gpac/mp4box.js

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JavaScript version of GPAC's MP4Box tool

Is gpac/mp4box.js beginner-friendly?

The maintainers of gpac/mp4box.js usually reply to a pull request within 1 day. No beginner-friendly issue is open right now; the list below has the other issues we hold for it.

Stars
2.5k
Forks
390
Open beginner issues
0
Indexed issues
33
Avg merge
1d 17h
Merged PRs (30d)
8
Dominant language
TypeScript
License
BSD-3-Clause
Last GitHub push
Sep 23, 2026
Latest indexed
Oct 4, 2026
No contributing guide
No code of conduct
Beginner labels
No beginner labels indexed

How to contribute to gpac/mp4box.js

  1. There is no contributing guide, so start from the README and a few recently merged pull requests to see how changes are proposed.
  2. Your contributions will be published under the project's BSD-3-Clause license.
  3. Follow the repository to hear when a new beginner-friendly issue opens, or look through the other issues below.
Beginner friendly Everything
Open All

Issues somebody may already be working on are listed last. List everything by date

  • mp4box.js — 20-byte `sgpd` box with large `entry_count` causes unbounded loop and heap OOM abort
    Open
    • Is something wrong?

    Difficulty 2/5 1-3 hours Newbie friendliness 77/100

    gpac/mp4box.js#581 ·

    Maintainers usually reply within 1 day

  • mp4box.appendBuffer(ab) returns offset that make an infinite loop
    Open
    • Is something wrong?
    bug

    Difficulty 3/5 1-2 days Newbie friendliness 32/100

    gpac/mp4box.js#551 · 1 comment ·

    Maintainers usually reply within 1 day

  • Loss of precision in `DataStream.readUint64()`
    Open
    • Is something wrong?
    bug

    Difficulty 2/5 1-3 hours Newbie friendliness 45/100

    gpac/mp4box.js#544 ·

    Maintainers usually reply within 1 day

  • Can there be a way to disable logging?
    Open
    • Is something wrong?
    enhancement

    Difficulty 2/5 1-3 hours Newbie friendliness 48/100

    gpac/mp4box.js#528 · 2 comments ·

    Maintainers usually reply within 1 day

  • Seeking fragmented file broken
    Open
    • Is something wrong?
    bug

    Difficulty 3/5 1-2 days Newbie friendliness 40/100

    gpac/mp4box.js#520 ·

    Maintainers usually reply within 1 day

  • Improvements for `colr` box.
    Open
    • Is something wrong?
    enhancement

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    gpac/mp4box.js#495 ·

    Maintainers usually reply within 1 day

  • Examples/docs request: subtitle processing
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 30/100

    gpac/mp4box.js#483 ·

    Maintainers usually reply within 1 day

  • MP4Box.js crashes with uncompressed audio.
    Open
    • Is something wrong?
    bug

    Difficulty 4/5 3-5 days Newbie friendliness 40/100

    gpac/mp4box.js#467 · 2 comments · 1 reaction ·

    Maintainers usually reply within 1 day

  • Feature Request: View mdat Data
    Open
    • Is something wrong?
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 12/100

    gpac/mp4box.js#460 · 7 comments ·

    Maintainers usually reply within 1 day

  • Is there an example of combining jpegs into an mpeg stream?
    Open
    • Is something wrong?
    question

    Difficulty 5/5 Over a week Newbie friendliness 20/100

    gpac/mp4box.js#449 ·

    Maintainers usually reply within 1 day

  • Add support vexu box
    Open
    • Is something wrong?
    box request

    Difficulty 3/5 1-2 days Newbie friendliness 25/100

    gpac/mp4box.js#394 · 1 comment ·

    Maintainers usually reply within 1 day

  • appendBuffer by chunks using a readable stream
    Open
    • Is something wrong?
    question

    Difficulty 4/5 3-5 days Newbie friendliness 15/100

    gpac/mp4box.js#387 ·

    Maintainers usually reply within 1 day

  • Wrong codec information encoded during video creation
    Open
    • Is something wrong?
    question

    Difficulty 4/5 3-5 days Newbie friendliness 20/100

    gpac/mp4box.js#384 ·

    Maintainers usually reply within 1 day

  • Origin of cmex / cmin
    Open
    • Is something wrong?
    question

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    gpac/mp4box.js#377 ·

    Maintainers usually reply within 1 day

  • Seek to a frame number
    Open
    • Is something wrong?
    question

    Difficulty 4/5 3-5 days Newbie friendliness 20/100

    gpac/mp4box.js#361 · 1 comment ·

    Maintainers usually reply within 1 day

  • How to extract samples from fragmented MP4 file?
    Open
    • Is something wrong?
    question

    Difficulty 4/5 3-5 days Newbie friendliness 18/100

    gpac/mp4box.js#360 · 2 comments ·

    Maintainers usually reply within 1 day

  • Parse user metadata
    Open
    • Is something wrong?
    question

    Difficulty 4/5 3-5 days Newbie friendliness 22/100

    gpac/mp4box.js#356 · 1 comment · 3 reactions ·

    Maintainers usually reply within 1 day

  • 5.1 track showing only 2 channels
    Open
    • Is something wrong?
    enhancement

    Difficulty 3/5 1-2 days Newbie friendliness 35/100

    gpac/mp4box.js#288 · 1 comment · 2 reactions ·

    Maintainers usually reply within 1 day

  • `ItemLocationBox` (`iloc`) `base_offset` field is incorrect
    Open
    • Is something wrong?
    bug

    Difficulty 2/5 1-3 hours Newbie friendliness 45/100

    gpac/mp4box.js#258 ·

    Maintainers usually reply within 1 day

  • Question: how convert fragment-mp4 to non-fragmented-mp4?
    Open
    • Is something wrong?
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 10/100

    gpac/mp4box.js#257 · 3 comments · 1 reaction ·

    Maintainers usually reply within 1 day

  • Streaming a MP4 to Browser
    Open
    • Is something wrong?
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 15/100

    gpac/mp4box.js#89 · 3 comments ·

    Maintainers usually reply within 1 day

  • Adding an audio track & concatenating multiple mp4 files (-add and -cat)
    Open
    • Is something wrong?
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 8/100

    gpac/mp4box.js#72 · 1 comment ·

    Maintainers usually reply within 1 day

  • Issue Reading QT Compressed mdat Box
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 20/100

    gpac/mp4box.js#69 · 2 comments ·

    Maintainers usually reply within 1 day

  • update wiki to reflect current state
    May be free again Open
    • Is something wrong?
    enhancement

    gpac/mp4box.js#66 · 1 assignee ·

    Maintainers usually reply within 1 day

  • Write as well as read.
    Open
    • Is something wrong?
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 10/100

    gpac/mp4box.js#43 · 3 comments ·

    Maintainers usually reply within 1 day

  • Seek should bring back range instead of offset
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 22/100

    gpac/mp4box.js#26 · 12 comments ·

    Maintainers usually reply within 1 day

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