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    <p>Use these below <code>method</code> to set <code>correct</code> <code>orientation</code> according to <code>video</code> <code>asset</code> <code>orientation</code> in <code>AVMutableVideoComposition</code></p> <pre><code>-(AVMutableVideoComposition *) getVideoComposition:(AVAsset *)asset { AVAssetTrack *videoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; AVMutableComposition *composition = [AVMutableComposition composition]; AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition]; CGSize videoSize = videoTrack.naturalSize; BOOL isPortrait_ = [self isVideoPortrait:asset]; if(isPortrait_) { NSLog(@"video is portrait "); videoSize = CGSizeMake(videoSize.height, videoSize.width); } composition.naturalSize = videoSize; videoComposition.renderSize = videoSize; // videoComposition.renderSize = videoTrack.naturalSize; // 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; } -(BOOL) isVideoPortrait:(AVAsset *)asset { BOOL isPortrait = FALSE; NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeVideo]; if([tracks count] &gt; 0) { AVAssetTrack *videoTrack = [tracks objectAtIndex:0]; CGAffineTransform t = videoTrack.preferredTransform; // Portrait if(t.a == 0 &amp;&amp; t.b == 1.0 &amp;&amp; t.c == -1.0 &amp;&amp; t.d == 0) { isPortrait = YES; } // PortraitUpsideDown if(t.a == 0 &amp;&amp; t.b == -1.0 &amp;&amp; t.c == 1.0 &amp;&amp; t.d == 0) { isPortrait = YES; } // LandscapeRight if(t.a == 1.0 &amp;&amp; t.b == 0 &amp;&amp; t.c == 0 &amp;&amp; t.d == 1.0) { isPortrait = FALSE; } // LandscapeLeft if(t.a == -1.0 &amp;&amp; t.b == 0 &amp;&amp; t.c == 0 &amp;&amp; t.d == -1.0) { isPortrait = FALSE; } } return isPortrait; } </code></pre>
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    1. POiOS AVFoundation: Setting Orientation of Video
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    1. USParesh Navadiya
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      1. VTUpMod
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