Thank you for your response. Yes I did validated it and it the following is the message on the webvtt, everything else was OK.
Playlist Syntax:
Warning: (0:0) Subtitle playlists will be validated, but subtitle segments will not
Processed 0 out of 6 segments
I didnt find a way to validate the webvtt itself, but I have one sample here.
WEBVTT
X-TIMESTAMP-MAP=MPEGTS:10134, LOCAL:00:00:00.000
NOTE 0X15F830E08 -> 0X15F85FCC8
18:12:07.461 --> 18:12:09.596 line:92% size:100% align:start
I certainly can't reach out
to them for help,
NOTE 0X15F86143E -> 0X15F87D200
18:12:09.663 --> 18:12:10.931 line:100% size:100% align:start
but I know you can.
Second webvtt file looks like this
WEBVTT
X-TIMESTAMP-MAP=MPEGTS:10134, LOCAL:00:00:00.000
NOTE 0X15F8C670C -> 0X15F8EB192
18:12:14.267 --> 18:12:15.936 line:100% size:100% align:start
So I must present my agenda
NOTE 0X15F8EC908 -> 0X15F91138E
18:12:16.002 --> 18:12:17.671 line:92% size:100% align:start
to my own people
__________________________________________________
Following is some details of the matching segment
[PACKET]
codec_type=video
stream_index=1
pts=5897415648
pts_time=65526.840533
dts=5897412645
dts_time=65526.807167
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=16401
pos=752
flags=K
[/PACKET]
[PACKET]
codec_type=video
stream_index=1
pts=5897421654
pts_time=65526.907267
dts=5897415648
dts_time=65526.840533
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=2539
pos=17860
flags=_
[/PACKET]
[PACKET]
codec_type=video
stream_index=1
pts=5897418651
pts_time=65526.873900
dts=5897418651
dts_time=65526.873900
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=145
pos=20492
flags=_
[/PACKET]