I have a source video that apparently has been interlaced a wrong way. The problem is: "ffmpeg -vf yadif=3:0" works perfectly in terms of time axis (results in a smooth motion overall), but it looks like every couple of scanlines are upside down in each frame.
So, I am looking for a way to swap the vertical positioning of top/bottom fields, keeping the temporal order unchanged, before applying a deinterlacer.
Before reaching the above assumption I have tried things like: "-vf 'yadif=3:0,crop=720:480:0:if(mod(n\,2)\,0\,2)'", but that didn't seem particularly helpful.
Any idea? (I am afraid I can't share a sample footage with you.)
