[BUG] Multi-track webvtt subtitles come out decapitated #494

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claunia · 2026-01-29T16:45:21Z

claunia commented

2026-01-29 16:45:21 +00:00

Originally created by @FossPrime on GitHub (Jun 6, 2019).

Description
The WEBVTT header is missing from all but one of the output subtitles. Is this intended behaviour? FFMpeg refuses to process these, for good reason.

Video links (replace text below with your links)

tripple.zip

Necessary information

CCExtractor version (using the --version parameter preferably) : tag v0.88
Is this a regression (did it work before)? [x] NO | [ ] YES - please specify the last known working version
What platform did you use? [ ] Windows - [x] Linux - [ ] Mac
What were the used arguments? -out=webvtt

Paperwork

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 am an active contributor to CCExtractor.

Originally created by @FossPrime on GitHub (Jun 6, 2019). **Description** The WEBVTT header is missing from all but one of the output subtitles. Is this intended behaviour? FFMpeg refuses to process these, for good reason. **Video links (replace text below with your links)** [tripple.zip](https://github.com/CCExtractor/ccextractor/files/3263768/tripple.zip) **Necessary information** - CCExtractor version (using the --version parameter preferably) : tag v0.88 - Is this a regression (did it work before)? [x] NO | [ ] YES - *please specify the last known working version* - What platform did you use? [ ] Windows - [x] Linux - [ ] Mac - What were the used arguments? `-out=webvtt` **Paperwork** - [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 am an active contributor to CCExtractor.

claunia referenced this issue

2026-01-29 17:15:41 +00:00

[PR #494] [CLOSED] Updated GPAC library to v0.6.2 #1312

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Reference: starred/ccextractor#494