image becomes vertical lines after RGB -> YUV420 back to -> RGB conversion

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Hi
I have a RGB24 image which I am saved on file, I am using sws_scale to convert it to YUV420 and then I wanted to verify if the conversion was done correctly so I tried converting it back to RGB24 to view the results. And all I see is vertical white and black bars. What am I doint incorrect?

Any help would be greatly appreciated!

I have attached the code here

if (sws_ctx == NULL)
{
   sws_ctx = sws_getContext(pFrameRGB->width, pFrameRGB->height,
			    AV_PIX_FMT_RGB24, pFrameRGB->width, pFrameRGB->height,
			    AV_PIX_FMT_YUV420P, SWS_FAST_BILINEAR, 0, 0, 0);
}
	
int inLinesize[1] = { 3*pFrameRGB->width }; // RGB stride
sws_scale(sws_ctx, pFrameRGB->data, inLinesize, 0, pFrameRGB->height, frame2->data, frame2->linesize);
        

if ( final_sws_ctx == NULL )
{
   final_sws_ctx = sws_getContext(pFrameRGB->width, pFrameRGB->height,
   AV_PIX_FMT_YUV420P, pFrameRGB->width, pFrameRGB->height,
   AV_PIX_FMT_RGB24, SWS_FAST_BILINEAR, 0, 0, 0);
}

sws_scale(sws_ctx, frame2->data, frame2->linesize, 0, frame2->height, finalRGB->data, finalRGB->linesize);