how to get correct Video Orientation correctly in iOS after save to server

Question

I tried below code to convert video from ALAsset to NSData , this NSData is submitting to the server correctly.

Problem:

But the problem is when I get the thumbnail from NSData in the server, the image is not oriented correctly for some videos and showing correctly for other videos. Also i feel that Video also not oriented correctly.

So do I have to include any thing extra in my code. I know how to orient Image but I don't know how to orient correctly a video.

-(NSData *)ConvertVideoToNSData:(ALAsset *)asset{

NSData *VideoData;
        ALAssetRepresentation *rep = [asset defaultRepresentation];

        Byte *buffer = (Byte*)malloc(rep.size);
        NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:nil];
        VideoData = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
        return VideoData;
}

Answer 1

Try with

CGSize dimesions = [representation dimensions];
if (dimesions.height > dimesions.width)
    orientation = 1; //Portrait
else
    orientation = 0; //Lanscape