50i-to-50p (or 60i-to-60p) double deinterlacing:
A 50i video can be deinterlaced to either 25p or 50p. A 25p deinterlace is an approximation of an originally shot (with too short shutter time) 25p video and a 50p deinterlace is an approximation of an originally shot 50p video. Naturally the approximations fall short of the goals because in each of them half the lines are constructions. Using complex deinterlacers the constructions can be very good. For each high quality deinterlacer the approximation to the 50p goal will be just as good as the approximation to the 25p goal. The 50p goal contains more information than the 25p goal. More of the 50i information is preserved in the 50p deinterlace than in the 25p deinterlace. Whether that extra information can be of use in the final output depends on the case at hand.
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A 50i video can be deinterlaced to either 25p or 50p. A 25p deinterlace is an approximation of an originally shot (with too short shutter time) 25p video and a 50p deinterlace is an approximation of an originally shot 50p video. Naturally the approximations fall short of the goals because in each of them half the lines are constructions. Using complex deinterlacers the constructions can be very good. For each high quality deinterlacer the approximation to the 50p goal will be just as good as the approximation to the 25p goal. The 50p goal contains more information than the 25p goal. More of the 50i information is preserved in the 50p deinterlace than in the 25p deinterlace. Whether that extra information can be of use in the final output depends on the case at hand.
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