Tektronix's Sentry digital content monitor now allows identification and diagnosis of video and audio quality issues in live and on-demand services delivered using adaptive streaming.The Sentry performs Perceptual Video Quality (PVQ) analysis on video streams encoded in the H.264 codec used for adaptive streaming, which enables it to identify video artifacts stemming from over-compression. Such over-compression artifacts are virtually undetectable by simply looking for packet loss.In an adaptive streaming monitoring application, Sentry examines H.264 video streams immediately after they have been transcoded from MPEG-2 and just prior to fragmentation and encryption. Simultaneously, it examines the accompanying audio programs encoded in the AAC codec.Tektronix will demonstrate the Sentry at Cable-Tec Expo next month in Atlanta.