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[BUG] Not extracting dvbsub from mp4 #647

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opened 2026-01-29 16:50:06 +00:00 by claunia · 3 comments
claunia commented 2026-01-29 16:50:06 +00:00
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Originally created by @rboy1 on GitHub (Jun 18, 2021).

CCExtractor version: 0.89

CCExtractor 0.89, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
CCExtractor detailed version info
        Version: 0.89
        Git commit: 1d7589e653e73ccd9d74c10cfdd611495cdfc443
        Compilation date: 2021-06-13
        File SHA256: e5ef53bf7ebe8d8e189a5e99cf4f1d7e3301ba15fc7c5c1886c1c81b9d32896d
Libraries used by CCExtractor
        Tesseract Version: 4.00.00alpha
        Leptonica Version: leptonica-1.74 (Dec 31 2016, 10:56:23) [MSC v.1900 LIB Release x86]
        libGPAC Version: 1.0.1
        zlib: 1.2.11
        utf8proc Version: 2.4.0
        protobuf-c Version: 1.3.1
        libpng Version: 1.6.37
        FreeType
        libhash
        nuklear
        libzvbi

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

  • What platform did you use? Windows
  • What were the used arguments?

Video links

https://drive.google.com/file/d/1OENPitCBBU4fXYilDkLoAO09ibtrOu5e/view?usp=sharing

Additional information

The mp4 has a forced english track that plays in VLC (e.g. play at timestamp 36:24). FFmpeg also recognizes the track but ccextractor doesn't seem to be able to process it. Also included the tessdata 3 directory to convert the dvbsub into srt but it isn't recognizing the track so the OCR isn't working either.

Without tessdata directory

CCExtractor 0.89, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: Dvbsub in mp4.mp4
[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: Dvbsub in mp4.mp4
Detected MP4 box with name: ftyp
Detected MP4 box with name: free
File seems to be a MP4
Analyzing data with GPAC (MP4 library)
Opening 'Dvbsub in mp4.mp4': ←[33m[iso file] Box "dec3" (start 2211937835) has 2 extra bytes
←[0mok
Track 1, type=vide subtype=avc1
Track 2, type=soun subtype=ec-3
Track 3, type=subp subtype=MPEG
Track 4, type=text subtype=text
MP4: found 4 tracks: 1 avc and 1 cc
Processing track 1, type=vide subtype=avc1
Processing track 2, type=soun subtype=ec-3
Processing track 3, type=subp subtype=MPEG
Processing track 4, type=text subtype=text

Unsupported track type text:text! Please report.
100%  |  00:00
Closing media: ok
Found 1 AVC track(s). Found 1 CC track(s).


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

Min PTS:                                00:00:00:000
Max PTS:                                00:00:00:000
Length:                          00:00:00:000
Done, processing time = 0 seconds

No captions were found in input.
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues

With tessdata directory

CCExtractor 0.89, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: Dvbsub in mp4.mp4
[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: Dvbsub in mp4.mp4
Detected MP4 box with name: ftyp
Detected MP4 box with name: free
File seems to be a MP4
Analyzing data with GPAC (MP4 library)
Opening 'Dvbsub in mp4.mp4': ←[33m[iso file] Box "dec3" (start 2211937835) has 2 extra bytes
←[0mok
Track 1, type=vide subtype=avc1
Track 2, type=soun subtype=ec-3
Track 3, type=subp subtype=MPEG
Track 4, type=text subtype=text
MP4: found 4 tracks: 1 avc and 1 cc
Processing track 1, type=vide subtype=avc1
Processing track 2, type=soun subtype=ec-3
Processing track 3, type=subp subtype=MPEG
Processing track 4, type=text subtype=text

Unsupported track type text:text! Please report.
100%  |  00:00
Closing media: ok
Found 1 AVC track(s). Found 1 CC track(s).


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

Min PTS:                                00:00:00:000
Max PTS:                                00:00:00:000
Length:                          00:00:00:000
Done, processing time = 0 seconds

No captions were found in input.
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues
Originally created by @rboy1 on GitHub (Jun 18, 2021). CCExtractor version: 0.89 ``` CCExtractor 0.89, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- CCExtractor detailed version info Version: 0.89 Git commit: 1d7589e653e73ccd9d74c10cfdd611495cdfc443 Compilation date: 2021-06-13 File SHA256: e5ef53bf7ebe8d8e189a5e99cf4f1d7e3301ba15fc7c5c1886c1c81b9d32896d Libraries used by CCExtractor Tesseract Version: 4.00.00alpha Leptonica Version: leptonica-1.74 (Dec 31 2016, 10:56:23) [MSC v.1900 LIB Release x86] libGPAC Version: 1.0.1 zlib: 1.2.11 utf8proc Version: 2.4.0 protobuf-c Version: 1.3.1 libpng Version: 1.6.37 FreeType libhash nuklear libzvbi ``` # 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 - What platform did you use? Windows - What were the used arguments? <none> # Video links https://drive.google.com/file/d/1OENPitCBBU4fXYilDkLoAO09ibtrOu5e/view?usp=sharing # Additional information The mp4 has a forced english track that plays in VLC (e.g. play at timestamp 36:24). FFmpeg also recognizes the track but ccextractor doesn't seem to be able to process it. Also included the tessdata 3 directory to convert the dvbsub into srt but it isn't recognizing the track so the OCR isn't working either. Without tessdata directory ``` CCExtractor 0.89, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: Dvbsub in mp4.mp4 [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: Dvbsub in mp4.mp4 Detected MP4 box with name: ftyp Detected MP4 box with name: free File seems to be a MP4 Analyzing data with GPAC (MP4 library) Opening 'Dvbsub in mp4.mp4': ←[33m[iso file] Box "dec3" (start 2211937835) has 2 extra bytes ←[0mok Track 1, type=vide subtype=avc1 Track 2, type=soun subtype=ec-3 Track 3, type=subp subtype=MPEG Track 4, type=text subtype=text MP4: found 4 tracks: 1 avc and 1 cc Processing track 1, type=vide subtype=avc1 Processing track 2, type=soun subtype=ec-3 Processing track 3, type=subp subtype=MPEG Processing track 4, type=text subtype=text Unsupported track type text:text! Please report. 100% | 00:00 Closing media: ok Found 1 AVC track(s). Found 1 CC track(s). Total frames time: 00:00:00:000 (0 frames at 29.97fps) Min PTS: 00:00:00:000 Max PTS: 00:00:00:000 Length: 00:00:00:000 Done, processing time = 0 seconds No captions were found in input. Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ``` With tessdata directory ``` CCExtractor 0.89, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: Dvbsub in mp4.mp4 [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: Dvbsub in mp4.mp4 Detected MP4 box with name: ftyp Detected MP4 box with name: free File seems to be a MP4 Analyzing data with GPAC (MP4 library) Opening 'Dvbsub in mp4.mp4': ←[33m[iso file] Box "dec3" (start 2211937835) has 2 extra bytes ←[0mok Track 1, type=vide subtype=avc1 Track 2, type=soun subtype=ec-3 Track 3, type=subp subtype=MPEG Track 4, type=text subtype=text MP4: found 4 tracks: 1 avc and 1 cc Processing track 1, type=vide subtype=avc1 Processing track 2, type=soun subtype=ec-3 Processing track 3, type=subp subtype=MPEG Processing track 4, type=text subtype=text Unsupported track type text:text! Please report. 100% | 00:00 Closing media: ok Found 1 AVC track(s). Found 1 CC track(s). Total frames time: 00:00:00:000 (0 frames at 29.97fps) Min PTS: 00:00:00:000 Max PTS: 00:00:00:000 Length: 00:00:00:000 Done, processing time = 0 seconds No captions were found in input. Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ```
claunia added the enhancementhelp wantedHacktoberfest labels 2026-01-29 16:50:06 +00:00
claunia commented 2026-01-29 16:50:07 +00:00
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@canihavesomecoffee commented on GitHub (Jun 18, 2021):

We don't seem to support this specific type of subs yet.

Unsupported track type text:text! Please report.

MediaInfo:

Text
ID : 3
Format : VobSub
Codec ID : mp4s-E0
Codec ID/Info : The same subtitle format used on DVDs
Duration : 6 min 57 s
Source duration : 1 h 40 min
Bit rate mode : Variable
Stream size : 0.00 Byte (0%)
Source stream size : 180 KiB (0%)
Title : American English (forced) / American English (forced)
Language : English
Forced : No
Encoded date : UTC 2021-06-12 01:26:32
Tagged date : UTC 2021-06-12 01:26:32

@canihavesomecoffee commented on GitHub (Jun 18, 2021): We don't seem to support this specific type of subs yet. > Unsupported track type text:text! Please report. MediaInfo: > Text > ID : 3 > Format : VobSub > Codec ID : mp4s-E0 > Codec ID/Info : The same subtitle format used on DVDs > Duration : 6 min 57 s > Source duration : 1 h 40 min > Bit rate mode : Variable > Stream size : 0.00 Byte (0%) > Source stream size : 180 KiB (0%) > Title : American English (forced) / American English (forced) > Language : English > Forced : No > Encoded date : UTC 2021-06-12 01:26:32 > Tagged date : UTC 2021-06-12 01:26:32
claunia commented 2026-01-29 16:50:07 +00:00
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@canihavesomecoffee commented on GitHub (Nov 20, 2021):

Sample available on https://sampleplatform.ccextractor.org/sample/172

@canihavesomecoffee commented on GitHub (Nov 20, 2021): Sample available on https://sampleplatform.ccextractor.org/sample/172
claunia commented 2026-01-29 16:50:07 +00:00
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@rboy1 commented on GitHub (Oct 18, 2025):

I'm seeing a similar issue with MKV files, it's able to extract the IDX file but doesn't extract or run OCR on the Sub file (image format). With the latest version it this a complex process to add VobSub OCR detection to it?

ccextractorwinfull.exe "Twilight (2008) - Copy.mkv"

CCExtractor 0.95, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: Twilight (2008) - Copy.mkv
[Extract: 1] [Stream mode: Autodetect]
[Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto]
[CEA-708: 63 decoders active]
[CEA-708: using charset "none" for all services]
[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]
[Tesseract PSM: 3]

-----------------------------------------------------------------
Opening file: Twilight (2008) - Copy.mkv
File seems to be a Matroska/WebM container
Analyzing data in Matroska mode


Document type: matroska
Timecode scale: 1000000
Muxing app: libmakemkv v1.18.2 (1.3.10/1.5.2) win(x64-release)
Writing app: MakeMKV v1.18.2 win(x64-release)

Track entry:
    Track number: 1
    UID: 1
    Type: video
    Codec ID: V_MPEG2

Track entry:
    Track number: 2
    UID: 2
    Type: audio
    Codec ID: A_AC3
    Language: eng
    Name: Surround 5.1

Track entry:
    Track number: 3
    UID: 3
    Type: audio
    Codec ID: A_AC3
    Language: spa
    Name: Surround 5.1

Track entry:
    Track number: 4
    UID: 4
    Type: audio
    Codec ID: A_AC3
    Language: eng
    Name: Stereo

Track entry:
    Track number: 5
    UID: 5
    Type: subtitle
    Codec ID: S_VOBSUB
    Language: eng

Track entry:
    Track number: 6
    UID: 6
    Type: subtitle
    Codec ID: S_VOBSUB
    Language: spa

Track entry:
    Track number: 7
    UID: 7
    Type: subtitle
    Codec ID: S_VOBSUB
    Language: spa
 99%  |  121:34
100%  |  121:34
Output file: Twilight (2008) - Copy_eng.idx
Error: VOBSUB not supported
Output file: Twilight (2008) - Copy_spa.idx
Error: VOBSUB not supported
Output file: Twilight (2008) - Copy_spa_1.idx
Error: VOBSUB not supported

Found no AVC track.

Total frames time:        00:00:00:000  (0 frames at 29.97fps)
Done, processing time = 147 seconds
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues
@rboy1 commented on GitHub (Oct 18, 2025): I'm seeing a similar issue with MKV files, it's able to extract the IDX file but doesn't extract or run OCR on the Sub file (image format). With the latest version it this a complex process to add VobSub OCR detection to it? ``` ccextractorwinfull.exe "Twilight (2008) - Copy.mkv" CCExtractor 0.95, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: Twilight (2008) - Copy.mkv [Extract: 1] [Stream mode: Autodetect] [Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto] [CEA-708: 63 decoders active] [CEA-708: using charset "none" for all services] [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] [Tesseract PSM: 3] ----------------------------------------------------------------- Opening file: Twilight (2008) - Copy.mkv File seems to be a Matroska/WebM container Analyzing data in Matroska mode Document type: matroska Timecode scale: 1000000 Muxing app: libmakemkv v1.18.2 (1.3.10/1.5.2) win(x64-release) Writing app: MakeMKV v1.18.2 win(x64-release) Track entry: Track number: 1 UID: 1 Type: video Codec ID: V_MPEG2 Track entry: Track number: 2 UID: 2 Type: audio Codec ID: A_AC3 Language: eng Name: Surround 5.1 Track entry: Track number: 3 UID: 3 Type: audio Codec ID: A_AC3 Language: spa Name: Surround 5.1 Track entry: Track number: 4 UID: 4 Type: audio Codec ID: A_AC3 Language: eng Name: Stereo Track entry: Track number: 5 UID: 5 Type: subtitle Codec ID: S_VOBSUB Language: eng Track entry: Track number: 6 UID: 6 Type: subtitle Codec ID: S_VOBSUB Language: spa Track entry: Track number: 7 UID: 7 Type: subtitle Codec ID: S_VOBSUB Language: spa 99% | 121:34 100% | 121:34 Output file: Twilight (2008) - Copy_eng.idx Error: VOBSUB not supported Output file: Twilight (2008) - Copy_spa.idx Error: VOBSUB not supported Output file: Twilight (2008) - Copy_spa_1.idx Error: VOBSUB not supported Found no AVC track. Total frames time: 00:00:00:000 (0 frames at 29.97fps) Done, processing time = 147 seconds Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ```
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