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PowerPoint Presentation - Slide 1 by j26QdXa

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									 What’s Wrong With This Picture?
          (and sound)
     Common Problems with Program Masters
                   Terry Harvey - WSIU
                    Jim Kutzner - PBS
                Tim Mangini - FRONTLINE




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Most Busted:
   Macro-Blocking/Pixilation
   Gamut
   Aspect Ratio
   Drop Frame Time-Code
   Audio Phase
   Synthesized/Fake Stereo
   Loudness
   Audio Dropouts/Hits
   Adjacent Audio Track Sync
   Lip Sync

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Macro-Blocking & Pixelation




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Gamut




 G
            Uncorrected image

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Gamut




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        Hard limited image                       Color corrected image

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Aspect Ratio




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Aspect Ratio




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Non-Drop Frame Time-Code
 NDF program is 3;12 too long
 You or PBS will need to make a cut
 Always Master in Drop Frame


     Doesn’t matter whether you shoot on DF or NDF




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Audio Phase




         Normal Stereo Phase
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Audio Phase




          180° Out of Phase
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Synthesized/Fake Stereo




          6 ms left/right offset
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Synthesized/Fake Stereo




       Synth Stereo Folded to Mono
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Loudness/Dialogue Level




 G
                 Audio starts low


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Loudness/Dial Norm




 G
           Audio gets progressively louder to meet spec


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Loudness/Adjacent Containers




 G
            Program clip meets Dial-Norm spec


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Loudness/Adjacent Containers




 G
              Adjacent promo is too loud


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Audio Dropouts and Hits
 Momentary dropouts can easily be missed
  without good monitoring
 Clicks and pops can be caused by word clock
  errors or cut points on NLE’s




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Adjacent Audio Track Sync
 DVS/SAP/Mono tracks
 5.1 should have only Narration and dialogue in
  the center channel




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Lip Sync
  2 Frames variance is tolerable
 Broadcast distribution chain may induce sync
  errors (MPEG2)




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Sync Drift
   Ingest via Firewire unreliable
     Use RS422
   Longer clips susceptible
     Break up on ingest if possible
     Some cameras are culprits
   Incompatibility with mix
     Add head and tail pops before splitting sequence


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Sync Tool




            www.syncheck.com


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Analysis tools
     Tektronix WVR series                           Videotek VTM series




      www.tek.com                           www.broadcast.harris.com


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Audio analysis tools




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Audio analysis tools
                 Dolby LM100




              www.dolby.com

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Audio analysis tools




           WWW.QUALISAUDIO.COM


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Takeaways
 Plan $$$ and time for tech eval
 Tools - tailor your plant to be able to meet spec
 Know the specs yourself
 Don’t just put it through a legalizer
 Our responsibility to get it right
 Pay me now or pay me later
 Keep your project alive

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Discussion




                                              QG@pbs.org
                                pbsconnect.org/qualitygroup



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