[转]ffmpeg在vs2008中的使用

最终采用了https://blog.csdn.net/smilestone_322/article/details/7605101的方案

转自：http://blog.sina.com.cn/s/blog_62949ff40101egbw.html

1.到http://ffmpeg.zeranoe.com/builds/
下载ffmpeg-20131120-git-e502783-win32-dev和ffmpeg-20131120-git-e502783-win32-shared

2.打开vs2008建立控制台程序，将ffmpeg-20131120-git-e502783-win32-dev下的include和lib拷贝到程序目录下，设置和头文件和库的依赖目录

3.编译过程：
错误一：无法打开包括文件:“inttypes.h”: No such file or directory
解决方法：删除之，并在其之前添加如下代码：
#if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
#     define CONFIG_WIN32
#endif
#if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(EMULATE_INTTYPES)
#     define EMULATE_INTTYPES
#endif
#ifndef EMULATE_INTTYPES
#    include
#else
      typedef signed char   int8_t;
      typedef signed short int16_t;
      typedef signed int    int32_t;
      typedef unsigned char   uint8_t;
      typedef unsigned short uint16_t;
      typedef unsigned int    uint32_t;
#    ifdef CONFIG_WIN32
          typedef signed __int64    int64_t;
          typedef unsigned __int64 uint64_t;
#    else
          typedef signed long long    int64_t;
          typedef unsigned long long uint64_t;
#    endif
#endif

错误二： error C3861: “UINT64_C”: 找不到标识符
解决方法：在common.h中添加如下代码：

#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif

错误三：
注释掉
//#if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)
//#error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS

//#endif

4.示例代码：从一个视频文件中，拆出五张图片

#include
#include

#ifdef __cplusplus
extern "C" {
#endif
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#ifdef __cplusplus
}
#endif

void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) {
  FILE *pFile;
  char szFilename[32];
  int  y;

  // Open file
  sprintf(szFilename, "frame%d.ppm", iFrame);
  pFile=fopen(szFilename, "wb");
  if(pFile==NULL)
   return;

  // Write header
  fprintf(pFile, "P6\n%d %d\n255\n", width, height);

  // Write pixel data
  for(y=0; y
   fwrite(pFrame->data[0]+y*pFrame->linesize[0], 1, width*3, pFile);

  // Close file
  fclose(pFile);
}

int main() {
  AVFormatContext *pFormatCtx;
int            i, videoStream;
  AVCodecContext *pCodecCtx;
AVCodec        *pCodec;
AVFrame        *pFrame;
AVFrame        *pFrameRGB;
AVPacket       packet;
int            frameFinished;
int            numBytes;
uint8_t        *buffer;
  static struct SwsContext *img_convert_ctx;
  char * filePath="test.mp4";
  // Register all formats and codecs
  av_register_all();
  // Open video file
  if(avformat_open_input(&pFormatCtx, filePath, NULL, NULL)!=0)

     return -1; // Couldn't open file

  // Retrieve stream information
  if(av_find_stream_info(pFormatCtx)<0)
    return -1; // Couldn't find stream information

  // Dump information about file onto standard error
  av_dump_format(pFormatCtx, 0, filePath, 0);
    // Find the first video stream
  videoStream=-1;
  for(i=0; inb_streams; i++)
   if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
     videoStream=i;
     break;
    }
  if(videoStream==-1)
    return -1; // Didn't find a video stream
   // Get a pointer to the codec context for the video stream
pCodecCtx=pFormatCtx->streams[videoStream]->codec;

    // Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  if(pCodec==NULL) {
   fprintf(stderr, "Unsupported codec!\n");
    return -1; // Codec not found
  }
   // Open codec
  if(avcodec_open2(pCodecCtx, pCodec)<0)
    return -1; // Could not open codec

    // Allocate video frame
  pFrame=avcodec_alloc_frame();

  // Allocate an AVFrame structure
  pFrameRGB=avcodec_alloc_frame();
  if(pFrameRGB==NULL)
    return -1;

  // Determine required buffer size and allocate buffer
  numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
        pCodecCtx->height);
  buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));

    // Assign appropriate parts of buffer to image planes in pFrameRGB
  // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
  // of AVPicture
  avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
   pCodecCtx->width, pCodecCtx->height);

  // Read frames and save first five frames to disk
  i=0;
  while(av_read_frame(pFormatCtx, &packet)>=0) {
     if(packet.stream_index==videoStream) {
         // Decode video frame
    avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
      if(frameFinished) {
       // Convert the image from its native format to RGB
      img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height,pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height,PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL);
      // Convert the image from its native format to RGB
sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize,0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
      if(++i<=5)
       SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height,i);
      }
   }
      // Free the packet that was allocated by av_read_frame
  av_free_packet(&packet);
  }
  // Free the RGB image
  av_free(buffer);
  av_free(pFrameRGB);

  // Free the YUV frame
  av_free(pFrame);

  // Close the codec
  avcodec_close(pCodecCtx);

  // Close the video file
  av_close_input_file(pFormatCtx);

  printf("执行完毕\n");
  system("pause");
  return 0;
}