合并iOS中的视频

Question

I'm using this wonderful tutorial to load 2 videos and merge them in iOS.

http://www.raywenderlich.com/13418/how-to-play-record-edit-videos-in-ios

I'd like to adapt this to be able to handle unlimited videos selected by the user, but am struggling. How do I create an array of AVAsset objects that can then be combined into a single video?

Answer 1

I save each video's MediaURL in an array which I then use to read each video from when I want to merge them. You can see more of it in my question here

Note how I handle the insert time after each merge.

Answer 2

Its pretty easy to extend it to any number of videos. All you need is their URL. In the tutorial you mentioned they merge two videos so you know the basics. Just look at this tutorial . It matches exactly your requirement and easy to understand.

You just have to implement getRandomVideoFileURL method. Create an array of all video's URL. Pass the index of loop (i) and get the URL.

UPDATE : To add instructions, put this part in your loop:

AVMutableVideoCompositionInstruction *videoCompositionInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
videoCompositionInstruction.timeRange = CMTimeRangeMake(time, assetTrack.timeRange.duration);
videoCompositionInstruction.layerInstructions = @[[AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoCompositionTrack]];
[instructions addObject:videoCompositionInstruction];

Then, after the loop form AVMutableVideoComposition like this:

AVMutableVideoComposition *mutableVideoComposition = [AVMutableVideoComposition videoComposition];
mutableVideoComposition.instructions = instructions;
mutableVideoComposition.frameDuration = CMTimeMake(1, 30);
mutableVideoComposition.renderSize = size; 

Change the variable names as you need, as I don't know which tutorial you are following.