[BUG] X-TIMESTAMP-MAP doesn't show up with DVB subs

[NilsIrl]

CCExtractor version: 0.88

• I have read and understood the contributors guide.
• I have checked that the bug-fix I am reporting can be replicated, or that the feature I am suggesting isn't already present.
• I have checked that the issue I'm posting isn't already reported.
• I have checked that the issue I'm porting isn't already solved and no duplicates exist in closed issues and in opened issues
• I have checked the pull requests tab for existing solutions/implementations to my issue/suggestion.
• I have used the latest available version of CCExtractor to verify this issue exists.

My familiarity with the project is as follows (check one, eg [X] - and delete unchecked ones):

• I have used CCExtractor just a couple of times.

Necessary information

• Is this a regression (did it work before)? idk (probably not)
• What platform did you use? [X] Linux

arguments:

./ccextractor -datapid 0xc37 -out=webvtt files/test1_dvbsub.ts

Video link: http://akini.mbnet.fi/videos/test1_dvbsub.ts

Related to #1127 in goal though they have different "symptoms" and arise in different cases.

[NilsIrl]

Info for some who wants to fix it:

This is the line that calls the function that adds the header (as well as the subtitles) when the input file isn't dvb:

ccextractor/src/lib_ccx/ccx_encoders_common.c

Line 1160 in 3a18151

wrote_something = write_cc_buffer_as_webvtt(data, context);

This is the line that calls the function that doesn't do that:

ccextractor/src/lib_ccx/ccx_encoders_common.c

Line 1220 in 3a18151

wrote_something = write_cc_bitmap_as_webvtt(sub, context);

So you basically want to second line to the the same thing as the first line. Feel free to ask more information if my instructions are unclear.

[NilsIrl]

This is the line in write_cc_buffer_as_webvtt that adds the header:

ccextractor/src/lib_ccx/ccx_encoders_webvtt.c

Line 281 in 3a18151

write_webvtt_header(context);

You want this line to be called in write_cc_bitmap_as_webvtt

[karansdoshi]

Hello I am a newbie and I'm interested in solving this issue.Both the functions have the line write_webvtt_header(context) with the same context.What exactly is the issue?Can you elaborate about buffer and bitmap at bit.
tess.log

test1_dvbsub.zip
This TS file has more than one program. These are the program numbers found:
1501
1502
1503
fin.traineddata not found! Switching to English
VBI/teletext stream ID 5100 (0x13ec) for SID 1503 (0x5df)
Premature end of file - Transport Stream packet is incomplete (expected 188 bytes, got 92).
100% | 03:41
Number of NAL_type_7: 0
Number of VCL_HRD: 0
Number of NAL HRD: 0
Number of jump-in-frames: 0
Number of num_unexpected_sei_length: 0

Min PTS: 21:54:50:849
Max PTS: 21:58:32:650
Length: 00:03:41:801
Done, processing time = 35 seconds
I am not getting the reason behind premature end.Thanks

[NilsIrl]

Looking back at the code, I think this might be solved by #1137 (if it ever gets merged).

[anshravalll]

I believe this issue has been resolved due to the introduction of #1464. Anybody can easily attach the X-TIMESTAMP-MAP by utilizing the --timestamp-map option.