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If it is 29.97 it's probably telecined as 29.97 isn't standard. It's most likely 24 fps progressive, running at 23.976 fps, and telecined to 29.97 fps. You end up with 3 blended frames and 2 progressive frames. It's got to do with matching the power supply, and using film cameras that were 24 fps. Recording in native 29.97 means it's harder to sell overseas who are on 50 Hz power supplies, but more importantly would require special TV only cameras that would cost for the specialised purpose, and cost 25 percent more for the film due to the higher rate. Best thing to do would be to inverse telecine it and decimate the resulting still frame (fixed cycle of 5).
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