Q G

Q G Lip Sync

Q G Errors Can Hide Below Threshold  Scenario #1 Show: -1 frame, looks OK Station: -1 frame, looks OK Broadcast Show: -2 frames, looks bad  Solution: All sync must be correct (not just look it) WGBH Public Television Quality Workshop

Q G Errors Can Cancel  Scenario #2 Show: -3 frames Station: +3 frames Broadcast Show: 0 frames, looks good But two wrongs don’t make a right! Good shows will look bad on this station!  Solution: All sync must be correct WGBH Public Television Quality Workshop

Q G Errors Can Drift  Scenario #3 Broadcast Now: Good Broadcast Later: Bad  Solution: Be Careful! Change Channels!  Millions of commercial and consumer MPEG decoders drift! WGBH Public Television Quality Workshop

Q G Error Perception Can Drift  Scenario #4 Sync Now: looks good Same Sync Later: looks bad  Solution: Patience Need tight shots of people talking Some people talk out of sync! Stare at sync long enough, you will start seeing things! WGBH Public Television Quality Workshop

Q G Production Tips  Delay audio with every video delay Framesyncs Switcher effects LCD & Plasma Displays! Don’t trust your ears TEST! WGBH Public Television Quality Workshop

Q G Station Tips  Align sync at every point Framesyncs & processors MPEG & ATSC encoder settings Surprises Don’t trust your ears TEST! WGBH Public Television Quality Workshop

Q G Test Tools  Edit Suites and QC Stations syncheck.com  TV Stations ID with 1 frame dot and beep, then non-linear editor Normal programming with Miranda or Evertz solutions WGBH Public Television Quality Workshop

Q G Consumer Tips  LCD & Plasma TV's Internal decoder should be OK Separate decoder & audio systems require offset!  MPEG decoders Try changing channels WGBH Public Television Quality Workshop

Q G TV Loudness

Q G Industry Progress  Early Confusion  Subsequent Conflict & Loudness Wars  Recent Consensus: ATSC A85! WGBH Public Television Quality Workshop

Q G Production Tips  Buy an LKFS meter (BS.1770) Your mix engineers will like it!  No money? Dialog peaks at -10 dBFS works pretty well  Produce content to -24 LKFS Average over entire show, ± 2 dB Dramatic moments can still be ±10 dB! WGBH Public Television Quality Workshop

Q G Station Tips  Set plant for unity gain  Set encoder dialnorm to -24  Get an LKFS meter (BS.1770)  Measure day-long compliance with -24 LKFS  Apply processing if needed  Compare local stations and share WGBH Public Television Quality Workshop

Q G Tolerance

Q G 5.1 Surround

Q G  PBS Submission Requirement Effective March 2011! Up-mix OR actual 5.1 production Requires Dolby E  Caution Calibrate your LFE monitoring per ATSC A85 Insure downmix is compatible Most stations cannot afford to broadcast 5.1 WGBH Public Television Quality Workshop