AVAssetExportSession-在IOS中加入2个mp4文件 [英] AVAssetExportSession - Join 2 mp4 files in IOS
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问题描述
我正在尝试使用以下代码在ipad2上将2个已存在的mpeg4视频合并在一起.
I am trying to join 2 preexisting mpeg4 video's together on an ipad2 with the following code.
-(void)mergeTestVideos
{
//setup asset
NSString *firstassetpath = [NSString stringWithFormat:@"%@mpeg4-1.mp4", NSTemporaryDirectory()];
NSString *secondassetpath = [NSString stringWithFormat:@"%@mpeg4-2.mp4", NSTemporaryDirectory()];
NSFileManager *fileManager = [NSFileManager defaultManager];
AVAsset *firstAsset = [AVAsset assetWithURL:[NSURL fileURLWithPath:firstassetpath]];
AVAsset *secondAsset = [AVAsset assetWithURL:[NSURL fileURLWithPath:secondassetpath]];
NSLog(@"FirstAsset Is Readable = %d", firstAsset.isReadable);
NSLog(@"FirstAsset Is playable = %d", firstAsset.isPlayable);
NSLog(@"FirstAsset Is exportable = %d", firstAsset.exportable);
NSLog(@"SecondAsset Is Readable = %d", secondAsset.isReadable);
NSLog(@"SecondAsset Is playable = %d", secondAsset.isPlayable);
NSLog(@"SecondAsset Is exportable = %d", secondAsset.exportable);
//setup composition and track
AVMutableComposition *composition = [[AVMutableComposition alloc]init];
AVMutableCompositionTrack *track = [composition addMutableTrackWithMediaType:AVAssetExportPresetPassthrough preferredTrackID:kCMPersistentTrackID_Invalid];
//add assets to track
[track insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration) ofTrack:[[firstAsset tracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0] atTime:kCMTimeZero error:nil];
[track insertTimeRange:CMTimeRangeMake(kCMTimeZero, secondAsset.duration) ofTrack:[[secondAsset tracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0] atTime:firstAsset.duration error:nil];
// 5 - Create exporter
AVAssetExportSession *exporter = [[AVAssetExportSession alloc]initWithAsset:composition presetName:AVAssetExportPresetPassthrough];
NSString *outputURL = [NSString stringWithFormat:@"%@mergedvid.mp4", NSTemporaryDirectory()];
NSLog(@"%@", exporter.supportedFileTypes);
exporter.outputURL=[NSURL fileURLWithPath:outputURL];
exporter.outputFileType = AVFileTypeMPEG4;
[exporter exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
[self exportDidFinish:exporter];
});
}];
}
-(void)exportDidFinish:(AVAssetExportSession*)session {
NSLog(@"export method");
NSLog(@"%i", session.status);
NSLog(@"%@", session.error);
}
输出如下:
- FirstAsset Is Readable = 1
- FirstAsset Is playable = 1
- FirstAsset Is exportable = 1
- SecondAsset Is Readable = 1
- SecondAsset Is playable = 1
- SecondAsset Is exportable = 1
- (
"com.apple.quicktime-movie",
"com.apple.m4a-audio",
"public.mpeg-4",
"com.apple.m4v-video",
"public.3gpp",
"org.3gpp.adaptive-multi-rate-audio",
"com.microsoft.waveform-audio",
"public.aiff-audio",
"public.aifc-audio",
"com.apple.coreaudio-format"
)
-export method
- 4
- Error Domain=AVFoundationErrorDomain Code=-11838 "Operation Stopped" UserInfo=0x155f76f0 {NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=The operation is not supported for this media.}
好的,根据输出,我的文件是可以导出的,并且mp4是受支持的输出类型.
Ok so according to the output my files are ok and exportable and mp4 is a supported output type.
有人知道为什么它会给我错误信息此媒体不支持该操作"
Does anybody have any idea why it is giving me the error 'The operation is not supported for this media'
推荐答案
我认为这是您的罪魁祸首
I think this statement is your culprit
AVMutableCompositionTrack *track = [composition addMutableTrackWithMediaType:AVAssetExportPresetPassthrough preferredTrackID:kCMPersistentTrackID_Invalid];
您在这里传递AVAssetExportPresetPassthrough
,您应该在其中使用AVMediaTypeVideo
或AVMediaTypeAudio
Here you are passing AVAssetExportPresetPassthrough
where you should have used AVMediaTypeVideo
or AVMediaTypeAudio
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