func: static int copy_chapters(InputFile *ifile, OutputFile *ofile, int copy_metadata)
  
  {
  
      AVFormatContext *is = ifile->ctx;
  
      AVFormatContext *os = ofile->ctx;
  
      int i;
  
  
  
      for (i = 0; i < is->nb_chapters; i++) {
  
          AVChapter *in_ch = is->chapters[i], *out_ch;
  
          int64_t ts_off   = av_rescale_q(ofile->start_time - ifile->ts_offset,
  
                                         AV_TIME_BASE_Q, in_ch->time_base);
  
          int64_t rt       = (ofile->recording_time == INT64_MAX) ? INT64_MAX :
  
                             av_rescale_q(ofile->recording_time, AV_TIME_BASE_Q, in_ch->time_base);
  
  
  
  
  
          if (in_ch->end < ts_off)
  
              continue;
  
          if (rt != INT64_MAX && in_ch->start > rt + ts_off)
  
              break;
  
  
  
          out_ch = av_mallocz(sizeof(AVChapter));
  
          if (!out_ch)
  
              return AVERROR(ENOMEM);
  
  
  
          out_ch->id        = in_ch->id;
  
          out_ch->time_base = in_ch->time_base;
  
          out_ch->start     = FFMAX(0,  in_ch->start - ts_off);
  
          out_ch->end       = FFMIN(rt, in_ch->end   - ts_off);
  
  
  
          if (copy_metadata)
  
              av_dict_copy(&out_ch->metadata, in_ch->metadata, 0);
  
  
  
          os->nb_chapters++;
  
          os->chapters = av_realloc(os->chapters, sizeof(AVChapter) * os->nb_chapters);
  
          if (!os->chapters)
  
              return AVERROR(ENOMEM);
  
          os->chapters[os->nb_chapters - 1] = out_ch;
  
      }
  
      return 0;
  
  }
  