标签: avassetexportsession

我正在使用下一个代码片段同步loadValues,所以loading = NO永远不会触发.我对AVAssetExportSession exportAsynchronously有同样的问题. 这一切都不适用于设备.

NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:URL options:options];

NSArray *keys = [NSArray arrayWithObjects:@"duration", @"tracks", nil];

__block bool loading = YES;

[asset loadValuesAsynchronouslyForKeys:keys completionHandler:^(void) {
            loading = NO;
}];

while (loading)[[NSRunLoop currentRunLoop] runUntilDate:[[NSDate date] dateByAddingTimeInterval:0.5]];

请帮忙!我的大脑在融化.

我目前正在尝试使用 AVMutableComposition 将 5 个视频背靠背放置，如下所示：

[mixComposition insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset1.duration) ofAsset:asset1 atTime:[mixComposition duration] error:nil];
[mixComposition insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset2.duration) ofAsset:asset2 atTime:[mixComposition duration] error:nil];
[mixComposition insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset3.duration) ofAsset:asset3 atTime:[mixComposition duration] error:nil];
[mixComposition insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset4.duration) ofAsset:asset4 atTime:[mixComposition duration] error:nil];
[mixComposition insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset5.duration) ofAsset:asset5 atTime:[mixComposition duration] error:nil];

然后，我使用 AVAssetExportSession 导出视频，但在每个视频之间，我会得到一个需要删除的空白/黑色帧。以前有人遇到过这个问题吗？如果有的话，你解决了吗？

此外，空白帧不在源视频文件中。

提前致谢。

我想修剪一段视频:

-(void)trimVideo:(NSURL*)outputURL
{
    //[[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:outputURL options:nil];
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality];

    NSString * outputFilePath = NSHomeDirectory();
    outputFilePath = [outputFilePath stringByAppendingPathComponent:@"Library"];
    outputFilePath = [outputFilePath stringByAppendingPathComponent:@"temp.mov"];
    NSURL * outputFileUrl = [NSURL fileURLWithPath:outputFilePath];

    exportSession.outputURL =  outputFileUrl;
    exportSession.shouldOptimizeForNetworkUse = YES;
    exportSession.outputFileType = AVFileTypeMPEG4;
    CMTime start = CMTimeMakeWithSeconds(1.0, 600);
    CMTime duration = CMTimeMakeWithSeconds(3.0, 600);
    CMTimeRange range = CMTimeRangeMake(start, duration);
    exportSession.timeRange = range;
    [exportSession exportAsynchronouslyWithCompletionHandler:^(void)
     {
         NSLog(@"Export Complete %d %@", exportSession.status, exportSession.error);
         //[exportSession release];
     }];
}

但我得到错误: …

我试图将淡入效果添加到wav文件中，然后使用导出具有添加的淡入效果的新文件AVAssetExportSession。我所看到的所有示例都将导出为m4u甚至可以使用wav或aif进行此操作吗？

我得到的错误是：

AVAssetExportSessionStatusFailed Error Domain=AVFoundationErrorDomain Code=-11822 "Cannot Open" UserInfo=0x1f01c9f0 {NSLocalizedDescription=Cannot Open, NSLocalizedFailureReason=This media format is not supported.} 

我的代码如下所示

 NSString *inpath = [path stringByAppendingFormat:@"/%@",file];

    NSString *ename = [file stringByDeletingPathExtension];
    NSString *incname = [ename stringByAppendingString:@"1t"];
    NSString *outname = [incname stringByAppendingPathExtension:@"wav"];
    NSString *outpath = [path stringByAppendingFormat:@"/%@",outname];

    NSURL *urlpath = [NSURL fileURLWithPath:inpath];
    NSURL *urlout = [NSURL fileURLWithPath:outpath];



    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES]
                                                        forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
    AVURLAsset *anAsset = [[AVURLAsset alloc] initWithURL:urlpath options:options];


    //check the soundfile is greater than 50seconds
    CMTime assetTime = [anAsset …

我正在使用 AVFoundation 裁剪和旋转视频，但在设置 AVAssetExporter 的 videoComposition 属性时收到 SIGABRT 错误。

assetExport.videoComposition = videoComposition;

有任何想法吗？

谢谢，丹尼尔。

我将两个录音(使用录音AVAudioRecorder)合并为一个文件.使用AVAssetExportSession导出的合并文件(只要我即在当前视图控制器)完美的作品第一次但当重新载入该视图(新的会话)的AVAssetExportSession exportAsynchronouslyWithCompletionHandler:方法没有得到根本称为(没有回电话! )没有错误没有什么...我试图记录AVAssetExportSession对象,我第一次得到这个

<AVAssetExportSession: 0x155b3250, asset = <AVMutableComposition: 0x156474c0 tracks = ("<AVMutableCompositionTrack: 0x156a0bb0 trackID = 1, mediaType = soun, editCount = 0>")>, presetName = AVAssetExportPresetAppleM4A, outputFileType = (null)

Run Code Online (Sandbox Code Playgroud)

这是第二次

<AVAssetExportSession: 0x1559e840, asset = <AVMutableComposition: 0x155f7f30 tracks = ("<AVMutableCompositionTrack: 0x155f0120 trackID = 1, mediaType = soun, editCount = 1>")>, presetName = AVAssetExportPresetAppleM4A, outputFileType = (null)

我注意到的唯一区别是editCount = 1.

我知道这听起来令人困惑,这对我来说.这里发生了什么？

我的代码:

AVAssetExportSession* exportSession = [AVAssetExportSession
                                       exportSessionWithAsset:composition
                                       presetName:AVAssetExportPresetAppleM4A];

NSLog(@"exportSession: %@", exportSession);


exportSession.outputURL = [NSURL fileURLWithPath:combined];
exportSession.outputFileType = …

在我的应用程序中,我允许用户以纵向模式录制视频.我在应用程序中使用它,这很好.但是,我正在实施一项功能,在Instagram上分享视频,视频必须是方形的.

将视频裁剪为正方形,比如说中心部分,是一个选项,但是由于用户在拍摄视频时没有考虑到这一点,因此通常会发现它很糟糕.

因此,我想导出视频方块,但具有宽高比和左右两个条.最好的是,有没有办法定义背景的颜色(通过代码或通过UIImage).

我能找到的最接近的是这个,但我无法充分利用它,因为我不知道如何设置转换.

示例(红色框仅用于标记图像边界):

我正在尝试导出AVMutableComposition使用AVAssetExportSession.

AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mutableComposition presetName:AVAssetExportPresetHighestQuality];
    exporter.outputURL=url;
    exporter.outputFileType = AVFileTypeQuickTimeMovie;
    exporter.videoComposition = mainCompositionInst;
    exporter.shouldOptimizeForNetworkUse = YES;

    [exporter exportAsynchronouslyWithCompletionHandler:^
     {
         switch (exporter.status)
         {
             case AVAssetExportSessionStatusCompleted:
             {
                 NSLog(@"Video Merge SuccessFullt");
             }
                 break;
             case AVAssetExportSessionStatusFailed:
                 NSLog(@"Failed:%@", exporter.error.description);
                 break;
             case AVAssetExportSessionStatusCancelled:
                 NSLog(@"Canceled:%@", exporter.error);
                 break;
             case AVAssetExportSessionStatusExporting:
                 NSLog(@"Exporting!");
                 break;
             case AVAssetExportSessionStatusWaiting:
                 NSLog(@"Waiting");
                 break;
             default:
                 break;
         }
     }];

但是出口即使是1分钟的视频也需要30秒左右,考虑到iPad内置摄像头应用程序需要不到2秒的时间.

此外,如果我videoComposition从导出器中删除,时间减少到7秒,这仍然是不好的,考虑到视频长度只有1分钟.那么,我想知道如何将出口时间减少到最低限度？

另外,我想知道,AVAssetExportSession一般需要这么多时间,还是只是我的情况？

更新:合并代码:

AVMutableComposition*mutableComposition = [AVMutableComposition composition];

AVMutableCompositionTrack *videoCompositionTrack = [mutableComposition addMutableTrackWithMediaType:AVMediaTypeVideo
                                                                                   preferredTrackID:kCMPersistentTrackID_Invalid];

AVMutableCompositionTrack *audioCompositionTrack = …

我有一个导出视频文件的代码。该代码在 iOS8 上运行良好，但在 iOS9 设备上视频文件没有声音。我认为问题出在 AVAssetExportSession 上，但我无法找到问题并修复它。同样奇怪的是，当我导出它进行播放时，该资源工作正常。

(void)export {
self.videoComposition.renderScale   = 1.0;
self.videoComposition.animationTool = [self coreAnimationTool];


FakeAsset * assetFaker = [FakeAsset new];
[assetFaker fakeAssetWithDuration:self.currentTime completitionBlock:^(AVAsset *asset) {
    [self addEmptyBackgroundTrackFromAsset:asset];
    AVAssetExportSession * exportSession    =
    [AVAssetExportSession exportSessionWithAsset:[self.composition copy]
                                      presetName:AVAssetExportPresetHighestQuality];
    [MovieExport setCurrentExporter:exportSession];


    NSUInteger i = 0;
    NSString * path;
    do {
        path  =
        [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"movieExport%i.mov",i]]; i++;
    } while ([[NSFileManager defaultManager] fileExistsAtPath:path isDirectory:NULL]);

    NSURL * url = [NSURL fileURLWithPath:path];
    if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
        [[NSFileManager defaultManager] removeItemAtURL:url error:nil];
    }
    exportSession.outputURL                 = url;
    exportSession.outputFileType …

我的视频持续时间为4:00.现在我想根据视频帧在视频文件中添加文本.比如从00:30到1:50持续时间,我想添加文字"欢迎".现在从3:00到4:00视频的持续时间我想添加文字"Awesome".如何实现这一功能.我在下面的教程中提到过.它在整个视频中添加文本而不是视频的一段时间. https://www.raywenderlich.com/30200/avfoundation-tutorial-adding-overlays-and-animations-to-videos

任何帮助都会得到满足.

我在整个视频中添加了添加文字的代码行:

- (void)applyVideoEffectsToComposition:(AVMutableVideoComposition *)composition size:(CGSize)size
{
    // 1 - Set up the text layer
    CATextLayer *subtitle1Text = [[CATextLayer alloc] init];
    [subtitle1Text setFont:@"Helvetica-Bold"];
    [subtitle1Text setFontSize:36];
    [subtitle1Text setFrame:CGRectMake(0, 0, size.width, 100)];
    [subtitle1Text setString:_subTitle1.text];
    [subtitle1Text setAlignmentMode:kCAAlignmentCenter];
    [subtitle1Text setForegroundColor:[[UIColor whiteColor] CGColor]];

    // 2 - The usual overlay
    CALayer *overlayLayer = [CALayer layer];
    [overlayLayer addSublayer:subtitle1Text];
    overlayLayer.frame = CGRectMake(0, 0, size.width, size.height);
    [overlayLayer setMasksToBounds:YES];

    CALayer *parentLayer = [CALayer layer];
    CALayer *videoLayer = [CALayer layer];
    parentLayer.frame = CGRectMake(0, 0, size.width, size.height);
    videoLayer.frame = CGRectMake(0, …