Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál stáhnout pdf (Strana 47)

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AppendixA 

TheIPTVVideoStreamissubjectedtomultilevelanalysisasshownhere:

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A.1 UnderstandingIPTVVideoPerceptualQuality*

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TheperceptualqualityofvideotransmittedacrossIPTVnetworksissusceptibleto

degradationfromanumberoftransmissionnetworksourcesi ncluding, frameerrorscaused

bypacketloss,discardofpacketsduetoexcessivedelay/jitter,anddiscardofpacketsdueto

arrivalsequencingerrors.Simplyrelyingonpacketlossstatistics,however,isnotanaccurate

waytomeasurevideoqualityasperceivedbyviewers.Thesa

medegreeofpacketlossmay

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