EXFO EXpert IPTV Test Tools (FTB-1 / 2 Pro) - Manual (Page 9)

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A.1.1.1 Impact of Packet Loss and Jitter on Video Quality ............................................ 47
A.1.1.2 Impact of Packet Loss on Specific Video Codecs ............................................. 49
A.1.1.3 Playout Buffer Configuration .......................................................................... 50
A.1.2 E NCODING /D ECODING I MPAIRMENTS ..................................................................... 50
A.1.2.1 Impact of Coding Bitrate on Video Quality ...................................................... 51
A.1.2.2 Performance of Video Coders ......................................................................... 53
A.1.2.3 Effective Coding Bitrate ................................................................................. 53
A.1.3 I
MPACT OF
S
UBJECTIVE
F
ACTORS ON
P
ERCEPTUAL
Q
UALITY
.......................................... 54
A.1.3.1 Video Content ............................................................................................... 54
A.1.3.2 Temporal Phenomena: Reaction Time, Masking and Recency Effects .............. 54
A.2 VQ MON /HD Q UALITY A NALYSIS A LGORITHM * ........................................................ 55
A.2.1 V
IDEO
S
TREAM
A
NALYSIS
..................................................................................... 55
A.2.1.1 TR 101 290 Metrics Collection ........................................................................ 56
A.2.1.2 Playout Buffer Emulator ................................................................................ 56
A.2.1.3 Content Analysis ............................................................................................ 56
A.2.1.4 Frame Type Detection .................................................................................... 57
A.2.1.5 Per-frame Quality Analysis .............................................................................. 57
A.2.1.6 Perceptual Quality Model .............................................................................. 57
A.2.1.7 VQmon Markov Model (VMM) ....................................................................... 58
A.2.2 A
UDIO
S
TREAM
A
NALYSIS
..................................................................................... 59
A.2.3 T ELCHEMY V IDEO Q UALITY M ETRICS ...................................................................... 60
A.2.3.1 Mean Opinion Scores (MOS) .......................................................................... 61
A.2.3.2 VQmon/HD Video Service Transmission Quality Metric - VSTQ ....................... 63
A.2.3.3 Degradation Factors ....................................................................................... 64
A.3 IPTV P ROTOCOLS ............................................................................................... 65
A.4 PCR J ITTER ....................................................................................................... 70
A.5 IGMP L
ATENCY VS
. Z
AP TIME
................................................................................ 71
APPENDIX B TECHNICAL SPECIFICATION .............................................................................. 74
TROUBLESHOOTING ............................................................................................................. 77
GLOSSARY ...................................................................................................................... 78