返回当前帧并且不向下一帧推进。

Returns the current frame without advancing the playhead.

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当播放一帧视频时，下一帧很有可能是一样的。

When a single frame of video is displayed, there is a high probability the next frame is the same.

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其结果是，每帧绘制在下一帧之上，造成涂片效果。

The result is that each frame is drawn over the next, resulting in a smear-looking effect.

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