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copied!<p>In case anyone else is looking for this answer as well, this is the method that I cooked up (modified a bit to simplify):</p> <pre><code>- (void)encodeVideoOrientation:(NSURL *)anOutputFileURL { CGAffineTransform rotationTransform; CGAffineTransform rotateTranslate; CGSize renderSize; switch (self.recordingOrientation) { // set these 3 values based on orientation } AVURLAsset * videoAsset = [[AVURLAsset alloc]initWithURL:anOutputFileURL options:nil]; AVAssetTrack *sourceVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; AVAssetTrack *sourceAudioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; AVMutableComposition* composition = [AVMutableComposition composition]; AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:sourceVideoTrack atTime:kCMTimeZero error:nil]; [compositionVideoTrack setPreferredTransform:sourceVideoTrack.preferredTransform]; AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:sourceAudioTrack atTime:kCMTimeZero error:nil]; AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:compositionVideoTrack]; [layerInstruction setTransform:rotateTranslate atTime:kCMTimeZero]; AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition]; videoComposition.frameDuration = CMTimeMake(1,30); videoComposition.renderScale = 1.0; videoComposition.renderSize = renderSize; instruction.layerInstructions = [NSArray arrayWithObject: layerInstruction]; instruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration); videoComposition.instructions = [NSArray arrayWithObject: instruction]; AVAssetExportSession * assetExport = [[AVAssetExportSession alloc] initWithAsset:composition presetName:AVAssetExportPresetMediumQuality]; NSString* videoName = @"export.mov"; NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName]; NSURL * exportUrl = [NSURL fileURLWithPath:exportPath]; if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath]) { [[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil]; } assetExport.outputFileType = AVFileTypeMPEG4; assetExport.outputURL = exportUrl; assetExport.shouldOptimizeForNetworkUse = YES; assetExport.videoComposition = videoComposition; [assetExport exportAsynchronouslyWithCompletionHandler: ^(void ) { switch (assetExport.status) { case AVAssetExportSessionStatusCompleted: // export complete NSLog(@"Export Complete"); break; case AVAssetExportSessionStatusFailed: NSLog(@"Export Failed"); NSLog(@"ExportSessionError: %@", [assetExport.error localizedDescription]); // export error (see exportSession.error) break; case AVAssetExportSessionStatusCancelled: NSLog(@"Export Failed"); NSLog(@"ExportSessionError: %@", [assetExport.error localizedDescription]); // export cancelled break; } }]; } </code></pre> <p>This stuff is poorly documented, unfortunately, but by stringing examples together from other SO questions and reading the header files, I was able to get this working. Hope this helps anyone else!</p>

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