NGX_HTTP_MP4_STSC_ATOM 2651 src/http/modules/ngx_http_mp4_module.c     trak->out[NGX_HTTP_MP4_STSC_ATOM].buf = atom;
NGX_HTTP_MP4_STSC_ATOM 2722 src/http/modules/ngx_http_mp4_module.c     atom = trak->out[NGX_HTTP_MP4_STSC_ATOM].buf;