扩展AVMutableComposition [英] Extending an AVMutableComposition

问题描述

我想在AVMutableComposition的末尾渲染一些图形，例如电影末尾的字幕.如何创建一个空白资产，该资产会延长合成时间，从而为我提供一些可以渲染的空白空间?

I would like to render some graphics to the end of my AVMutableComposition, like credits at the end of a movie. How can I create a blank asset that would extend the composition time to give me some blank space I can render to?

推荐答案

我找到了答案.它位于insertEmptyTimeRange方法中.一个例子:

I found the answer. It lies in the insertEmptyTimeRange method. An example:

//comp is an AVMutableComposition

float secondsToExtend = 5.0f;
long long timescale = comp.duration.timescale;
CMTime endTime = CMTimeMake(comp.duration.value - 1, timescale);
CMTime extendDuration = CMTimeMake(secondsToExtend * timescale, timescale);
CMTimeRange emptyTimeRange = CMTimeRangeMake(endTime, extendDuration);
[comp insertEmptyTimeRange:emptyTimeRange];

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