From 5:4 to 4:3

[Bartoloni]

seems to me a regression because using an old MKVtoolNix (provided with your build of march) the issue is not happening.

P.S. the unflagged interlaced and the PAR 1:1 are coming from the default software of Blackmagic Intensity Pro ( media express ) i think a lot of other users in the world have similar files.

P.P.S.

I checked whether it's tff or bff. tff has fuild motion when bobbed, so it's tff.

this is a nice hint thank you!