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°
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-(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;
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