ffmpeg change resolution

	
pFrameOut = avcodec_alloc_frame();
if( pFrameOut == NULL )
{
	LOGI(1, "naInitFile::Could not Allocate an AVFrame structure");
	return ;
}
avpicture_fill((AVPicture *)pFrameOut, video_outbuf, PIX_FMT_YUV420P, video_width_out, video_height_out );
int i = 0;
int out_size = 0;
int retval = 0;
int frameFinished = 0; 
AVPacket packet;
av_init_packet( &packet );
	
while( av_read_frame( pFormatCtx, &packet ) >= 0 ) 
{
	if( packet.stream_index == NumberVideoStream ) 
	{ 			
		avcodec_decode_video2( pCodecCtx, pFrame, &frameFinished, &packet );
				 
		if(frameFinished)  // Did we get a video frame?
		{
			
			static struct SwsContext *img_convert_ctx_in = NULL;
			if (img_convert_ctx_in == NULL)
			{
				img_convert_ctx_in =sws_getContext( pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,video_width_out, video_height_out, PIX_FMT_YUV420P, SWS_BICUBIC,NULL, NULL, NULL );
					
					
				if (img_convert_ctx_in == NULL)
				{
					LOGI(10,"naInitFile::Could no create Software Scale Context");
					return ;
				}
			}
				
			retval = sws_scale(img_convert_ctx_in, pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameOut->data, pFrameOut->linesize);
				
			//SaveImage(pFrameOut->data[0], pFrameOut->linesize[0], i);
			SaveVideoFrame();
			i++;
		}//end  if(frameFinished)
				  
	}
}