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[BUG] Error: Broken AVC stream on Twitch.tv stream file #792

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opened 2026-01-29 16:53:34 +00:00 by claunia · 4 comments
claunia commented 2026-01-29 16:53:34 +00:00
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Originally created by @superbonaci on GitHub (Dec 10, 2023).

Compiled version form latest commit 79aaf86:

ccextractor --version
CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
CCExtractor detailed version info
	Version: 0.94
	Git commit: 79aaf8659390850d570a96a764d8b7f29557ce6a
	Compilation date: 2023-12-10
	CEA-708 decoder: C
	File SHA256: Could not open file
Libraries used by CCExtractor
	libGPAC Version: 2.2.1
	zlib: 1.2.11
	utf8proc Version: 2.4.0
	protobuf-c Version: 1.3.1
	libpng Version: 1.6.37
	FreeType
	libhash
	nuklear
	libzvbi

Trying to extract subtitles from Twitch.tv stream generates a 0 byte file and errors:

$ ccextractor file.ts
CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: file.ts
[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: 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][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: file.ts
File seems to be a transport stream, enabling TS mode
Analyzing data in general mode
Changed fps using NAL to: 120.000000

Found large gap(14566) in PTS! Trying to recover ...
Error: Broken AVC stream - Leading bytes are non-zero...
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues

The error will happen with any ts from any Twitch.tv stream, sample:

file.ts.zip

Originally created by @superbonaci on GitHub (Dec 10, 2023). Compiled version form latest commit [79aaf86](https://github.com/CCExtractor/ccextractor/commit/79aaf8659390850d570a96a764d8b7f29557ce6a): ``` ccextractor --version CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- CCExtractor detailed version info Version: 0.94 Git commit: 79aaf8659390850d570a96a764d8b7f29557ce6a Compilation date: 2023-12-10 CEA-708 decoder: C File SHA256: Could not open file Libraries used by CCExtractor libGPAC Version: 2.2.1 zlib: 1.2.11 utf8proc Version: 2.4.0 protobuf-c Version: 1.3.1 libpng Version: 1.6.37 FreeType libhash nuklear libzvbi ``` Trying to extract subtitles from Twitch.tv stream generates a 0 byte file and errors: ``` $ ccextractor file.ts CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: file.ts [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: 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][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: file.ts File seems to be a transport stream, enabling TS mode Analyzing data in general mode Changed fps using NAL to: 120.000000 Found large gap(14566) in PTS! Trying to recover ... Error: Broken AVC stream - Leading bytes are non-zero... Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ``` The error will happen with any ts from any Twitch.tv stream, sample: [file.ts.zip](https://github.com/CCExtractor/ccextractor/files/13629063/file.ts.zip)
claunia commented 2026-01-29 16:53:35 +00:00
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@superbonaci commented on GitHub (Dec 10, 2023):

Error with another Twitch file:

$ ccextractor output.ts
CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: output.ts
[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: 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][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: output.ts
File seems to be a transport stream, enabling TS mode
Analyzing data in general mode

Found large gap(48073) in PTS! Trying to recover ...
Error: Broken AVC stream - Leading bytes are non-zero...
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues
@superbonaci commented on GitHub (Dec 10, 2023): Error with another Twitch file: ``` $ ccextractor output.ts CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: output.ts [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: 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][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: output.ts File seems to be a transport stream, enabling TS mode Analyzing data in general mode Found large gap(48073) in PTS! Trying to recover ... Error: Broken AVC stream - Leading bytes are non-zero... Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ```
claunia commented 2026-01-29 16:53:35 +00:00
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@superbonaci commented on GitHub (Dec 10, 2023):

Another sample for testing purposes:

1462570126.zip

@superbonaci commented on GitHub (Dec 10, 2023): Another sample for testing purposes: [1462570126.zip](https://github.com/CCExtractor/ccextractor/files/13629094/1462570126.zip)
claunia commented 2026-01-29 16:53:36 +00:00
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@SP-XD commented on GitHub (Jan 26, 2024):

@superbonaci Hey the sample ts files you have given have no embeded subtitles, I converted manually the ts to mp4 using ffmpeg and then tried to convert this was the result:

CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: ../../ccextractor_debug_files/output2.mp4
[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: 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][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: ../../ccextractor_debug_files/output2.mp4
Detected MP4 box with name: ftyp
Detected MP4 box with name: free
Detected MP4 box with name: mdat
File seems to be a MP4
Analyzing data with GPAC (MP4 library)
Opening '../../ccextractor_debug_files/output2.mp4': ok
Track 1, type=vide subtype=avc1
Track 2, type=soun subtype=MPEG
MP4: found 2 tracks: 1 avc and 0 cc
Processing track 1, type=vide subtype=avc1
Processing track 2, type=soun subtype=MPEG

Closing media: ok
Found 1 AVC track(s). Found no dedicated CC track(s).


Total frames time:        00:00:18:451  (553 frames at 29.97fps)

Min PTS:                                00:00:00:066
Max PTS:                                00:00:18:566
Length:                          00:00:18:500
Done, processing time = 0 seconds

No captions were found in input.
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues
@SP-XD commented on GitHub (Jan 26, 2024): @superbonaci Hey the sample ts files you have given have no embeded subtitles, I converted manually the ts to mp4 using ffmpeg and then tried to convert this was the result: ``` CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: ../../ccextractor_debug_files/output2.mp4 [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: 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][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: ../../ccextractor_debug_files/output2.mp4 Detected MP4 box with name: ftyp Detected MP4 box with name: free Detected MP4 box with name: mdat File seems to be a MP4 Analyzing data with GPAC (MP4 library) Opening '../../ccextractor_debug_files/output2.mp4': ok Track 1, type=vide subtype=avc1 Track 2, type=soun subtype=MPEG MP4: found 2 tracks: 1 avc and 0 cc Processing track 1, type=vide subtype=avc1 Processing track 2, type=soun subtype=MPEG Closing media: ok Found 1 AVC track(s). Found no dedicated CC track(s). Total frames time: 00:00:18:451 (553 frames at 29.97fps) Min PTS: 00:00:00:066 Max PTS: 00:00:18:566 Length: 00:00:18:500 Done, processing time = 0 seconds No captions were found in input. Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ```
claunia commented 2026-01-29 16:53:36 +00:00
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@SP-XD commented on GitHub (Jan 26, 2024):

also tried ts sample with subttitles and its working https://tsduck.io/streams/usa-atsc/503.ts

CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: ../../ccextractor_debug_files/503.ts
[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: 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][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: ../../ccextractor_debug_files/503.ts
File seems to be a transport stream, enabling TS mode
Analyzing data in general mode

This TS file has more than one program. These are the program numbers found: 
1
2
3
4
  1%  |  00:00

New video information found
[1920 * 1080] [AR: 03 - 16:9] [FR: 04 - 29.97] [progressive: no]

XDS: ContentAdvisory: US TV Parental Guidelines. Age Rating: TV-14 (Parents Strongly Cautioned)
XDS: [Violence] 
XDS Notice: Program is now Chicago PD
100%  |  01:03
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:        00:01:02:195  (1864 frames at 29.97fps)
CC type 0: 332 (NTSC line 21 field 1 closed captions)
CC type 1: 1864 (NTSC line 21 field 2 closed captions)
CC type 2: 2134 (DTVCC Channel Packet Data)
CC type 3: 690 (DTVCC Channel Packet Start)

Min PTS:                                02:07:41:087
Max PTS:                                02:08:44:183
Length:                          00:01:03:096

Initial GOP time:          00:00:00:000
Final GOP time:          00:00:00:000+19F
Diff. GOP length:          00:00:00:000+19F     (00:00:00:633)

Number of key frames: 42
Total user data fields: 1864
HDTV type user data fields: 1864
Done, processing time = 2 seconds
Issues? Open a ticket here
https://github.com/CCExtractor/ccextractor/issues
@SP-XD commented on GitHub (Jan 26, 2024): also tried ts sample with subttitles and its working https://tsduck.io/streams/usa-atsc/503.ts ``` CCExtractor 0.94, Carlos Fernandez Sanz, Volker Quetschke. Teletext portions taken from Petr Kutalek's telxcc -------------------------------------------------------------------------- Input: ../../ccextractor_debug_files/503.ts [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: 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][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: ../../ccextractor_debug_files/503.ts File seems to be a transport stream, enabling TS mode Analyzing data in general mode This TS file has more than one program. These are the program numbers found: 1 2 3 4 1% | 00:00 New video information found [1920 * 1080] [AR: 03 - 16:9] [FR: 04 - 29.97] [progressive: no] XDS: ContentAdvisory: US TV Parental Guidelines. Age Rating: TV-14 (Parents Strongly Cautioned) XDS: [Violence] XDS Notice: Program is now Chicago PD 100% | 01:03 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: 00:01:02:195 (1864 frames at 29.97fps) CC type 0: 332 (NTSC line 21 field 1 closed captions) CC type 1: 1864 (NTSC line 21 field 2 closed captions) CC type 2: 2134 (DTVCC Channel Packet Data) CC type 3: 690 (DTVCC Channel Packet Start) Min PTS: 02:07:41:087 Max PTS: 02:08:44:183 Length: 00:01:03:096 Initial GOP time: 00:00:00:000 Final GOP time: 00:00:00:000+19F Diff. GOP length: 00:00:00:000+19F (00:00:00:633) Number of key frames: 42 Total user data fields: 1864 HDTV type user data fields: 1864 Done, processing time = 2 seconds Issues? Open a ticket here https://github.com/CCExtractor/ccextractor/issues ```
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