Bug: Can't open huge .mp4 files #466

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claunia · 2026-01-29T16:44:41Z

claunia commented

2026-01-29 16:44:41 +00:00

Originally created by @Pennyliu999 on GitHub (Dec 10, 2018).

Please prefix your issue with one of the following: [BUG], [PROPOSAL], [QUESTION].

CCExtractor version (using the --version parameter preferably) : X.X

In raising this issue, I confirm the following (please check boxes, eg [X] - and delete unchecked ones):

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.

My familiarity with the project is as follows (check one, eg [X] - and delete unchecked ones):

I have never used CCExtractor.
[x I have used CCExtractor just a couple of times.
I absolutely love CCExtractor, but have not contributed previously.
I am an active contributor to CCExtractor.

Necessary information

Is this a regression (did it work before)? [ ] NO | [x] YES - please specify the last known working version 0.85
What platform did you use? [x] Windows - [ ] Linux - [ ] Mac

I tried to use 0.87 to extract the subtitles from many MP4 files which are over 4GB, and I failed in all of them, sometimes the file is failed to open, like,

Analyzing data with GPAC (MP4 library)
Opening 'Z:\1965.mp4': Failed to open input file (gf_isom_open() returned error)

Sometimes it just stopped, I copied the warning message from the pop-up window here,

AppName: ccextractorwin.exe AppVer: 0.0.0.0
ModName: ccextractorwin.exe
ModVer: 0.0.0.0 Offset: 001067e3

I also tried the command line and it doesn't work either.

I confirm in 0.85 I can open the files and extract the subtitles.

Originally created by @Pennyliu999 on GitHub (Dec 10, 2018). Please prefix your issue with one of the following: [BUG], [PROPOSAL], [QUESTION]. CCExtractor version (using the --version parameter preferably) : **X.X** **In raising this issue, I confirm the following (please check boxes, eg [X] - and delete unchecked ones):** - [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. **My familiarity with the project is as follows (check one, eg [X] - and delete unchecked ones):** - [ ] I have never used CCExtractor. - [x I have used CCExtractor just a couple of times. - [ ] I absolutely love CCExtractor, but have not contributed previously. - [ ] I am an active contributor to CCExtractor. **Necessary information** - Is this a regression (did it work before)? [ ] NO | [x] YES - *please specify the last known working version* 0.85 - What platform did you use? [x] Windows - [ ] Linux - [ ] Mac I tried to use 0.87 to extract the subtitles from many MP4 files which are over 4GB, and I failed in all of them, sometimes the file is failed to open, like, Analyzing data with GPAC (MP4 library) Opening 'Z:\1965.mp4': Failed to open input file (gf_isom_open() returned error) Sometimes it just stopped, I copied the warning message from the pop-up window here, AppName: ccextractorwin.exe AppVer: 0.0.0.0 ModName: ccextractorwin.exe ModVer: 0.0.0.0 Offset: 001067e3 I also tried the command line and it doesn't work either. I confirm in 0.85 I can open the files and extract the subtitles.

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Reference: starred/ccextractor#466