• AJA Video Systems

  Great workaround OR bad idea for 525i pull down with 1080 23.98 UC footage?

  Posted by Aaron Goddard on June 6, 2006 at 8:55 pm

  Onlining a film at 23.98 with K2 (D2.5, FCP 5.04, QT 7.1). Used the 1080 23.98psf 10-bit UC easy setup for capture. With this easy setup the 525i downconversion is not available (greyed out). Switched the setup to 1080 29.97 and voila! the 23.98 timeline plays, looks good on the HD Monitors, AND the 525i out works and looks fine on NTSC monitors.

  Is this proper pull down?

  Is it safe to layback masters to D-Beta?

  AG

  Aaron Goddard replied 19 years, 11 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Christopher Tay

  June 7, 2006 at 1:54 pm

  I’ve also noticed the same behaviour that if you switch in the AJA Control Panel to 1080 29.97, select the 525i downconvert and then switch back to 1080 23.98, the downconvert selection will remain at 525i but is now greyed out but it will still spit out a downconverted SD 525i signal and the playback looks fine to me.

  Not sure if this is a hidden feature.

  -chrispy
• 

  Gary Adcock

  June 7, 2006 at 4:08 pm

  [Aaron Goddard] “Onlining a film at 23.98 with K2 (D2.5, FCP 5.04, QT 7.1). Used the 1080 23.98psf 10-bit UC easy setup for capture. With this easy setup the 525i downconversion is not available (greyed out). Switched the setup to 1080 29.97 and voila! the 23.98 timeline plays, looks good on the HD Monitors, AND the 525i out works and looks fine on NTSC monitors.”

  Aaron
  this is correct – the 24p production workflow for everything except HDCAM 24psf assumes that the tape format is really 24p wrapped into a 60 FRAME (720p) or 6O FIELD (1080) SMPTE video stream. All you did was tell the video you needed your 23.98 content to play correctly in a 60 field world.

  Sometimes it’s the simple things that work the best.

  gary adcock
  Studio37
  HD & Film Consultation
  Post and Production Workflows
  Chicago, IL
  gary@studio37.com
• 

  Aaron Goddard

  June 8, 2006 at 8:27 pm

  Beware of the 1-frame video delay. Here is an email response from AJA:

  Setting the video playback to 1080i29.97 and the Kona secondary format to
  525i29.97 is a valid way of downconverting.

  One word of caution: there is a 1-frame delay for video only with
  downconversion; therefore delay the audio on the FCP sequence by 1-frame.
  Some editors are still okay with a 1-frame delay but I thought I should
  mention it.

  Best regards
  Rudy

  Rudy Van Kol
  AJA Video Technical Support

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