How to add subtitles to m3u8

[daominhsangvn]

Version information

• fluent-ffmpeg version: 2.1.2
• ffmpeg version: 4.0.2
• OS: MAC OS

Example Code

ffmpeg(input, { timeout: 432000 }).addOptions([
      '-profile:v baseline', // baseline profile (level 3.0) for H264 video codec
      '-level 3.0',
      '-s 640x360',          // 640px width, 360px height output video dimensions
      '-start_number 0',     // start the first .ts segment at index 0
      '-hls_time 10',        // 10 second segment duration
      '-hls_list_size 0',    // Maxmimum number of playlist entries (0 means all entries/infinite)
      '-f hls'               // HLS format
    ])
      .output(path.join(output, 'playlist.m3u8')).on('end', (err) => {
        console.log('convert done');
      })
      .run();

Above code is working good, it generated various ts files for streaming. But i dont know how to add WebVTT subtitle into the m3u8 playlist. Something like this in the playlist.m3u8:

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO,LANGUAGE="en",URI="subtitles_en.m3u8"

[xedsvg]

Did you try to pass the subtitle as an input?

ffmpeg -i video.mp4 -i subtitle.srt -c copy -c:s webvtt -start_number 0 -hls_time 10 -hls_list_size 0 -f hls out/index.m3u8

[Source]

[karimkhamwani]

@xedsvg your cmd works in cmd but how to pass vtt file to this package? any example

[xedsvg]

@karimkhamwani what do you mean? It should be the same example as above. You just replace subtitle.srt with your subtitle.vtt. Can you post your code so we can understand what do you mean?

[juliosouzam]

@karimkhamwani can you tell us if this solution works? and put some final example.

[halconel]

Did you try to pass the subtitle as an input?

ffmpeg -i video.mp4 -i subtitle.srt -c copy -c:s webvtt -start_number 0 -hls_time 10 -hls_list_size 0 -f hls out/index.m3u8

[Source]

it does not work for me

---

command:

ffmpeg -i sample_video_transcript.srt -i sample_video.mp4 \
  -c:v copy -c:a copy -c:s webvtt \
  -f hls \
  -hls_time 6 -hls_list_size 0 -hls_allow_cache 1 -start_number 1 \
  -master_pl_name master.m3u8 output/index.m3u8

output master.m3u8

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=1217707,RESOLUTION=720x1280
index.m3u8

missing line in master.m3u8

...
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO,LANGUAGE="en",URI="0/index_vtt.m3u8"
...