bytedeco/javacv

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

Open

#2379 opened on Feb 9, 2026

View on GitHub
 (1 comment) (0 reactions) (0 assignees)Java (6,985 stars) (1,583 forks)batch import
enhancementhelp wantedquestion

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

Tech stack
java
Domain
backend
Issue type
research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
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.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaFFmpeg APISEI concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
This issue seeks a code example for reading and writing SEI User Data Unregistered in H264/HEVC streams using FFmpegFrameRecorder and FFmpegFrameGrabber. The solution likely involves leveraging FFmpeg's side data mechanism or directly manipulating SEI NAL units. Contributors should examine the javacv source code for these classes and consult FFmpeg documentation on av frame get side data and related functions. Providing a working code snippet or pointing to existing examples would resolve the issue.