ffmpeg 获取视频宽高

 int main(int argc, char *argv[])
 {
     const char* file_name = "video.mp4";
     int ret;
     unsigned int i;

     AVFormatContext *ifmt_ctx = NULL;

     av_register_all();
     if ((ret = avformat_open_input(&ifmt_ctx, file_name, NULL, NULL)) < ) {
         printf("Cannot open input file\n");
         return ret;
     }

     if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < ) {
         printf("Cannot find stream information\n");
         return ret;
     }

     for (i = ; i < ifmt_ctx->nb_streams; i++) {
         if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
             printf("width:%d\n",ifmt_ctx->streams[i]->codec->width);
             printf("height:%d\n",ifmt_ctx->streams[i]->codec->height);
         }
     }

     return ;
 }

或者用mediainfo

http://blog.csdn.net/leixiaohua1020/article/details/11902195

 int main()
 {
     MediaInfo MI;
     CString width,height;
     MI.Open("file.mp4");
     width = MI.Get(stream_t::Stream_Video,,"Width").c_str();
     height = MI.Get(stream_t::Stream_Video,,"Height").c_str();
     printf("width: %s, height: %s\n", width, height);
     MI.Close();
 }

要是内存数据可以参考

http://blog.csdn.net/leixiaohua1020/article/details/12980423

即自己写好buffer的回调函数然后注册……