Comments (3)
短视频最好的方案就是重新录制一遍,目前像微视等APP也是这么处理的。因为这里涉及很多东西要处理,字幕、特效等跟播放的时间有关,重新播放一遍会,播放过程不输出声音就好。要不然音视频轨道分离处理的话,一些转场动画啥的不好处理,有可能引入音视频不同步等问题。
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我在添加特效的时候记录下来添加每次添加特效的种类、开始时间、结束时间。然后点击上传或者保存按钮的时候,显示等待效果,将这个视频重新录制一遍是这个意思吗?测试了一下微视的效果,视频编辑特效后等待时长确实和视频本身的时长有一定的关联,而且时间相近。
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是的,目前那些看着合成很快的方案都是这么搞的。跟视频本身时长相近就是因为重新播放,播放时重新录制一遍而已。因为如果要插入转场动画之类的,一帧一帧地处理是非常麻烦的,时间戳会跟音频的不一致,引入的问题会非常非常多,怎么同步都是个问题。但是重新录制一遍,我就能保证跟我预览的一样。就算为了更好地压缩大小,用x264 和 AAC软编码来做录制,时间也不会比硬编码长多少的。720P的视频只不过是做不到百分百实时软编码而已,但合成阶段我不丢帧,直接等待录制流程处理完数据播放器再播放就好,反正时间戳我能保证就行。这就是合成时间总是比视频时长一点的原因。
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