相关疑难解决方法(0)

我的应用程序做了一些处理,在某些时候它需要调用AVAssetExportSession.

如果会话已经开始,然后我对应用程序进行后台处理,一切都正常完成.不过,如果我的背景之前调用应用程序exportAsynchronouslyWithCompletionHandler.我收到此错误:

AVAssetExportSessionStatusFailed Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x1e550db0 {NSLocalizedFailureReason=An unknown error occurred (-12985), NSUnderlyingError=0x1e574910 "The operation couldn’t be completed. (OSStatus error -12985.)", NSLocalizedDescription=The operation could not be completed}

是否可以在后台启动AVAssetExportSession？

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: …

我正在开发一个录制视频的应用程序.录制结束后,我使用图书馆将GIF图像放在上面 .

我的代码用于播放视频和将gif图像作为叠加层

    self.avPlayer = [AVPlayer playerWithURL:self.urlstring];
    self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;

    AVPlayerLayer *videoLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
    videoLayer.frame = self.preview_view.bounds;
    videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

    [self.preview_view.layer addSublayer:videoLayer];


    NSURL *url = [[NSBundle mainBundle] URLForResource:@"02" withExtension:@"gif"];
    self.img_gif.image = [UIImage animatedImageWithAnimatedGIFData:[NSData dataWithContentsOfURL:url]];

但现在我想合并并保存带有此GIF图像叠加的视频.我谷歌它没找到我想要的东西.

谢谢您的帮助