Best way to put 25p on BluRay?

[GuyB]

Does anyone have a workflow (PC) for working 1080 25 material onto BR?

There are lots of discussions around but nothing much more than chit chat.

From what I have read, with BR not supporting 25p you can, in theory, convert your footage to 24p with a 4% slow down, or convert it to 25psf which makes it 25p stored in a 50i stream.

But my question is, how do you do this? Can it be done without re-rendering? What tools are best for this?

I like the idea of creating a 25psf file but then is this something that will always display properly from all players?

These seem like really muddy waters Sony created excluding 25/30p. Can anyone offer any good reason why they would have done this?

 

[MitchLewis]

According to this site:
http://en.wikipedia.org/wiki/Blu-ray_Disc

Only 50i is supported. Why not go to 50i?

Sorry, just trying to help. I have no first hand experience with this. I burn all blu-ray discs on a Mac using Toast 10. I'm finding out that discs don't work on all blu-ray players. (kinda like back when DVD-R first came out)

 

[moldcad]

Guy,

It's the same old story as with DVD - no 25/30p.

I'm shooting 25p exclusively, and render to 50i for both DVD and BD. Technically, it's 25PsF.

Unfortunately, no way of producing fully compliant BD without at least a single render (although, some authoring system will let you use 25p without re-encoding).

 

[GuyB]

how do you know if you are creating 25psf or if your NLE is doing something less optimal with your rendering though?

 

[moldcad]

how do you know if you are creating 25psf or if your NLE is doing something less optimal with your rendering though?

I know it's 25PsF because the clip still plays the same way the progressive original does - no jaggies, combing or alike (mind you, there is no time offset between the odd and even fields of a given frame, and the only difference is that the 50i clip is flagged as interlaced).

I don't see it as a big problem that in order to make such a subtle "format conversion", the clip needs to be re-encoded; I do it in the final (and usually only) render in Vegas, which I'd need to do anyway after editing and grading.