iOS 把两个视屏合并成一个视频详细

Posted 2023-02-16

参考技术A - （void）viewDidLoad

      [superviewDidLoad];

      self.array 里面放的是两个视频的地址  ，类型为NSurl

  path 是你合并后的存放的地址路径

        [self mergeAndExportVideos:self.array withOutPath:path];

 

- (void)mergeAndExportVideos:(NSMutableArray*)videosPathArraywithOutPath:(NSString*)outpath



      AVMutableComposition*mixComposition  =[[AVMutableComposition alloc]init];

//音频轨道

AVMutableCompositionTrack*audioTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];

//视频轨道

AVMutableCompositionTrack*videoTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeVideo

preferredTrackID:kCMPersistentTrackID_Invalid];

CMTime totalDuration =kCMTimeZero;

for(inti =0; i < videosPathArray.count; i++)

//AVURLAsset：AVAsset的子类，此类主要用于获取多媒体的信息，包括视频、音频的类型、时长、每秒帧数，其实还可以用来获取视频的指定位置的缩略图。

AVURLAsset*asset = [AVURLAssetassetWithURL:videosPathArray[i]];

NSError*erroraudio =nil;

//获取AVAsset中的音频

AVAssetTrack*assetAudioTrack = [[assettracksWithMediaType:AVMediaTypeAudio]firstObject];

//向通道内加入音频

BOOLba = [audioTrackinsertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration)

ofTrack:assetAudioTrack

atTime:totalDuration

error:&erroraudio];

NSLog(@"erroraudio:%@%d",erroraudio,ba);

NSError*errorVideo =nil;

//获取AVAsset中的视频

AVAssetTrack*assetVideoTrack = [[assettracksWithMediaType:AVMediaTypeVideo]firstObject];

//向通道内加入视频

BOOLbl = [videoTrackinsertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration)

ofTrack:assetVideoTrack

atTime:totalDuration

error:&errorVideo];

NSLog(@"errorVideo:%@%d",errorVideo,bl);

totalDuration =CMTimeAdd(totalDuration, asset.duration);



//创建合成后写入的路劲

NSURL*mergeFileURL = [NSURLfileURLWithPath:outpath];

if([[NSFileManagerdefaultManager]fileExistsAtPath:outpath])



NSLog(@"有文件");

return;



//这里开始导出合成后的视频

AVAssetExportSession*exporter = [[AVAssetExportSessionalloc]initWithAsset:mixComposition

presetName:AVAssetExportPreset640x480];

exporter.outputURL= mergeFileURL;

NSLog(@"%@",exporter.supportedFileTypes);

if([self.typeisEqualToString:@"mp4"])

exporter.outputFileType=AVFileTypeMPEG4;

else



exporter.outputFileType=AVFileTypeQuickTimeMovie;



exporter.shouldOptimizeForNetworkUse=YES;

[exporter exportAsynchronouslyWithCompletionHandler:^

//导出的状态

switch(exporter.status)

caseAVAssetExportSessionStatusUnknown:

NSLog(@"exporter Unknow");

break;

caseAVAssetExportSessionStatusCancelled:

NSLog(@"exporter Canceled");

break;

caseAVAssetExportSessionStatusFailed:

//导出失败

NSLog(@"exporter Failed");

break;

caseAVAssetExportSessionStatusWaiting:

NSLog(@"exporter Waiting");

break;

caseAVAssetExportSessionStatusExporting:

NSLog(@"exporter Exporting");

break;

caseAVAssetExportSessionStatusCompleted:

//导出成功

NSLog(@"exporter Completed");

dispatch_async(dispatch_get_main_queue(), ^

//这里是回到你的主线程做一些事情

);

break;



];







- (void)clearCache



if([[NSFileManagerdefaultManager]fileExistsAtPath:self.outPath])



//这里是你可以删除你合成后的视频文件

//self.outPath 是你保存视频的路劲，当然你也可以通过该路劲删除它

NSLog(@"删除成功");

[[NSFileManager defaultManager] removeItemAtPath:self.outPath error:nil];