简易改写Ffmpeg

来源：互联网发布：变频器仿真软件下载编辑：程序博客网时间：2024/04/29 19:35

防止调用Ffmpeg 的方法时导致主线程退出

注意：需要对应修改exit_program()!!

源代码：

//register_exit(ffmpeg_cleanup); 这个可以不需要了
用 ffmpeg_cleanup(0);
代替 exit_program(received_nb_signals ? 255 : main_return_code);

读取文件信息：

int ff_PrintFile(char * filepath)
{
   AVFormatContext * pFormatContext=NULL;
   av_register_all();
   pFormatContext = avformat_alloc_context();
   if(avformat_open_input(&pFormatContext,filepath,NULL,NULL)!=0)
   {
       printf("Can not open the media file you specified!\n");
       return -1;

   }
    if(avformat_find_stream_info(pFormatContext, NULL) < 0){
       return -1;
   }
    av_dump_format(pFormatContext, 0, filepath, 0);
   printf("\n****************file information*****************\n");
   int video_stream=-1;
   int audio_stream=-1;
   int i=0;
    for (i = 0; i < (int)pFormatContext->nb_streams; i++) {
       AVStream* ist = pFormatContext->streams[i];
       printf(" Stream #%d: timebase={num=%d, den=%d}\n", i, ist->time_base.num, ist->time_base.den);
       if(pFormatContext->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
       {
           video_stream=i;
       }
       if(pFormatContext->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO)
       {
           audio_stream=i;
       }
   }
   if(audio_stream==-1&&video_stream==-1)return -1;
   printf("\n");
   printf("input:%s",pFormatContext->iformat->long_name);
   AVCodecContext   *pCodecCtx,*pCodecCtx_au;
   if(video_stream!=-1)
   {
       pCodecCtx=pFormatContext->streams[video_stream]->codec;

       printf("size:%d x %d",pCodecCtx->width,pCodecCtx->height);
       float framerate_temp=(pFormatContext->streams[video_stream]->r_frame_rate.num)/(pFormatContext->streams[video_stream]->r_frame_rate.den);
       printf("framerate:%5.2ffps",framerate_temp);
   }
   printf("\n");
   if(audio_stream!=-1)
   {
       pCodecCtx_au=pFormatContext->streams[audio_stream]->codec;
       //pCodec_au=avcodec_find_decoder(pCodecCtx_au->codec_id);
       //printf("%s",pCodecCtx_au->codec->name);
       printf("profile:%d",pCodecCtx_au->profile);
       printf("level:%d",pCodecCtx_au->level);
       printf("sample_rate:%d",pCodecCtx_au->sample_rate);
       printf("channels:%d",pCodecCtx_au->channels);
   }
    printf("bit_rate:%5.2fkbps",pFormatContext->bit_rate/1000.0);
   int tns, thh, tmm, tss;
   tns = (pFormatContext->duration)/1000000;
   thh = tns / 3600;
   tmm = (tns % 3600) / 60;
   tss = (tns % 60);
   printf("\n");
    printf("duration:%02d:%02d:%02d",thh,tmm,tss);
   printf("\n");
   AVDictionaryEntry *m = NULL;
   while(m=av_dict_get(pFormatContext->metadata,"",m,AV_DICT_IGNORE_SUFFIX))
   {
       printf("%s:",m->key);
       printf("%s",m->value);
       printf("\n");
   }


   printf("\n****************file information*****************\n");
   avformat_close_input(&pFormatContext);

   return 0;
}

修改文件作者和专辑等信息

可在opt 下方法open_output_file添加

av_dict_set(&oc->metadata, "artist", "ffedu", AV_DICT_MATCH_CASE);
av_dict_set(&oc->metadata, "album", "ffedu", AV_DICT_MATCH_CASE);

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