SEI-Stamper 2026-01-21

Overview​

SEI Stamper enables frame-level video synchronization across multiple streams by embedding NTP timestamps into video streams using SEI (Supplemental Enhancement Information).
This plugin features a built-in SEI-supported encoder and decoder, allowing for the synchronization of multiple SRT video streams between OBS instances with the plugin installed.

Disclaimer​

Portions of this project's code and documentation were generated with the assistance of AI tools. By using this software, you acknowledge and agree that:

1. The software is provided "as is", without warranty of any kind.
2. The authors and contributors shall not be liable for any damages or data loss arising from the use of this plugin.

Key Features:

• Frame-accurate synchronization using NTP timestamps
• Multiple hardware encoders: Intel QuickSync, NVIDIA NVENC, AMD AMF
• ️ Multi-Codec Support: H.264, H.265 (HEVC)
• GPU acceleration: Hardware-accelerated encoding with SEI support
• Sender & Receiver: Complete solution for encoding and decoding
• SRT streaming: Built-in SRT receiver for low-latency streaming
• ⏱️ Microsecond precision: NTP-based timing for professional applications

Use Cases​

• Multi-camera live production synchronization
• Remote studio frame-level sync
• Broadcast-quality multi-source alignment
• Live concert/event multi-angle recording

Demo Video​

Watch Demo Video on YouTube

This demonstration shows OBS sending 4 SRT streams with identical settings over a local network. with this plugin, all 4 streams are synchronized to within ±2 frame accuracy(1080p60fps) automatically.