我将视频与其他视频合并后将其上传到服务器，但录制的视频顺时针旋转

Posted 2023-02-25

【中文标题】我将视频与其他视频合并后将其上传到服务器，但录制的视频顺时针旋转

【英文标题】：I am uploading video to server after merging it with other video but the recorded video is rotated clockwise

【发布时间】：2017-02-28 09:33:00

【问题描述】：

合并代码-

AVAsset *firstAsset=[AVAsset assetWithURL:urlIntroVideo];资产 *secondAsset=[AVAssetassetWithURL:recordedVideoUrl];

if (firstAsset !=nil && secondAsset!=nil) //[[AppDelegate Getdelegate] showIndicator]; // 1 - 创建 AVMutableComposition 对象。该对象将保存您的 AVMutableCompositionTrack 实例。 AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init]; // 2 - 视频轨道

/********************************************************************************

 --------------->>      VIDEO MERGING TRACK              <<--------------------

 ********************************************************************************/



AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
                                                                    preferredTrackID:kCMPersistentTrackID_Invalid];

NSArray *videoTracks = [NSArray arrayWithArray: [firstAsset tracksWithMediaType:AVMediaTypeVideo]];
NSLog(@"Video Tracks count  1st Assest=> %ld",[videoTracks count]);


NSArray *audioTracks = [NSArray arrayWithArray: [firstAsset tracksWithMediaType:AVMediaTypeAudio]];
NSLog(@"Auido Tracks count => %ld",[audioTracks count]);



[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration)
                    ofTrack:[[firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]

atTime:kCMTimeZero 错误:nil];

[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, secondAsset.duration)
                    ofTrack:[[secondAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]

atTime:firstAsset.duration error:nil];

NSString *bundleDirectory = [[NSBundle mainBundle] bundlePath];

NSString *potrait_intro = [bundleDirectory stringByAppendingPathComponent:@"silent08s.mp3"];

NSURL    *potrait_intro_url = [NSURL fileURLWithPath:potrait_intro];


AVAsset *audioAssest=[AVAsset assetWithURL:potrait_intro_url];


AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio

preferredTrackID:kCMPersistentTrackID_Invalid];

NSArray *audioTracksSilent = [NSArray arrayWithArray: [audioAssest tracksWithMediaType:AVMediaTypeAudio]];


[audioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAssest.duration)
                    ofTrack:([audioTracksSilent count]>0)?[audioTracksSilent objectAtIndex:0]:nil
                     atTime:kCMTimeZero
                      error:nil];



NSArray *audioTracks2 = [NSArray arrayWithArray: [secondAsset tracksWithMediaType:AVMediaTypeAudio]];
NSLog(@"Auido Tracks count => %ld",[audioTracks2 count]);

[audioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, secondAsset.duration)
                    ofTrack:[[secondAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]
                     atTime:audioAssest.duration
                      error:nil];

//



//  NSFileManager *fileMgr = [NSFileManager defaultManager];
NSString *documentsDirectory = [NSHomeDirectory()
                                stringByAppendingPathComponent:@"Documents"];
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:[NSString

stringWithFormat:@"final_merged_video-%d.mov",arc4random() % 1000]];

NSURL *url = [NSURL fileURLWithPath:myPathDocs];
// 5 - Create exporter
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition
                                                                  presetName:AVAssetExportPresetHighestQuality];
exporter.outputURL=url;
exporter.outputFileType = AVFileTypeQuickTimeMovie;
exporter.shouldOptimizeForNetworkUse = YES;
[exporter exportAsynchronouslyWithCompletionHandler:^
    dispatch_async(dispatch_get_main_queue(), ^

        [[AppDelegate Getdelegate] hideIndicator];

        [self exportDidFinish:exporter];
    );
]; 

请帮我解决这个问题

【参考方案1】：

当您合并两个视频和/或您的服务器无法处理它时，您可能会丢失 AVAsset 上的轮播信息。 您需要做的是获取旋转信息（例如：https://gist.github.com/lukabernardi/5020724），然后在将视频发送到服务器之前相应地旋转视频。

【讨论】：

感谢您的回答，它帮助我获得了方向，但现在如何将该 AVasset 旋转 90 度？

您可以按照这个答案来帮助解决您的问题：***.com/questions/12136841/…

它没有醒来！！合并两个视频后，录制的一个旋转 90 度，另一个的方向很好

您需要更具体地了解您的问题

我在 potrait 模式下合并两个视频。第一个视频是 potrait 视频中的普通 mp4 视频，另一个是我在 potrait 中从我的相机录制的视频。现在当我合并两者时视频第一个视频方向很好，但第二个视频旋转了 90 度