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Field Issues in QT movies from Ki Pro
I am using a Ki Pro running V3 software to make QT movies in ProRes 422 from old Beta SP tapes. I am using a Sony A500 VTR to play the SP tapes via the SDI output. When I look back at the .mov files in Quick Time there seems to be a field dominance issue where any movement in the shot has jagged edges as if the fields are reversed. Using QT Pro I can de-interlace the video and this cleans up the the edges but i would really like to know where the error originated. any help much appreciated.
Cheers Phil.
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2 Replies
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It is quite likely that your footage does not have any issue. Using desktop software tools to evaluate video interlacing isn’t always the most reliable method since software applications may only display a field at a time for preview on the computer desktop. If the footage appears correct on a video CRT monitor (which natively supports interlaced material), then the footage is likely fine. Additionally, you can verify field dominance in an application such as Final Cut Pro 7 via the Edit>Item Properties>Format selection. Review what is reported in the Format tab, Field Dominance. SD NTSC should have a field dominance reported of Lower (Even) and SD PAL should have a field dominance reported of Upper (Odd).
If you have additional questions or concerns, please feel free to contact AJA Technical Support via phone or email, Monday through Friday, between 9am and 5pm PST.
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AJA Video Systems
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thats very helpful. Many thanks.
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