So if I have 544x576 interlaced clip, do I do a w3fdif interlace whilst scaling it to 720x576 with the right aspect ratio set and then do a interlace on the deinterlaced file do I have to also to put it back to 25fps when reinterlacing?
There should be no need to deinterlace and reinterlace in this scenario as you aren't doing any vertical scaling, just horizontal.
However you will probably need to persuade ffmpeg to keep the output interlaced. if you use -vcodec libx264 -flags +ildct+ilme that should keep things interlaced.
The only reason to deinterlace is if you are doing a vertical scale. (You can scale in the field rather than frame domain with interlaced content using an interlace aware scale but the quality can be reduced if you do)
However do you want to rescale 544x576 to 720x576 or do you want a square pixel result?
Last edited by noggin on 5 September 2018 11:26pm