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Audio For PBS BROADCAST. Lip Sync. Errors Can Hide Below Threshold. WGBH Public Television Quality Workshop. 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). Errors Can Cancel.

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Presentation Transcript
errors can hide below threshold
Errors Can Hide Below Threshold

WGBH Public Television Quality Workshop

  • Scenario #1
    • Show: -1 frame, looks OK
    • Station: -1 frame, looks OK
    • Broadcast Show: -2 frames, looks bad
  • Solution: All sync must becorrect (not just look it)
errors can cancel
Errors Can Cancel

WGBH Public Television Quality Workshop

  • 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 becorrect
errors can drift
Errors Can Drift

WGBH Public Television Quality Workshop

  • Scenario #3
    • Broadcast Now: Good
    • Broadcast Later: Bad
  • Solution: Be Careful! Change Channels!
  • Millions of commercial and consumer MPEG decoders drift!
error perception can drift
Error Perception Can Drift

WGBH Public Television Quality Workshop

  • 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!
production tips
Production Tips

WGBH Public Television Quality Workshop

  • Delay audio with every video delay
    • Framesyncs
    • Switcher effects
    • LCD & Plasma Displays!
    • Don’t trust your ears
    • TEST!
station tips
Station Tips

WGBH Public Television Quality Workshop

  • Align sync at every point
    • Framesyncs & processors
    • MPEG & ATSC encoder settings
    • Surprises
    • Don’t trust your ears
    • TEST!
test tools
Test Tools

WGBH Public Television Quality Workshop

  • 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
consumer tips
Consumer Tips

WGBH Public Television Quality Workshop

  • LCD & Plasma TV's
    • Internal decoder should be OK
    • Separate decoder & audio systems require offset!
  • MPEG decoders
    • Try changing channels
industry progress
Industry Progress
  • Early Confusion
  • Subsequent Conflict & Loudness Wars
  • Recent Consensus: ATSC A85!
    • www.atsc.org/cms/standards/a_85-2009.pdf

WGBH Public Television Quality Workshop

production tips1
Production Tips

WGBH Public Television Quality Workshop

  • 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!
station tips1
Station Tips

WGBH Public Television Quality Workshop

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

5 1 surround1
5.1 Surround
  • 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

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