我试图将一个音频文件与视频文件混合，但出现错误。“导出失败：操作无法完成”
如果有错误，请更正此代码。
我的代码：
-(void)CompileFilesToMakeMovie
{
AVMutableComposition* mixComposition = [AVMutableComposition composition];
NSString *str=[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"bgsong.mp3"];
NSString* audio_inputFilePath =str;
NSURL* audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath];
NSString* video_inputFileName = @"movie.mp4";
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *video_inputFilePath = [documentsDirectory stringByAppendingPathComponent:video_inputFileName];
NSURL* video_inputFileUrl = [NSURL fileURLWithPath:video_inputFilePath];
NSString* outputFileName = @"outputFile.mp4";
NSString* outputFilePath = [documentsDirectory stringByAppendingPathComponent:outputFileName];
NSURL* outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath])
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
CMTime nextClipStartTime = kCMTimeZero;
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];
CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime error:nil];
//nextClipStartTime = CMTimeAdd(nextClipStartTime, a_timeRange.duration);
AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero, audioAsset.duration);
AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];
AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
_assetExport.outputFileType = @"com.apple.quicktime-movie";
_assetExport.outputURL = outputFileUrl;
[_assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
BOOL _success = false;
switch ([_assetExport status]) {
case AVAssetExportSessionStatusCompleted:
_success = true;
NSLog(@"Export Completed");
break;
case AVAssetExportSessionStatusWaiting:
NSLog(@"Export Waiting");
break;
case AVAssetExportSessionStatusExporting:
NSLog(@"Export Exporting");
break;
case AVAssetExportSessionStatusFailed:
{
NSError *error = [_assetExport error];
NSLog(@"Export failed: %@", [error localizedDescription]);
break;
}
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export canceled");
break;
default:
break;
}
if (_success == true) {
ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];
[assetLibrary writeVideoAtPathToSavedPhotosAlbum:outputFileUrl completionBlock:^(NSURL *assetURL, NSError *error){
NSError *removeError = nil;
[[NSFileManager defaultManager] removeItemAtURL:outputFileUrl error:&removeError];
}];
}
}
];
}
提前致谢