iOS 播放本地视频不能全屏 旋转90°

从本地相册播放视频时，不能全屏显示 上下有黑边 并且视频旋转了90°

WechatIMG1803.jpeg

-(void)theTranerVideoWithVideoURL:(NSURL *)videoURL
{
    //视频来源路径
    NSURL   *video_inputFileUrl = videoURL;
  
    //最终合成输出路径
 NSString *documentsDirectory =[NSHomeDirectory()
                                   stringByAppendingPathComponent:@"Documents"];
    NSString *outputFilePath =[documentsDirectory stringByAppendingPathComponent:@"finalchange_video2222.mp4"];
    NSURL   *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
    
    if([[NSFileManager defaultManager]fileExistsAtPath:outputFilePath])
        [[NSFileManager defaultManager]removeItemAtPath:outputFilePath error:nil];
    
    CMTime nextClipStartTime =kCMTimeZero;
    
    //创建可变的音频视频组合
    AVMutableComposition* mixComposition =[AVMutableComposition composition];
    
     //视频采集
    AVURLAsset* videoAsset =[[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];
    CMTimeRange video_timeRange =CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
//    AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
//    [a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0]atTime:nextClipStartTime error:nil];
    
    // 视频轨道
    AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
    // 插入视频轨道
    [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, CMTimeMake(videoAsset.duration.value, videoAsset.duration.timescale)) ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] firstObject] atTime:kCMTimeZero error:nil];

    // 音频轨道
    AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
    // 插入音频轨道
    [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, CMTimeMake(videoAsset.duration.value, videoAsset.duration.timescale)) ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeAudio] firstObject] atTime:kCMTimeZero error:nil];
  
    //创建一个输出
    AVAssetExportSession* _assetExport =[[AVAssetExportSession alloc]initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];
    _assetExport.outputFileType =AVFileTypeQuickTimeMovie;
    _assetExport.outputURL =outputFileUrl;
    _assetExport.shouldOptimizeForNetworkUse=YES;
    _assetExport.videoComposition = [self getVideoComposition:videoAsset];
    self.endVideoPath=outputFileUrl;
    __weak typeof(self)weakSelf = self;
    [_assetExport exportAsynchronouslyWithCompletionHandler:
     ^(void ) {
    NSLog(@"完成！输出路径==%@",outputFilePath);
//         [weakSelf pushResult:outputFileUrl WithCoverImage:nil];
     }
     ];
}

//调整视频方向 关键代码

- (AVMutableVideoComposition *)getVideoComposition:(AVAsset *)asset {
    AVAssetTrack *videoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
    AVMutableComposition *composition = [AVMutableComposition composition];
    AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition];
    CGSize videoSize = videoTrack.naturalSize;
    
    NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeVideo];
    if([tracks count] > 0) {
        AVAssetTrack *videoTrack = [tracks objectAtIndex:0];
        CGAffineTransform t = videoTrack.preferredTransform;
        if((t.a == 0 && t.b == 1.0 && t.c == -1.0 && t.d == 0) ||
           (t.a == 0 && t.b == -1.0 && t.c == 1.0 && t.d == 0)){
            videoSize = CGSizeMake(videoSize.height, videoSize.width);
        }
    }
    composition.naturalSize    = videoSize;
    videoComposition.renderSize = videoSize;
    videoComposition.frameDuration = CMTimeMakeWithSeconds( 1 / videoTrack.nominalFrameRate, 600);
    
    AVMutableCompositionTrack *compositionVideoTrack;
    compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
    [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration) ofTrack:videoTrack atTime:kCMTimeZero error:nil];
    AVMutableVideoCompositionLayerInstruction *layerInst;
    layerInst = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
    [layerInst setTransform:videoTrack.preferredTransform atTime:kCMTimeZero];
    AVMutableVideoCompositionInstruction *inst = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
    inst.timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration);
    inst.layerInstructions = [NSArray arrayWithObject:layerInst];
    videoComposition.instructions = [NSArray arrayWithObject:inst];
    return videoComposition;
}

ps:以下代码未验证

 // 获取视频
    AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:_fileURL options:nil];
                              
    // 视频混合
    AVMutableComposition* mixComposition = [AVMutableComposition composition];
   // 视频轨道
   AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
    // 音频轨道
  AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
  // 视频的方向
 CGAffineTransform videoTransform = [videoAsset tracksWithMediaType:AVMediaTypeVideo].lastObject.preferredTransform;
if (videoTransform.a == 0 && videoTransform.b == 1.0 && videoTransform.c == -1.0 && videoTransform.d == 0) {
    NSLog(@"垂直拍摄");
    videoTransform = CGAffineTransformMakeRotation(M_PI_2);
    
 }else if (videoTransform.a == 0 && videoTransform.b == -1.0 && videoTransform.c == 1.0 && videoTransform.d == 0) {
    NSLog(@"倒立拍摄"); videoTransform = CGAffineTransformMakeRotation(-M_PI_2);
    
}else if (videoTransform.a == 1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == 1.0) {
     NSLog(@"Home键右侧水平拍摄");
     videoTransform = CGAffineTransformMakeRotation(0);
    
}else if (videoTransform.a == -1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == -1.0) {
        NSLog(@"Home键左侧水平拍摄");
        videoTransform = CGAffineTransformMakeRotation(M_PI);
        
}
   // 根据视频的方向同步视频轨道方向
   compositionVideoTrack.preferredTransform = videoTransform;