bytedeco/javacv

How to read/write SEI(User Data Unregister) from/to H264/HEVC stream?

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#2,379 opened on Feb 9, 2026

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Description

I want to write SEI(User Data Unregister) to H264/HEVC videos by FFmpegFrameRecorder, and read them back by FFmpegFrameGrabber. How should I code? May side_data be another way?

Contributor guide

Research direction
Investigate FFmpeg's AVPacketSideData and AVFrameSideData to handle SEI. Check javacv's current implementation for writing/reading side data. Look for any existing examples in the repository or related issues.
Tech stack
java
Domain
apibackend
Issue type
Documentation
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaGitFFmpeg
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65