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Test with the following command for the webvtt subtitle: $ ./ffmpeg -y -i input_with_subtitle.mkv \ -b✌️0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \ -b🅰️0 256k \ -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0🅰️0 -map 0:s:0 \ -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \ -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \ 10 -master_pl_publish_rate 10 -hls_flags \ delete_segments+discont_start+split_by_time ./tmp/video.m3u8 Check the master m3u8: $ cat tmp/master.m3u8 #EXTM3U #EXT-X-VERSION:3 #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitle",NAME="subtitle_0",DEFAULT=YES,URI="video_vtt.m3u8" #EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33",SUBTITLES="subtitle" video.m3u8 Check the result by convert to mkv: $ ./ffmpeg -strict experimental -i ./tmp/master.m3u8 -c:v copy -c:a mp2 -c:s srt ./test.mkv Signed-off-by: Limin Wang <lance.lmwang@gmail.com>