• Blackmagic Design

  NTSC 23.976 – 29.97 fields reversed 5.2.2

  Posted by Richard Needham on November 21, 2005 at 11:17 pm

  I have 23.976p 720×486 footage I am outputting from AE6.5. When I play it back in PPro 1.5.1 in a BMD NTSC 8bit 23.976 16×9 preset the fields are reversed. This same procedure with HD footage(23.976 – 29.97) works fine.

  Is this a driver problem or I’m I doing something wrong?

  DecklinkHD
  5.2.2

  V-IV

  Richard Needham replied 20 years, 5 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Andrew Mcleod

  November 22, 2005 at 12:47 am

  When rendering out from After Effect in NTSC – Render settings > Time Sampling > Field Render > Lower Field First. By default the Field Order is off – assuming Progressive Material ( Animation ).

  NTSC Uncompressed and DV NTSC AND PAL are Lower field First.
  PAL Uncompressed are Upper Field first.
  All HD format are Upper Field First.

  Andrew McLeod
  Blackmagic Design
• 

  Richard Needham

  November 22, 2005 at 2:34 pm

  Have you really tried this? I have, and no setting seems to help in AE 8bit NTSC (for HD, encoding with Off or Upper Field works fine). In a 16bit NTSC AE project, when rendering out using the BMD 10bit 4:2:2 codec field order is fine. The same progressive NTSC file sequence rendered on a PPro timeline in the NTSC 8bit 23.976 BMD preset is also fine. There seems to be something wrong with the Uncompressed 8bit AVI codec. Curiously, the same 240 frames rendered in AE 8bit uncompressed (240MB) is larger than the 10bit BMD codec (213MB). From a 8bit BMD PPro timeline the same 240 frames is 160MB. Has there ever been a time where you could select a BMD NTSC 8bit 4:2:2 codec for rendering in AE?

  V-IV

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