10.08.2021, 05:56
It is not a simply wrong flagged video. DVDs just can't be progressive by specification, so it was a common trick (used in last years of DVDs i guess) to fit better quality progressive content inside interlaced DVD. If look really deep under magnification it is possible to see very tiny near invisible unusual interlaced artifacts in some local places that still need some tiny amount of filtering or deinterlacing.
So for those types videos i experiment with Input type: Interlaced, and use QTGMC with top or bottom field first. There is a little side effect of usind QTGMC like this. It may produce new artifacts because QTGMC may detect some fine patterns as interlaced fields, but in reality they are simply real life details.
So there is also another probably better way to deal with this footage - Instead of QTGMC, set input type to Progressive and use AntiAliasing filter before Resize to remove those tiny jagged/interlaced artifacts.
By the way, i guess similar trick sometimes used in BluRays. It named "fake interlace" or something like this. Progressive content flagged as interlaced to fit 1920x1080 high framerate videos to BluRay specification.
So for those types videos i experiment with Input type: Interlaced, and use QTGMC with top or bottom field first. There is a little side effect of usind QTGMC like this. It may produce new artifacts because QTGMC may detect some fine patterns as interlaced fields, but in reality they are simply real life details.
So there is also another probably better way to deal with this footage - Instead of QTGMC, set input type to Progressive and use AntiAliasing filter before Resize to remove those tiny jagged/interlaced artifacts.
By the way, i guess similar trick sometimes used in BluRays. It named "fake interlace" or something like this. Progressive content flagged as interlaced to fit 1920x1080 high framerate videos to BluRay specification.