ios – 使用AVMutableComposition合并视频时视频破解

概述我正在使用AVMutableComposition将视频与下面的代码合并, - (void)MergeAndSave_internal{ AVMutableComposition *composition = [AVMutableComposition composition]; AVMutableCompositionTrack *compositionVideoTrack = 我正在使用AVMutableComposition将视频与下面的代码合并,

- (voID)MergeAndSave_internal{    AVMutableComposition *composition = [AVMutableComposition composition];    AVMutableCompositionTrack *compositionVIDeoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVIDeo preferredTrackID:kCMPersistentTrackID_InvalID];    AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_InvalID];    AVMutableVIDeoComposition *vIDeoComposition = [AVMutableVIDeoComposition vIDeoComposition];    vIDeoComposition.frameDuration = CMTimeMake(1,30);    vIDeoComposition.renderScale = 1.0;    AVMutableVIDeoCompositionInstruction *instruction = [AVMutableVIDeoCompositionInstruction vIDeoCompositionInstruction];    AVMutableVIDeoCompositionLayerInstruction *layerInstruction = [AVMutableVIDeoCompositionLayerInstruction vIDeoCompositionLayerInstructionWithAssetTrack:compositionVIDeoTrack];    NSLog(@"%@",vIDeoPathArray);    float time = 0;    CMTime startTime = kCMTimeZero;    for (int i = 0; i<vIDeoPathArray.count; i++) {        AVURLAsset *sourceAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:[vIDeoPathArray objectAtIndex:i]] options:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:AVURLAssetPreferPreciseDurationAndTimingKey]];        NSError *error = nil;        BOol ok = NO;        AVAssetTrack *sourceVIDeoTrack = [[sourceAsset tracksWithMediaType:AVMediaTypeVIDeo] objectAtIndex:0];        AVAssetTrack *sourceAudioTrack = [[sourceAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];        CGSize temp = CGSizeApplyAffinetransform(sourceVIDeoTrack.naturalSize,sourceVIDeoTrack.preferredtransform);        CGSize size = CGSizeMake(fabsf(temp.wIDth),fabsf(temp.height));        CGAffinetransform transform = sourceVIDeoTrack.preferredtransform;        vIDeoComposition.renderSize = sourceVIDeoTrack.naturalSize;        if (size.wIDth > size.height) {            [layerInstruction settransform:transform atTime:CMTimeMakeWithSeconds(time,30)];        } else {            float s = size.wIDth/size.height;            CGAffinetransform newe = CGAffinetransformConcat(transform,CGAffinetransformMakeScale(s,s));            float x = (size.height - size.wIDth*s)/2;            CGAffinetransform newer = CGAffinetransformConcat(newe,CGAffinetransformMakeTranslation(x,0));            [layerInstruction settransform:newer atTime:CMTimeMakeWithSeconds(time,30)];        }        if(i==0){             [compositionVIDeoTrack setPreferredtransform:sourceVIDeoTrack.preferredtransform];        }        ok = [compositionVIDeoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,[sourceAsset duration]) ofTrack:sourceVIDeoTrack atTime:startTime error:&error];        ok = [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,[sourceAsset duration]) ofTrack:sourceAudioTrack atTime:startTime error:nil];        if (!ok) {            {                [radialVIEw4 setHIDden:YES];                NSLog(@"Export Failed: %@",[[self.exportSession error] localizedDescription]);                UIAlertVIEw *alert = [[UIAlertVIEw alloc] initWithTitle:@"Error" message:@"Something Went Wrong :("  delegate:nil cancelbuttonTitle:@"Ok" otherbuttonTitles: nil,nil];                [alert show];                [radialVIEw4 setHIDden:YES];                break;            }        }        startTime = CMTimeAdd(startTime,[sourceAsset duration]);    }    instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];    instruction.timeRange = compositionVIDeoTrack.timeRange;    vIDeoComposition.instructions = [NSArray arrayWithObject:instruction];    NSArray *paths = NSSearchPathForDirectorIEsInDomains(NS@R_403_4617@Directory,NSUserDomainMask,YES);    Nsstring *@R_403_4617@sDirectory = [paths objectAtIndex:0];    Nsstring *myPathDocs =  [@R_403_4617@sDirectory stringByAppendingPathComponent:                             [Nsstring stringWithFormat:@"RampMergedVIDeo.mov"]];    unlink([myPathDocs UTF8String]);    NSURL *url = [NSURL fileURLWithPath:myPathDocs];    AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:composition                                                                      presetname:AVAssetExportPreset1280x720];    exporter.outputURL=url;    exporter.outputfileType = AVfileTypeQuickTimeMovIE;    exporter.shouldOptimizeforNetworkUse = YES;    [exporter exportAsynchronouslyWithCompletionHandler:^{        dispatch_async(dispatch_get_main_queue(),^{            switch ([exporter status]) {                case AVAssetExportSessionStatusFailed:                    NSLog(@"Export Failed: %@",[exporter error]);                    break;                case AVAssetExportSessionStatusCancelled:                    NSLog(@"Export canceled");                    break;                case AVAssetExportSessionStatusCompleted:{                    NSLog(@"Export successfully");                }                default:                    break;            }            if (exporter.status != AVAssetExportSessionStatusCompleted){                NSLog(@"Retry export");            }        });    }];}

但视频在保存到系统并在快速播放器中播放时看起来很破旧.我认为CFAffline中的问题转化了.有人可以请教吗？

这是视频中间的破解屏幕：

解决方法 您尚未将vIDeoComposition设置为AVAssetExportSession.尝试做这个exporter.vIDeoComposition = vIDeoComposition;.虽然尝试了这个但是应该工作. 总结

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