How to fix video orientation issue in iOS

Question

I am working with an app in which user picks video from Photos and uploads it to server. As my server is .Net server , the video gets rotated. I know the reason of problem i

Answer 1

AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:@"your video url here..." options:nil];

Add After AVMutableCompositionTrack.

set setPreferredTransform: set here your source video that you want to export with same orientation.

 // Grab the source track from AVURLAsset for example.
AVAssetTrack *assetVideoTrack = [videoAsset tracksWithMediaType:AVMediaTypeVideo].lastObject;

// Grab the composition video track from AVMutableComposition you already made.
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition tracksWithMediaType:AVMediaTypeVideo].lastObject;

// Apply the original transform.
if (assetVideoTrack && compositionVideoTrack) {
        [compositionVideoTrack setPreferredTransform:assetVideoTrack.preferredTransform];
    }