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)) < 0) {
        printf("Cannot open input file
");
        return ret;
    }

    if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
        printf("Cannot find stream information
");
        return ret;
    }

    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
        if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
            printf("%d
",ifmt_ctx->streams[i]->codec->width);
            printf("height:%d
",ifmt_ctx->streams[i]->codec->height);
        }
    }

    return 0;
}

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,0,"Width").c_str();  
    height = MI.Get(stream_t::Stream_Video,0,"Height").c_str();  
    printf(" %s, height: %s
", 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……