AV_PIX_FMT_YUVJ422P to jpeg conversion - ffmpeg

Question

i am able to convert image from AV_PIX_FMT_YUVJ422P to jpeg format (below Code) but the resultant image having green shade on complete bottom half plz suggest where i am doing wrong.
Following step i have taken
Initially i have AV_PIX_FMT_UYVY422 image from camera, i have convert it in AV_PIX_FMT_YUVJ422P format and able to see this image on http://rawpixels.net/ the parameters shown by website is size 2448X2050, Bpp1= 8,Bpp2 = 8 and Bpp3 = 8,alignment 1, SubSampling H =2, and SubSampling V = 1, format: YUV422P
so input image is Correct AV_PIX_FMT_YUVJ422P format. & also able to see on "YUV image viewer Software" using YUV422 format.
Now i am trying to convert it in jpeg format using below Code and attached is the resultant Image having green shade on complete bottom half.
AVFormatContext* pFormatCtx;
AVOutputFormat* fmt;
AVStream* video_st;
AVCodecContext* pCodecCtx;
AVCodec* pCodec;
uint8_t* picture_buf;
AVFrame* picture;
AVPacket pkt;
int y_size;
int size;
int got_picture=0;
int ret=0;
int main( int argc, char* argv[] )
{
FILE *in_file = NULL;
unsigned int in_width = 2448;
unsigned int in_height = 2050;
const char* out_file = "encoded_pic.jpg";
in_file = fopen("c:\\test_Planar.yuv","rb");
if(in_file == NULL) { printf("\n\tFile Opening error...!!"); exit(1); }
else printf("\n\tYUV File Open Sucessfully...!!\n\n");
av_register_all(); // Loads the whole database of available codecs and formats.
pFormatCtx = avformat_alloc_context();
fmt = NULL;
fmt = av_guess_format("mjpeg",NULL,NULL);
pFormatCtx->oformat = fmt;
//------Output URL-------------------------
if (avio_open(&pFormatCtx->pb,out_file, AVIO_FLAG_READ_WRITE) < 0)
{
printf("Couldn't open output file.");
return -1;
}
video_st = avformat_new_stream(pFormatCtx, 0);
if (video_st==NULL) return -1;
pCodecCtx = video_st->codec;
pCodecCtx->codec_id = fmt->video_codec;
pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
pCodecCtx->pix_fmt = AV_PIX_FMT_YUVJ422P;
//--------------------------MY SOURCE PIXEL FORMAT--------------
pCodecCtx->width = in_width;
pCodecCtx->height = in_height;
pCodecCtx->time_base.num = 1;
pCodecCtx->time_base.den = 1;//25;
//Output some information
av_dump_format(pFormatCtx, 0, out_file, 1);
// Determine if desired video encoder is installed
pCodec = avcodec_find_encoder(pCodecCtx->codec_id);
if (!pCodec)
{
printf("Codec not found.");
return -1;
}
printf("\nCodec Identified done\n");
if (avcodec_open2(pCodecCtx, pCodec,NULL) < 0){
printf("Could not open codec.\n");
return -1;
}
picture = av_frame_alloc();
size = avpicture_get_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
picture_buf = (uint8_t *)av_malloc(size);
if (!picture_buf) return -1;
avpicture_fill((AVPicture *)picture, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
printf("\t\nWrite Header..");
avformat_write_header(pFormatCtx,NULL);
y_size = pCodecCtx->width * pCodecCtx->height;
av_new_packet(&pkt,y_size*3);
//Read YUV
if (fread(picture_buf, 1, y_size*3/2, in_file) <=0)
{
printf("Could not read input file.");
return -1;
}
//--------------------------------------------input image format UYVY
picture->data[0] = picture_buf; // Y
picture->data[1] = picture_buf+ y_size; // U
picture->data[2] = picture_buf+ y_size*5/4; // V
//-----------------------------------------------
printf("\t\n Encode the image..\n");
ret = avcodec_encode_video2(pCodecCtx, &pkt,picture, &got_picture);
if(ret < 0)
{
printf("Encode Error.\n");
return -1;
}
if (got_picture==1)
{
pkt.stream_index = video_st->index;
ret = av_write_frame(pFormatCtx, &pkt);
}
av_free_packet(&pkt);
//Write Trailer
av_write_trailer(pFormatCtx);
printf("Encode Successful.\n");
if (video_st)
{
avcodec_close(video_st->codec);
av_free(picture);
av_free(picture_buf);
}
avio_close(pFormatCtx->pb);
avformat_free_context(pFormatCtx);
fclose(in_file);
printf("\n\tYUV File Close Sucessfully...!!");
}
Resultant output jpeg encoded image from yuvj422p image having green shade

Answer 1

Changing the input Pixel format from AV_PIX_FMT_YUVJ422P to AV_PIX_FMT_YUVJ420P resolve the issue.