iOS AVExportSession仅在修剪video时失败

我已经创建了一种方法，可以根据给定的时间范围修剪和导出video。 它还将video旋转为横向。

但是出于某种原因，AVAssetExportSession在尝试处理之前使用UIVideoEditorController修剪的video时失败。

有没有人遇到过这个问题？

我收到此错误：

AVAssetExportSessionStatusFailed: Error Domain=AVFoundationErrorDomain Code=-11841 "The operation couldn't be completed. (AVFoundationErrorDomain error -11841.)" 

对于这种方法：

  - (void) trimVideoWithRange: (CMTimeRange)range fromInputURL: (NSURL *)inputURL withCompletionHandler:(void (^)(BOOL success, NSURL *outputURL))handler; { AVAsset *asset = [AVURLAsset assetWithURL:inputURL]; AVAssetTrack *videoTrack = [asset tracksWithMediaType:AVMediaTypeVideo][0]; AVAssetTrack *audioTrack = [asset tracksWithMediaType:AVMediaTypeAudio][0]; NSLog(@"%@, %@, %@", asset, videoTrack, audioTrack); NSError *error; // Create a video composition AVMutableComposition *composition = [AVMutableComposition composition]; AVMutableCompositionTrack *videoCompositionTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; error = nil; [videoCompositionTrack insertTimeRange:videoTrack.timeRange ofTrack:videoTrack atTime:CMTimeMakeWithSeconds(0, NSEC_PER_SEC) error:&error]; NSLog(@"videoCompositionTrack timeRange: %lld, %lld", videoCompositionTrack.timeRange.start.value, videoCompositionTrack.timeRange.duration.value); if(error) NSLog(@"videoCompositionTrack error: %@", error); AVMutableCompositionTrack *audioCompositionTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; error = nil; [audioCompositionTrack insertTimeRange:audioTrack.timeRange ofTrack:audioTrack atTime:CMTimeMakeWithSeconds(0, NSEC_PER_SEC) error:&error]; NSLog(@"audioCompositionTrack timeRange: %lld, %lld", audioCompositionTrack.timeRange.start.value, audioCompositionTrack.timeRange.duration.value); if(error) NSLog(@"audioCompositionTrack error: %@", error); // Rotate video if needed CGAffineTransform rotationTransform = videoTrack.preferredTransform; // Create video composition AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition]; videoComposition.renderScale = 1.0; videoComposition.renderSize = videoTrack.naturalSize; videoComposition.frameDuration = CMTimeMake(1, 30); // Apply the transform which may have been changed AVMutableVideoCompositionLayerInstruction *instruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack]; [instruction setTransform:rotationTransform atTime:kCMTimeZero]; // Set the time range and layer instructions for the video composition AVMutableVideoCompositionInstruction *videoTrackInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; videoTrackInstruction.layerInstructions = [NSArray arrayWithObject:instruction]; videoTrackInstruction.timeRange = range; videoComposition.instructions = @[videoTrackInstruction]; // Check so that we can proceed with our desired output preset NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:composition]; if (![compatiblePresets containsObject:AVAssetExportPreset960x540]) { // Nope. if(handler) handler(NO, nil); return; } // Create export session with composition AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:composition presetName:AVAssetExportPreset960x540]; // Configure export session exportSession.outputURL = [NSURL fileURLWithPath:pathToTemporaryOutput]; exportSession.outputFileType = AVFileTypeQuickTimeMovie; exportSession.videoComposition = videoComposition; exportSession.shouldOptimizeForNetworkUse = YES; // Export async [exportSession exportAsynchronouslyWithCompletionHandler:^{ switch ([exportSession status]) { case AVAssetExportSessionStatusCompleted: { dispatch_async(dispatch_get_main_queue(), ^{ // Everything OK. Execute completion block with URL to rendered video if(handler) handler(exportSession.status == AVAssetExportSessionStatusCompleted, [NSURL fileURLWithPath:pathToTemporaryOutput]); }); } break; case AVAssetExportSessionStatusFailed: { NSError *exportError = exportSession.error; NSLog(@"AVAssetExportSessionStatusFailed: %@", exportError.description); dispatch_async(dispatch_get_main_queue(), ^{ // No go. Execute handler with fail. if(handler) handler(NO, nil); }); } break; } }]; } 

Answer 1

这对我有用。 这里exportSession是AVAssetExportSession

 NSURL *videoFileUrl = [NSURL fileURLWithPath:self.originalVideoPath]; AVAsset *anAsset = [[AVURLAsset alloc] initWithURL:videoFileUrl options:nil]; NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:anAsset]; if ([compatiblePresets containsObject:AVAssetExportPresetMediumQuality]) { self.exportSession = [[AVAssetExportSession alloc] initWithAsset:anAsset presetName:AVAssetExportPresetPassthrough]; // Implementation continues. NSURL *furl = [NSURL fileURLWithPath:self.tmpVideoPath]; self.exportSession.outputURL = furl; //provide outputFileType acording to video format extension self.exportSession.outputFileType = AVFileTypeQuickTimeMovie; CMTime start = CMTimeMakeWithSeconds(self.startTime, anAsset.duration.timescale); CMTime duration = CMTimeMakeWithSeconds(self.stopTime-self.startTime, anAsset.duration.timescale); CMTimeRange range = CMTimeRangeMake(start, duration); self.exportSession.timeRange = range; self.self.btnTrim.hidden = YES; self.myActivityIndicator.hidden = NO; [self.myActivityIndicator startAnimating]; [self.exportSession exportAsynchronouslyWithCompletionHandler:^{ switch ([self.exportSession status]) { case AVAssetExportSessionStatusFailed: NSLog(@"Export failed: %@", [[self.exportSession error] localizedDescription]); break; case AVAssetExportSessionStatusCancelled: NSLog(@"Export canceled"); break; default: NSLog(@"Triming Completed"); dispatch_async(dispatch_get_main_queue(), ^{ [self.myActivityIndicator stopAnimating]; self.myActivityIndicator.hidden = YES; }); break; } }]; }