

Example: when I seek to 1000, it works. But when I seek to 1500, it goes to 2000 instead.

我还尝试过暂停搜索，然后从搜索完成开始，这没有任何区别.

I also tried pausing seeking then starting on seek completion, it doesn't make any difference.

这是代码:

mediaPlayer.start();
mediaPlayer.seekTo(time);

这正常吗?还是我以错误的方式使用媒体播放器?

Is this normal? Or am I using the media player the wrong way?

推荐答案

这是一个编码问题.视频具有关键帧( i帧)，该关键帧比其他帧存储更多的信息.仅在给定前一个关键帧的情况下才能构建非关键帧.尝试显示非关键帧将显示绿色斑点和像素化抖动屏幕.

This is an encoding issue. Videos have keyframes (i-frames) that store more information than other frames. A non keyframe can be built only given the previous keyframe. Trying to display a non keyframe will show green spots and pixelated jittery screen.

现在，在某些android设备上，尚未实现解决方法，因此您会遇到这种奇怪的行为.例如，在Nexus S上，seekTo()不一定会转到指定的帧.我尝试了其他具有相同Android版本的设备，但它们查找得很好.

Now, on some android devices there's no workaround implemented for this so you get this weird behavior. On a Nexus S for example seekTo() doesn't necessarily go to the specified frame. I tried other devices with the same android version and they seek just fine.

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