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POVideo recorded from EAGLView is flipped when uploaded to youtube
 

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    <p>In my ios app, I am trying to record video of the content of EAGLView(There is no Camera involvement). I have no problem recording the video. After recording I have to add few sound tracks to the video and then have to share this video to Youtube and facebook. My problem is that the video is okay when I play it on iphone or on mac but when I upload this video to youtube (using Youtube Data Api v3), the video is vertically inverted or upside down.</p> <p>I guess I need to rotate the frame in video before uploading but I don't know how to do that.</p> <p>Any help will be highly appreciated.</p> <p>The code I am using to add audio tracks to the video is below:</p> <pre><code>-(void)prepareVideoForPath:(NSString *)videoPath usingAudio:(NSArray *)audioArray andOutputPath:(NSString *)exportPath{ NSDictionary *optionsDictionary = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:AVURLAssetPreferPreciseDurationAndTimingKey]; NSURL *videoUrl=[NSURL fileURLWithPath:videoPath]; AVURLAsset* videoAsset = [AVURLAsset URLAssetWithURL:videoUrl options:optionsDictionary]; AVAssetTrack *FirstAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; CGAffineTransform firstTransform = FirstAssetTrack.preferredTransform; AVMutableComposition* mixComposition = [AVMutableComposition composition]; //VideoTrack AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:FirstAssetTrack atTime:kCMTimeZero error:nil]; [compositionVideoTrack setPreferredTransform:firstTransform]; //Audio Track AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; CMTime audioStartTime = kCMTimeZero; for (NSURL *audioURL in audioArray) { AVURLAsset *audioAsset = [AVURLAsset URLAssetWithURL:audioURL options:optionsDictionary]; [audioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset.duration) ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:audioStartTime error:nil]; audioStartTime = CMTimeAdd(audioStartTime, audioAsset.duration); } AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetPassthrough]; NSURL *exportUrl = [NSURL fileURLWithPath:exportPath]; _assetExport.outputFileType = AVFileTypeQuickTimeMovie; NSLog(@"file type %@",_assetExport.outputFileType); _assetExport.outputURL = exportUrl; _assetExport.shouldOptimizeForNetworkUse = YES; [_assetExport exportAsynchronouslyWithCompletionHandler: ^(void ) { // your completion code here dispatch_async(dispatch_get_main_queue(), ^{ NSLog(@"Mixing complete"); }); } ]; </code></pre> <p>}</p>
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    1. USGaurav Singh
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    1. COI want to know how do you record video of the content that is displayed in GLKView. By searching forums, I know if I can get a series of images, I can render them into an video. Do you get images first and render them into an video? If so, how do you get the images? Do you capture the screen periodically or in some other ways? Can you give me any clues? Thank you!
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      1. USecho
    2. COYou can create video by creating a series of images using glReadPixels() but it is very expensive to use. Another methods is using Frame Buffer objects(FBO) which is very fast and efficient. I succeeded in creating video using FBOs but messed the content display on the screen i.e. nothing get displayed on the screen, every thing was going to video. I am not much comfortable in openGLES. I am currently using [**Everyplay SDK**](https://developers.everyplay.com/) to record video of my GLKView.
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      1. USGaurav Singh
    3. COThanks for your reply. I will try Everyplay SDK.
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