4K Support in NextGen Live

NextGen Live supports high-quality 4K (Ultra High Definition) streaming with resolutions up to 3840x2160 pixels. This document provides comprehensive information about configuring, streaming and optimizing 4K live streams.

4K streaming delivers exceptional video quality with four times the resolution of standard HD (1080p). NextGen Live's 4K support enables broadcasters to deliver premium viewing experiences for high-end content such as sports, concerts, and premium channels.

After completing this guide, you should be able to:

Understand 4K streaming requirements
Configure 4K live streams using supported protocols
Optimize 4K streams for different viewing scenarios

Audience

Broadcasters and technical teams who need to deliver high-quality 4K live streaming experiences using NextGen Live.

4K Streaming Prerequisites

Other Requirements

4K-capable encoding hardware or software
High-bandwidth internet connection

Supported Input Protocols

NextGen Live supports 4K streaming through multiple input protocols, each with specific codec support:

4K Input Protocol Support
Protocol	Supported Codecs	Description
RTMP	H.264 only	Real-time streaming protocol. Reliable but limited to H.264 codec input.
SRT	H.264 only	Secure Reliable Transport. Supports H.264 codec input. Recommended for 4K streaming.
RTP	H.264 only	Real-time Transport protocol. Fast but limited to H.264 codec input.

Input and Output Codecs

NextGen Live uses H.264 for input and automatically transcodes to HEVC (H.265) for output delivery:

Input: H.264 codec required for all ingest protocols
Output: HEVC codec provides optimal quality and bandwidth efficiency for 4K viewers

Creating a 4K Live Channel

To create a 4K live stream, you'll need to select an appropriate 4K ingest profile during channel creation:

Log in to Studio and open the Live module.
Click Create Channel to create a new live channel.
Enter your Channel Name and configure basic settings.
In the Renditions Profile dropdown, select a 4K profile such as:
- Live UHD 2160 - For 4K Ultra HD streaming
- Live UHD 2160 HDR - For 4K Ultra HD streaming with HDR
- Live UHD 2160 HFR - For 4K Ultra HD streaming with HFR
Complete other channel settings as needed and click Save.

4K Streaming Requirements

Bandwidth Requirements

Input bandwidth: Minimum 20 Mbps, recommended 25+ Mbps for 4K H.264 input
Network stability: Consistent connection without any packet loss

Hardware Requirements

Encoder: Hardware encoder with H.264 support required for input
CPU: High-performance processor for software encoding
Memory: Sufficient RAM for 4K processing

Limitations and Considerations

Bandwidth costs: 4K streaming consumes significantly more bandwidth
Processing overhead: Requires more CPU and memory resources
DRM compatibility: 4K HEVC does not work with Widevine on Google Chrome due to browser limitations

Troubleshooting 4K Streams

Common Issues

Buffering or playback issues

Check viewer's bandwidth and device capabilities
Verify adaptive bitrate ladder includes lower resolutions
Monitor encoder performance and network stability

Poor video quality

Increase input bitrate if bandwidth allows
Verify encoder settings match recommended parameters (see Brightcove Live: Best Practices)
Check for network packet loss or instability

Stream interruptions

Monitor input connection stability
Consider using redundant input streams