[BUG] Not extracting Teletext stream

[rboy1]

CCExtractor version: 0.93

In raising this issue, I confirm the following:

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

Necessary information

• Is this a regression (i.e. did it work before)? {YES/NO} NO
• What platform did you use? {Window/Linux/Mac} Windows x64
• What were the used arguments? ccextractorwinfull.exe DVB_Teletext.wtv

Video links

https://drive.google.com/file/d/1og3RQYOI0-P11qNWL2XCWp-wVzs4LJva/view?usp=sharing

Additional information

The file contains a Teletext stream, output from ffmpeg

Stream #0:20x23: Subtitle: dvb_teletext, 492x250

It also plays in Windows Media Center

However ccextractor is unable to recognize and extract the teletext stream

CCExtractor 0.93, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: DVB_Teletext.wtv
[Extract: 1] [Stream mode: Autodetect]
[Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto]
[Timing mode: Auto] [Debug: No] [Buffer input: Yes]
[Use pic_order_cnt_lsb for H.264: No] [Print CC decoder traces: No]
[Target format: .srt] [Encoding: UTF-8] [Delay: 0] [Trim lines: No]
[Add font color data: Yes] [Add font typesetting: Yes]
[Convert case: No][Filter profanity: No] [Video-edit join: No]
[Extraction start time: not set (from start)]
[Extraction end time: not set (to end)]
[Live stream: No] [Clock frequency: 90000]
[Teletext page: Autodetect]
[Start credits text: None]
[Quantisation-mode: CCExtractor's internal function]

-----------------------------------------------------------------
Opening file: DVB_Teletext.wtv
File seems to be a WTV, enabling WTV mode
Analyzing data in general mode
100%  |  12:26
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

Total frames time:        00:00:00:000  (0 frames at 29.97fps)

Min PTS:                                00:00:01:981
Max PTS:                                00:12:28:941
Length:                          00:12:26:960
Done, processing time = 0 seconds
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues

[canihavesomecoffee]

https://sampleplatform.ccextractor.org/sample/175 if above link goes down