How to create a landscape video using sequence of portrait images?

I have sequence of images with portrait orientation. I am converting that images in landscape and trying to create a video but failed to generate a right video. I successfully converted images into landscape orientation but not able to right video. `CVReturn cvErr = kCVReturnSuccess; // get screenshot image! UIImage *testImage = [self createARGBImageFromRGBAImage:self.currentScreen]; NSLog(@"testImage Old :- width :- %f height :- %f",testImage.size.width,testImage.size.height); UIImage * landscapeImage = [[UIImage alloc] initWithCGImage: testImage.CGImage scale: 1.0 orientation: UIImageOrientationLeft];

    NSLog(@"landscapeImage :- width :- %f    height :- %f",landscapeImage.size.width,landscapeImage.size.height);
    CGImageRef image = (CGImageRef)[landscapeImage CGImage];
    // prepare the pixel buffer
    CVPixelBufferRef pixelBuffer = NULL;
    CFDataRef imageData= CGDataProviderCopyData(CGImageGetDataProvider(image));
    cvErr = CVPixelBufferCreateWithBytes(kCFAllocatorDefault,
                                         landscapeImage.size.width,
                                         landscapeImage.size.height,
                                         kCVPixelFormatType_32ARGB,
                                         (void*)CFDataGetBytePtr(imageData),
                                         CGImageGetBytesPerRow(image),
                                         NULL,
                                         NULL,
                                         NULL,
                                         &pixelBuffer);
    // calculate the time
    CFAbsoluteTime thisFrameWallClockTime = CFAbsoluteTimeGetCurrent();
    CFTimeInterval elapsedTime = thisFrameWallClockTime - firstFrameWallClockTime;
    //NSLog (@”elapsedTime: %f”, elapsedTime);
    CMTime presentationTime =  CMTimeMake (elapsedTime * TIME_SCALE, TIME_SCALE);

    // write the sample
    BOOL appended = [avAdaptor appendPixelBuffer:pixelBuffer withPresentationTime:presentationTime];

`