[BUG] Unable to extract CEA708 closed captions #730

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claunia · 2026-01-29T16:52:11Z

claunia commented

2026-01-29 16:52:11 +00:00

Originally created by @ProjectEGU on GitHub (Jan 1, 2023).

CCExtractor version: 0.94

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)? No
What platform did you use? Windows
What were the used arguments? ccextractorwinfull.exe cea708_dtv.mpg

Video links

https://www.pixeltools.com/mpeg/cea708_dtv.mpg

Additional information

Relevant MediaInfo portion:

Text
ID                                       : 481 (0x1E1)-1
Menu ID                                  : 1 (0x1)
Format                                   : EIA-708
Muxing mode                              : A/53 / DTVCC Transport
Muxing mode, more info                   : Muxed in Video #1
Duration                                 : 5 s 5 ms
Bit rate mode                            : Constant
Stream size                              : 0.00 Byte (0%)

Relevant info from pixeltools website:
CEA 708 DTV User moveable and re-sizable captioning for HDTV

Expected text content:

This is a demo of the 
Closed Captioning Insertion 
From PixelTools 
Have a Nice Day!

Originally created by @ProjectEGU on GitHub (Jan 1, 2023). CCExtractor version: 0.94 # 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)? `No` - What platform did you use? `Windows` - What were the used arguments? `ccextractorwinfull.exe cea708_dtv.mpg` # Video links https://www.pixeltools.com/mpeg/cea708_dtv.mpg # Additional information Relevant MediaInfo portion: ``` Text ID : 481 (0x1E1)-1 Menu ID : 1 (0x1) Format : EIA-708 Muxing mode : A/53 / DTVCC Transport Muxing mode, more info : Muxed in Video #1 Duration : 5 s 5 ms Bit rate mode : Constant Stream size : 0.00 Byte (0%) ``` Relevant info from [pixeltools website](https://www.pixeltools.com/tech-tip-closed-captioning-existing.html): `CEA 708 DTV User moveable and re-sizable captioning for HDTV` Expected text content: ``` This is a demo of the Closed Captioning Insertion From PixelTools Have a Nice Day! ```

claunia added the CEA-708 GSOC-2023 labels 2026-01-29 16:52:11 +00:00

claunia closed this issue

2026-01-29 16:52:11 +00:00

claunia commented

2026-01-29 16:52:12 +00:00

@tirth-bhagwat commented on GitHub (Mar 17, 2023):

I tried to extract subtitles from the same video file on Fedora 37 (6.1.18-200.fc37.x86_64) but a blank .srt file is generated.

Command: /home/tirth/Forks/ccextractor-fork/linux/ccextractor cea708_dtv.mpg > ./op2.txt
Output of command : op2.txt

@tirth-bhagwat commented on GitHub (Mar 17, 2023): I tried to extract subtitles from the same video file on Fedora 37 (6.1.18-200.fc37.x86_64) but a blank `.srt` file is generated. Command: `/home/tirth/Forks/ccextractor-fork/linux/ccextractor cea708_dtv.mpg > ./op2.txt` Output of command : [op2.txt](https://github.com/CCExtractor/ccextractor/files/11002205/op2.txt)

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Reference: starred/ccextractor#730