是否可以将两个视频文件合并为一个文件，在iOS中为一个屏幕? [英] Is it possible to merge two video files to one file, one screen in iOS?
问题描述
我是视频编程新手.我正在尝试锻炼它，但是遇到了麻烦，它将两个视频文件合并为一个.
I'm new to video programming. I'm trying to exercise it but I'm having trouble, which merges two video files to one.
我的意思是合并如下.
我有第一个这样的视频
第二个视频也这样
我希望他们这样合并
我不想使用2个视频播放器，因为我想将合并的视频文件发送给某人.我整日搜寻以解决这个问题，但找不到解决方法.
I didn't want to use 2 video players because I want to send the merged video file to someone. I searched all day to solve this, but I could't find how to.
I wrote code referencing this link but it shows first video only, not merged.
我的代码:
NSURL *firstURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"video1" ofType:@"mp4"]]
AVURLAsset *firstAsset = [[AVURLAsset alloc]initWithURL:firstURL options:nil];
NSURL *secondURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"video2" ofType:@"mp4"]];
VURLAsset *secondAsset = [[AVURLAsset alloc]initWithURL:secondURL options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCMPersistentTrackID_Invalid];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration)
ofTrack:[[firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
atTime:kCMTimeZero error:nil];
AVMutableCompositionTrack *secondTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCMPersistentTrackID_Invalid];
[secondTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, secondAsset.duration)
ofTrack:[[secondAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
atTime:kCMTimeZero error:nil];
[secondTrack setPreferredTransform:CGAffineTransformMakeScale(0.25f,0.25f)];
NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsDir = [dirPaths objectAtIndex:0];
NSString *outputFilePath = [docsDir stringByAppendingPathComponent:[NSString stringWithFormat:@"FinalVideo.mov"]];
NSLog(@"%@", outputFilePath);
NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath])
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
AVAssetExportSession* assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
assetExport.outputFileType = @"com.apple.quicktime-movie";
assetExport.outputURL = outputFileUrl;
[assetExport exportAsynchronouslyWithCompletionHandler: ^(void ) {
switch (assetExport.status) {
case AVAssetExportSessionStatusFailed:
NSLog(@"AVAssetExportSessionStatusFailed");
break;
case AVAssetExportSessionStatusCompleted:
NSLog(@"AVAssetExportSessionStatusCompleted");
break;
case AVAssetExportSessionStatusWaiting:
NSLog(@"AVAssetExportSessionStatusWaiting");
break;
default:
break;
}
}
];
我想念什么?我不知道该如何解决这个问题.
What am I missing? I don't know how I can approach this to solve the problem.
赞赏任何想法. 谢谢.
Appreciate any ideas. Thanks.
我写了一个新代码，引用了马特写的链接，谢谢马特.但是当我尝试导出它时，仅导出了第一个视频.不在一起..:(
i made a new code which referenced a link matt wrote, thanks matt. but when i tried to export it, only first video was exported. not together.. :(
我的新代码是..
NSURL *originalVideoURL1 = [[NSBundle mainBundle] URLForResource:@"video1" withExtension:@"mov"];
NSURL *originalVideoURL2 = [[NSBundle mainBundle] URLForResource:@"video2" withExtension:@"mov"];
AVURLAsset *firstAsset = [AVURLAsset URLAssetWithURL:originalVideoURL1 options:nil];
AVURLAsset *secondAsset = [AVURLAsset URLAssetWithURL:originalVideoURL2 options:nil];
AVMutableComposition* mixComposition = [[AVMutableComposition alloc] init]; //[AVMutableComposition composition];
NSError *error = nil;
AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration) ofTrack:[[firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:&error];
if(error) {
NSLog(@"firstTrack error!!!. %@", error.localizedDescription);
}
AVMutableCompositionTrack *secondTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[secondTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, secondAsset.duration) ofTrack:[[secondAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:&error];
if(error) {
NSLog(@"secondTrack error!!!. %@", error.localizedDescription);
}
AVMutableVideoCompositionInstruction *mainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, firstAsset.duration);
AVMutableVideoCompositionLayerInstruction *firstLayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:firstTrack];
CGAffineTransform scale = CGAffineTransformMakeScale(0.7, 0.7);
CGAffineTransform move = CGAffineTransformMakeTranslation(230, 230);
[firstLayerInstruction setTransform:CGAffineTransformConcat(scale, move) atTime:kCMTimeZero];
AVMutableVideoCompositionLayerInstruction *secondLayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:secondTrack];
CGAffineTransform secondScale = CGAffineTransformMakeScale(1.2, 1.5);
CGAffineTransform secondMove = CGAffineTransformMakeTranslation(0, 0);
[secondLayerInstruction setTransform:CGAffineTransformConcat(secondScale, secondMove) atTime:kCMTimeZero];
mainInstruction.layerInstructions = @[firstLayerInstruction, secondLayerInstruction];
AVMutableVideoComposition *mainCompositionInst = [AVMutableVideoComposition videoComposition];
mainCompositionInst.instructions = @[mainInstruction];
mainCompositionInst.frameDuration = CMTimeMake(1, 30);
mainCompositionInst.renderSize = CGSizeMake(640, 480);
AVPlayerItem *newPlayerItem = [AVPlayerItem playerItemWithAsset:mixComposition];
newPlayerItem.videoComposition = mainCompositionInst;
AVPlayer *player = [[AVPlayer alloc] initWithPlayerItem:newPlayerItem];
AVPlayerLayer *playerLayer =[AVPlayerLayer playerLayerWithPlayer:player];
[playerLayer setFrame:self.view.bounds];
[self.view.layer addSublayer:playerLayer];
[player seekToTime:kCMTimeZero];
[player play]; // play is Good!!
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *tempS2 = [documentsDirectory stringByAppendingPathComponent:@"FinalVideo.mov"];
if([[NSFileManager defaultManager] fileExistsAtPath:tempS2])
{
[[NSFileManager defaultManager] removeItemAtPath:tempS2 error:nil];
}
NSURL *url = [[NSURL alloc] initFileURLWithPath: tempS2];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]
initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
exportSession.outputURL=url;
NSLog(@"%@", [exportSession supportedFileTypes]);
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
if (exportSession.status==AVAssetExportSessionStatusFailed) {
NSLog(@"failed");
}
else {
NSLog(@"AudioLocation : %@",tempS2);
}
}];
我如何导出我的mixComposition和layerInstruction两者?
how can i export my mixComposition and layerInstruction both?
请给我更多一些想法.
谢谢.
推荐答案
参考第二次编辑中的代码，就像您已经将AVMutableVideoComposition告诉了AVPlayerItem一样，您还需要告诉AVAssetExportSession也是:
With reference to the code in your second edit, just as you've told the AVPlayerItem about your AVMutableVideoComposition, you need to also tell the AVAssetExportSession too:
exportSession.videoComposition = mainCompositionInst;
// exportAsynchronouslyWithCompletionHandler etc
不适用:请确保在设置指令时长时选择两个音轨时长中的较长者:
N.B. make sure you choose the longer of the two track durations when setting your instruction duration:
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMaximum(firstAsset.duration, secondAsset.duration));
AVPlayer不会介意是否弄错了，但是AVAssetExportSession会并且会返回AVErrorInvalidVideoComposition(-11841)错误.
AVPlayer doesn't mind if you get this wrong, but AVAssetExportSession does and will return an AVErrorInvalidVideoComposition (-11841) error.
N.B. 2 您的AVPlayer实际上并没有超出范围，但是当我看着它时，让我感到紧张.如果您是我，我会将其分配给一个物业.
N.B. 2 Your AVPlayer isn't actually going out of scope, but it makes me nervous when I look at it. I'd assign it to a property if I were you.
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