Android中的视频清理是否需要MediaCodec-MediaExtractor组合？
[英]Is the MediaCodec-MediaExtractor combo necessary for video scrubbing in Android?
问题描述
I'm implementing a slider that lets me choose the frame I want to save as an image, and as everyone probably knows, the seekTo() function of Android's default MediaPlayer sucks - it doesn't actually seek to the closest frame to the timestamp, but to the closest I-frame, meaning the sought-after frame can be off by as much as a few seconds. 
我正在实现一个滑块，该滑块使我可以选择要保存为图像的帧，并且众所周知，Android默认MediaPlayer的seekTo()函数很烂-它实际上并没有寻求最接近时间戳的帧，但是最接近的I帧，这意味着所需的帧可能会偏离几秒钟之久。
That's why I'm considering making a custom MediaPlayer implementation that uses MediaCodec and MediaExtractor . 这就是为什么我要考虑使用MediaCodec和MediaExtractor定制MediaPlayer实现。 Are they necessary for exact seeking? 是否需要精确寻找？
1 个解决方案
解决方案1
1 2016-10-10 09:04:20
Use ExoPlayer instead, it will save you time and headache. 改用ExoPlayer，它将节省您的时间和头痛。
https://github.com/google/ExoPlayer https://github.com/google/ExoPlayer
If you still want to make your own video player, MediaExtractor can not do the accurate seek (in fact it should not seek to frame other than I frame, since decoding can only starts from I frame) 如果您仍想制作自己的视频播放器， MediaExtractor将无法进行精确搜索（实际上，它不应搜索除I帧以外的其他帧，因为解码只能从I帧开始）
So what you should do is seek to previous I frame using MediaExtractor and start decoding frame from that point using MediaCodec ( you can discard the result ) until you reach your desired frame. 因此，您应该做的是使用MediaExtractor搜索先前的I帧，然后使用MediaCodec从该点开始解码帧（您可以丢弃结果），直到达到所需的帧为止。
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