ff_hls_write_subtitle_rendition 1425 libavformat/hlsenc.c             ff_hls_write_subtitle_rendition(hls->m3u8_out, sgroup, vtt_m3u8_rel_name, vs->language, i, hls->has_default_key ? vs->is_default : 1);
ff_hls_write_subtitle_rendition   43 libavformat/hlsplaylist.h void ff_hls_write_subtitle_rendition(AVIOContext *out, const char *sgroup,