TFF or BFF & prog to interlaced issues for Blu-Ray

[brassplyer]

Have various progressive video that's either off the internet or been deinterlaced with QTGMC and I want to end up with a 1080 60i Blu-Ray project. I plan to interlace with AviSynth.

First - if I'm starting with progressive video does it matter if I specify TFF or BFF?

Second - if some of the video is 30p and some is 60p and I want to end up with a 60i final result should I make a double framerate version of the 30fps video first?

Do you see any problem with using this AviSynth script? Of course it would be TFF to go with top field first.

AssumeBFF().SeparateFields().SelectEvery(4, 0, 3).Weave()

Is it correct for Blu-Ray you can have 720p 60 but you can't have 1080p 60, only 60i?

Thanks.

[Selur]

Is it correct for Blu-Ray you can have 720p 60 but you can't have 1080p 60, only 60i?

Yes, see pdf from: http://www.blu-raydisc.com/en/Industry/Specifications/PublicSpecs.aspx .

Do you see any problem with using this AviSynth script? Of course it would be TFF to go with top field first.

AssumeBFF().SeparateFields().SelectEvery(4, 0, 3).Weave()

To interlace content from X frames per second to X fields per second: No.

Second - if some of the video is 30p and some is 60p and I want to end up with a 60i final result should I make a double framerate version of the 30fps video first?

Yes.

First - if I'm starting with prog video does it matter if I specify TFF or BFF?

in case 'prog' stands for progressive: No