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Firmware v2.51A Release Notes
Overview
Firmware v2.51A delivers significant enhancements to the Ambarella-based H.265 HDMI encoder, focusing on improved encoding efficiency, greater streaming flexibility, and expanded support for professional broadcasting workflows. This update is particularly beneficial for live streaming, security monitoring, and multi-platform content distribution applications.
1. New B-Frame Support
What’s New: B-frame support is now available and can be enabled in the encoder settings.
How It Works: When enabled, the encoder switches the pipeline to structures such as IBPBP... or IBBP..., improving compression efficiency.
- Higher compression ratio without noticeable quality loss
- Smoother playback in high-motion video scenes
- Reduced bandwidth usage at the same quality level
- Reduces available substreams from 1 main + 3 substreams to 1 main + 2 substreams due to codec resource constraints
- May introduce slightly higher latency (consider for ultra-low latency applications)
Use Case Example: Ideal for streaming sports events, concerts, or surveillance video where image clarity and compression efficiency are critical.
2. Expanded RTMP Push Capacity
What’s New: Single-stream mode now supports up to 3 simultaneous RTMP(S) pushes.
How It Works: The encoder can deliver the main stream directly to three different platforms simultaneously.
- YouTube + Facebook + a third custom RTMP server
- Enterprise streaming solution delivering to both public and internal servers
- Simplifies workflows by removing the need for third-party relay servers
- Expands audience reach across multiple platforms without additional hardware
Use Case Example: Streaming a church service or corporate event to multiple platforms simultaneously, ensuring maximum audience engagement.
3. ICECAST Push URL Support
What’s New: Added direct ICECAST URL support for audio streaming.
How It Works: Users can configure ICECAST server details (URL, port, credentials) to push audio streams directly.
- Enables support for internet radio and pure audio live broadcasts
- Allows integration with existing audio distribution infrastructures
Use Case Example: Community radio stations broadcasting live shows directly over the internet via ICECAST.
Compatibility & Recommendations
Compatible Platforms: Major streaming platforms including YouTube Live, Facebook Live, Twitch, and custom RTMP/ICECAST servers.
Recommended Players: VLC, OBS, and other RTMP/ICECAST-compatible clients.
- Enabling B-frames may increase end-to-end latency slightly
- Users requiring ultra-low latency (e.g., video conferencing) may prefer keeping B-frames disabled
Conclusion
Firmware v2.51A provides a major upgrade to the Ambarella H.265 HDMI encoder, enabling users to:
- Improve compression efficiency with B-frames
- Expand audience reach via multi-platform RTMP streaming
- Leverage ICECAST for professional audio broadcasting
This release represents a significant step toward a more versatile and efficient streaming ecosystem.
Next Steps: Future updates will continue to optimize encoding latency, expand protocol support, and further improve multi-streaming performance.