1. #include <stdio.h>
    3. #define __STDC_CONSTANT_MACROS
    5. #ifdef _WIN32
    6. extern "C"{
    7. #include "libavformat/avformat.h"
    8. };
    9. #else
    10. #ifdef __cplusplus
    11. extern "C"{
    12. #endif
    13. #include <libavformat/avformat.h>
    14. #ifdef __cplusplus
    15. };
    16. #endif
    17. #endif
    19. int main(int argc, char* argv[]){
    20.     AVFormatContext *ifmt_ctx = NULL;
    21.     AVPacket pkt;
    22.     int ret, i;
    23.     int videoindex = -1, audioindex = -1;
    24.     const char *in_filename = "in.flv";
    25.     const char *out_filename_v = "out.h264";
    26.     const char *out_filename_a = "out.mp3";
    27.     av_register_all();
    28.     if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
    29.         printf("Could not open input file.");
    30.         return -1;
    31.     }
    32.     if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
    33.         printf("Failed to retrieve input stream information");
    34.         return -1;
    35.     }
    36.     videoindex = -1;
    37.     for (i = 0; i<ifmt_ctx->nb_streams; i++) {
    38.         if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
    39.             videoindex = i;
    40.         }
    41.         else if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
    42.             audioindex = i;
    43.         }
    44.     }
    45.     printf("===========================\Input Video===========================\n");
    46.     av_dump_format(ifmt_ctx, 0, in_filename, 0);
    47.     printf("==================================================================\n");
    48.     FILE *fp_audio = fopen(out_filename_a, "wb+");
    49.     FILE *fp_video = fopen(out_filename_v, "wb+");
    50.     while (av_read_frame(ifmt_ctx, &pkt) >= 0) {
    51.         if (pkt.stream_index == videoindex) {
    52.             printf("Write Video Packet. size:%d\tpts:%lld\n", pkt.size, pkt.pts);
    53.             fwrite(pkt.data, 1, pkt.size, fp_video);
    54.         }
    55.         else if (pkt.stream_index == audioindex) {
    56.             /*注意：FLV/MP4/MKV等格式中的AAC码流（上述封装格式中的AAC的AVPacket中的数据缺失了7字节的ADTS文件头）*/
    57.             printf("Write Audio Packet. size:%d\tpts:%lld\n", pkt.size, pkt.pts);
    58.             fwrite(pkt.data, 1, pkt.size, fp_audio);
    59.         }
    60.         av_free_packet(&pkt);
    61.     }
    62.     fclose(fp_video);
    63.     fclose(fp_audio);
    64.     avformat_close_input(&ifmt_ctx);
    65.     if (ret < 0 && ret != AVERROR_EOF) {
    66.         printf("Error occurred.\n");
    67.         return -1;
    68.     }
    69.     return 0;
    70. }

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