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| Embedded Video Quality Analysis Technology for IPTV and IP Videoconferencing | ||||
VQmon/HD (formerly VQmon/SA-VM) is an embedded performance monitoring technology that efficiently analyzes multiple parallel packet video streams (RTP or MPEG Transport), and generates real-time perceptual quality scores and a detailed set of diagnostic metrics for each monitored stream. VQmon/HD is compact and efficient, and is specifically designed for integration into network analyzers, IPTV probes, residential gateways, IP set-top boxes, videoconferencing and test equipment. Quality metrics can be produced at the end of each video session or at any point during a session, providing much greater insight than other methods that only report average levels of packet loss/jitter upon session termination. Key advantages of VQmon/HD include:
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Measuring Video Quality Accurately: Why All Packet Loss is not Equal |
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IP video uses a complex frame structure in which some frames are encoded independently (I frames) while others are encoded using information obtained from earlier and/or later reference frames (P and B frames). Encoding errors caused by packet loss may degrade the video quality for up to several seconds or may not be noticeable, depending on which frame types in the Group of Pictures (GoP) are affected. As the figure at right shows, a packet loss impairment affecting an I frame or P frame will be carried over into subsequent frames and may last several seconds, while the same type of impairment in a single B frame will only affect that frame and may not be noticed. Because the same loss rate can lead to wildly varying levels of quality, accurate video quality estimation requires more than just measuring overall packet loss. VQmon/HD detects the GoP structure, identifies I, B, and P frames, and determines the level and impact of packet loss on each frame type. This information allows VQmon/HD to produce estimated perceptual quality (MOS) scores that are significantly more accurate than those obtained from packet loss measurements alone. |
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VQmon/HD provides non-intrusive video monitoring for H.261, H.263, H.263+, MPEG1, MPEG2, MPEG4, VC1, and other key video codecs, with support for both RTP- and MPEG Transport-based streams. VQmon/HD is ideal for monitoring videoconferencing and video streaming sessions, and is small, fast and lightweight, taking a fraction of a MIP to produce a wide range of video transmission performance metrics. VQmon/HD may be used for video monitoring or in conjunction with VQmon/SA for monitoring both voice and video over IP. |
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Metrics reported by VQmon/HD for every video session include: |
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Transport Metrics IP, RTP, MPEG Transport Statistics:
TR 101 290 Decodability Metrics:
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Video Stream Metrics
Perceptual Quality Metrics
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| For more information, see the VQmon/HD Product Brochure or contact us. | ||||
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