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[BUG] Segmentation Fault when converting from McPoodle raw to webVTT #608

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opened 2026-01-29 16:48:57 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 16:48:57 +00:00
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Originally created by @bbgdzxng1 on GitHub (Jan 24, 2021).

CCExtractor version: 0.88

In raising this issue, I confirm the following:

  • 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.
  • 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) unknown
  • What platform did you use? macOS 10.15.7, CCExtractor version: 0.88 installed via $ brew install ccextractor
  • What were the used arguments? Full demonstration of complete workflow from scc > raw > ccextractor

Download cc sample from https://archive.org/download/cc_sample

$ curl --silent --location --request GET "https://archive.org/download/cc_sample/cc_sample.scc" -o cc_sample.scc
$ dos2unix --newfile cc_sample.scc cc_sample_dos2unix.scc

Convert scc file to McPoodle's raw format using McPoodle's SCCTOOLS' scc2raw.pl, available from http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/scc2raw.pl. Carlos uses McPoodle's SCCTOOLS as part of this project.

$ perl scc2raw.pl cc_sample_dos2unix.scc cc_sample_dos2unix.bin

At this point, we have a McPoodle raw format file, which has been generated by McPoodle's own tool.

Now attempting to convert McPoodle's raw format to VTT, using ccextractor 0.88 (see Additional Information section for error message)

$ ccextractor -debug -in=raw -out=webvtt-full -utf8 cc_sample_dos2unix.bin -o cc_sample_dos2unix.vtt

Additional information

Converting from McPoodle Raw format to SRT is successful. Converting from McPoodle Raw format to VTT fails with Segmentation Fault.

Check input using report

$ ccextractor -debug -in=raw -out=report -utf8 cc_sample_dos2unix.bin
File: cc_sample_dos2unix.bin
Stream Mode: McPoodle's raw
EIA-608: No
CEA-708: No
MPEG-4 Timed Text: No

Converting to SRT is successful

$ ccextractor -debug -in=raw -out=srt -utf8 cc_sample_dos2unix.bin -o cc_sample_dos2unix.srt
CCExtractor 0.88, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: Files (1): cc_sample_dos2unix.bin
[Extract: 1] [Stream mode: McPoodle's raw]
[Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto]
[Timing mode: Auto] [Debug: Yes] [Buffer input: No]
[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] [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: cc_sample_dos2unix.bin
Analyzing data in McPoodle raw mode


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

Min PTS:				00:00:00:001
Max PTS:				00:01:09:070
Length:				 00:01:09:069
Done, processing time = 0 seconds
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues

$ head -n20 cc_sample_dos2unix.srt 
1
00:00:09,243 --> 00:00:12,378
                  Is that what  
                  the Americans 
                  call doodling?

2
00:00:12,413 --> 00:00:13,278
It is more serious              

3
00:00:13,314 --> 00:00:16,081
than you could                  
possibly realize                
Charlotte                       

4
00:00:20,221 --> 00:00:21,020
Good

Converting to webVTT causes Segmentation Fault 11

$ ccextractor -debug -in=raw -out=webvtt-full -utf8 cc_sample_dos2unix.bin -o cc_sample_dos2unix.vtt
CCExtractor 0.88, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: Files (1): cc_sample_dos2unix.bin
[Extract: 1] [Stream mode: McPoodle's raw]
[Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto]
[Timing mode: Auto] [Debug: Yes] [Buffer input: No]
[Use pic_order_cnt_lsb for H.264: No] [Print CC decoder traces: No]
[Target format: .vtt] [Encoding: UTF-8] [Delay: 0] [Trim lines: No]
[Add font color data: Yes] [Add font typesetting: Yes]
[Convert case: 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: cc_sample_dos2unix.bin
Analyzing data in McPoodle raw mode
Segmentation fault: 11

Full commands for replication and sample file are included in this ticket.

Originally created by @bbgdzxng1 on GitHub (Jan 24, 2021). CCExtractor version: 0.88 # In raising this issue, I confirm the following: - [x] I have read and understood the [contributors guide](https://github.com/CCExtractor/ccextractor/blob/master/.github/CONTRIBUTING.md). - [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](https://github.com/CCExtractor/ccextractor/issues?q=is%3Aissue+is%3Aclosed) and in [opened issues](https://github.com/CCExtractor/ccextractor/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) unknown - What platform did you use? macOS 10.15.7, CCExtractor version: 0.88 installed via `$ brew install ccextractor` - What were the used arguments? Full demonstration of complete workflow from scc > raw > ccextractor Download cc sample from https://archive.org/download/cc_sample ``` $ curl --silent --location --request GET "https://archive.org/download/cc_sample/cc_sample.scc" -o cc_sample.scc $ dos2unix --newfile cc_sample.scc cc_sample_dos2unix.scc ``` Convert scc file to McPoodle's raw format using McPoodle's SCCTOOLS' scc2raw.pl, available from http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/scc2raw.pl. Carlos uses McPoodle's SCCTOOLS as part of this project. ``` $ perl scc2raw.pl cc_sample_dos2unix.scc cc_sample_dos2unix.bin ``` At this point, we have a McPoodle raw format file, which has been generated by McPoodle's own tool. Now attempting to convert McPoodle's raw format to VTT, using ccextractor 0.88 (see Additional Information section for error message) ``` $ ccextractor -debug -in=raw -out=webvtt-full -utf8 cc_sample_dos2unix.bin -o cc_sample_dos2unix.vtt ``` # Additional information Converting from McPoodle Raw format to SRT is successful. Converting from McPoodle Raw format to VTT fails with Segmentation Fault. ### Check input using report ``` $ ccextractor -debug -in=raw -out=report -utf8 cc_sample_dos2unix.bin File: cc_sample_dos2unix.bin Stream Mode: McPoodle's raw EIA-608: No CEA-708: No MPEG-4 Timed Text: No ``` ### Converting to SRT is successful ``` $ ccextractor -debug -in=raw -out=srt -utf8 cc_sample_dos2unix.bin -o cc_sample_dos2unix.srt CCExtractor 0.88, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: Files (1): cc_sample_dos2unix.bin [Extract: 1] [Stream mode: McPoodle's raw] [Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto] [Timing mode: Auto] [Debug: Yes] [Buffer input: No] [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] [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: cc_sample_dos2unix.bin Analyzing data in McPoodle raw mode Total frames time: 00:00:00:000 (0 frames at 29.97fps) Min PTS: 00:00:00:001 Max PTS: 00:01:09:070 Length: 00:01:09:069 Done, processing time = 0 seconds Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ``` ``` $ head -n20 cc_sample_dos2unix.srt 1 00:00:09,243 --> 00:00:12,378 Is that what the Americans call doodling? 2 00:00:12,413 --> 00:00:13,278 It is more serious 3 00:00:13,314 --> 00:00:16,081 than you could possibly realize Charlotte 4 00:00:20,221 --> 00:00:21,020 Good ``` ### Converting to webVTT causes Segmentation Fault 11 ``` $ ccextractor -debug -in=raw -out=webvtt-full -utf8 cc_sample_dos2unix.bin -o cc_sample_dos2unix.vtt CCExtractor 0.88, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: Files (1): cc_sample_dos2unix.bin [Extract: 1] [Stream mode: McPoodle's raw] [Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto] [Timing mode: Auto] [Debug: Yes] [Buffer input: No] [Use pic_order_cnt_lsb for H.264: No] [Print CC decoder traces: No] [Target format: .vtt] [Encoding: UTF-8] [Delay: 0] [Trim lines: No] [Add font color data: Yes] [Add font typesetting: Yes] [Convert case: 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: cc_sample_dos2unix.bin Analyzing data in McPoodle raw mode Segmentation fault: 11 ``` Full commands for replication and sample file are included in this ticket.
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