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IxLoad – Video Test Solution

Data Sheets

Validate video services to deliver high-quality customer experience

 

Problem: Maintaining Video Quality When Facing Exponential Traffic Increase

 

As more content is offered in high definition (HD) and service providers charge a premium for it, subscribers are likely to churn faster when dissatisfied. Degradation in audio/visual quality experience leads today’s consumer to competitor solutions that offer a better end user experience. With traffic levels high and expected to grow for the foreseeable future, service providers are challenged to assess video quality with real-world traffic loads in pre-deployment testing.

 

Solution: A Comprehensive Test Solution for Video Delivery Platforms

 

IxLoad delivers the industry’s most scalable and flexible solution for realistic load testing of over the top (OTT), video on demand (VoD), IPTV media, and cache platforms to validate end-to-end video delivery architectures. Emulate thousands of interactive on-demand and live streaming user sessions and measure real-time video quality.

 

Key features

 

• Emulates adaptive streaming behavior that dynamically up-shifts or down-shifts the media stream to deterministically play back streams of different quality

• Creates static profiles of user behavior that are fixed on different playback levels to deterministically play back streams of different quality with no network heuristic at play

• Scenario editor defines subscribers’ activities and flexible channel viewing sequence

• Simultaneously supports data, voice, and video protocols to emulate a multiplay subscriber environment with intelligent, real-time issue isolation mechanism

 

Product Capabilities

 

Video quality assessment for IPTV and VoD

 

IxLoad evaluates the performance of video services delivered over an IP network and provides a comprehensive solution for testing IPTV networks, video networks, and other devices that carry video traffic. IxLoad emulates true video on demand (VoD), IPTV subscribers, and video servers sending realtime full-motion video. IxLoad uses network, transport, and perceptual video quality techniques in realtime to measure the impact of delivering video over an IP network.

IxLoad makes video/audio estimations for real-time video streams using the VQmon/HD video quality algorithm. Streams can be sent unicast for video-on-demand applications, or multicast for live TV applications. IxLoad emulates a true set top box (STB) playout buffer to correctly model various environments and provides video quality metrics for all video streams across all emulated subscribers.

The following picture depicts a typical setup of an IPTV or VoD client receiving IP packets, and how the IxLoad IPTV/video client processes the packets and estimates video quality.

The video quality algorithm provides a comprehensive list of metrics. The following reference section details video measurement statistics and how they are used. VQmon/HD reports Relative Mean Opinion Score -Video (MOS-V) and Absolute MOS-V scores. Average scores account for all packets from the start of a stream. Interval scores account for packets since the previous statistic collection.

 

Relative MOS-V is an estimated perceptual quality score that considers the effects of codec/quantization level, the impact of IP impairments (such as packet loss) on the group of pictures (GoP) structure and video content, and the effectiveness of loss concealment methods. It does not consider the image size/resolution, frame rate, or scanning method (interlaced vs. progressive).

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