windows环境下搭建ffmpeg开发环境

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>

extern "C"
{
    #include <libavformat/avformat.h>
    #include <libavutil/dict.h>
}

#pragma comment(lib, "avformat.lib")
#pragma comment(lib, "avutil.lib")

int main ()
{
    AVFormatContext *fmt_ctx = NULL;
    AVDictionaryEntry *tag = NULL;
    int ret = 0;

    av_register_all();
    if ((ret = avformat_open_input(&fmt_ctx, "iphone.mp3", NULL, NULL)))
	{
        return ret;
	}

    while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
	{
        printf("%s=%s\n", tag->key, tag->value);
	}

    avformat_close_input(&fmt_ctx);

	system("pause");
    return 0;
}