AV_PIX_FMT_YUVJ422P以JPEG转换

我能够像从AV_PIX_FMT_YUVJ422P转换为JPEG格式（下面的代码），但具有完整的上下半区绿荫PLZ建议我在哪里做错了所得到的图像。以下步骤i已经采取AV_PIX_FMT_YUVJ422P以JPEG转换

最初我有AV_PIX_FMT_UYVY422图像从相机，我有其转换在AV_PIX_FMT_YUVJ422P格式和能够看到http://rawpixels.net/通过网站所示的参数此图像尺寸2448X2050，BPP1 = 8，BPP2 = 8和Bpp3 = 8，对准1，子采样H = 2，以及子采样V = 1，格式：YUV422P 所以输入图像是正确AV_PIX_FMT_YUVJ422P格式。 &还能够看到“YUV图像浏览软件”使用YUV422格式。

现在我尝试使用下面的代码，将其转换为JPEG格式和连接是具有完整的上下半区绿荫所得到的图像。

在这里输入的代码

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主（INT的argc，字符* argv的[]） {

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

来源

2017-07-27 user3743908

改变从AV_PIX_FMT_YUVJ422P输入像素格式到AV_PIX_FMT_YUVJ P解决问题。

来源

2017-07-28 03:26:54 user3743908

AV_PIX_FMT_YUVJ422P以JPEG转换

回答

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