使用FFmpeg转封装为hls(m3u8)流

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• 改造ffmpeg/doc/examples/remuxing.c，支持将输入流转封装为hls协议
• 对应的github地址：GitHub - yagerfgcs/FFmpeg at examples/remuxing_support_hls
• 修改点：增加设置hls头

// example:https://www.ffmpeg.org/ffmpeg-all.html#hls-2
// ffmpeg -i rtmp://xx/livestream -c copy -hls_time 5 -hls_list_size 0 -start_number 1
// -hls_segment_filename /xxdir/test_%Y-%m-%d-%H-%M-%S_%%08t_%%04d.ts /xxdir/test.m3u8
static int write_hls_header(const char* out_filename, AVFormatContext* context) {
  AVDictionary *options = NULL;
  av_dict_set(&options, "hls_time", "5", 0);
  av_dict_set(&options, "hls_list_size", "0", 0);
  av_dict_set(&options, "start_number", "1", 0);
  av_dict_set(&options, "strftime", "1", 0);
  av_dict_set(&options, "hls_flags",
              "second_level_segment_duration+second_level_segment_index", 0);

  char hls_segment_filename[1024];
  memset(hls_segment_filename, 0, 1024);
  sprintf(hls_segment_filename, "%s/%s", av_dirname(out_filename), "%Y-%m-%d-%H-%M-%S_%%08t_%%04d.ts");
  av_dict_set(&options, "hls_segment_filename", hls_segment_filename, 0);
  return avformat_write_header(context, options != NULL ? &options : NULL);
}
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