Blu-Ray with CBR through Compressor ?

[Mark Spano]

Rafael,

I understand how PsF works. What I’m saying is why bother guessing that Media Encoder *might* translate P into PsF, when you already know that FCP will do it? What if Media Encoder decides to do some interpolation to get there instead of simple duplication? I could test this, for sure, but since you need the intermediate file anyway (coming out of FCP), why not just make that PsF (upper field) and eliminate the variables?

[Rafael Amador]

[Mark Spano] “What I’m saying is why bother guessing that Media Encoder *might* translate P into PsF, when you already know that FCP will do it? “
Could be done in FC, but that will means to lose one generation (rendering), when you just need to read the Prores444 file as Upper instead of Progressive.

Is when we make the H264 that the master neds to be processed as Interlaced instead of Progressive.
Two reasons:
– In a 420 codec, the Chroma is is processed different when the file is Interlaced or progressive.
– The H264 needs to be flagged as Interlaced (Upper first) to match the BR standard.

And is not if Media Encoder “might” translate P in to PSF. Media Encoder will do it. Just set SOURCE: 25fps Progressive, and OUTPUT: 25fps Upper First.
Compressor would do the same.

[Mark Spano] “What if Media Encoder decides to do some interpolation to get there instead of simple duplication? I could test this, for sure, but since you need the intermediate file anyway (coming out of FCP), why not just make that PsF (upper field) and eliminate the variables?”
There is not line interpolation or duplication going on. There is not de-interlacing or re-interlacing.
Is just that the progressive frame (Line 1, 2, 3, 4,..) will be read and streamed sequential:
– Odd lines (Upper field) first, so: Line 1, 3, 5,..
– Even lines (Lower field) after; Lines 2, 4, 6,..
All the lines of your master will be there.
rafael

[Mark Spano]

[Rafael Amador] “Could be done in FC, but that will means to lose one generation (rendering), when you just need to read the Prores444 file as Upper instead of Progressive.”

No generation loss, since there’s no master yet. The export from FCP is creating the master.

[Rafael Amador] “And is not if Media Encoder “might” translate P in to PSF. Media Encoder will do it.”

OK – this was what I was referring to by saying “sure I could test it”. You tested it and it works – I have not since I haven’t had the reason to test. I was just offering a method I knew was accurate and foolproof, without speculating if another workflow would work.

[Rafael Amador]

[Mark Spano] “[Rafael Amador] “Could be done in FC, but that will means to lose one generation (rendering), when you just need to read the Prores444 file as Upper instead of Progressive.”

No generation loss, since there’s no master yet. The export from FCP is creating the master.”
If the footage is progressive, needs to be rendered to be exported as Interlaced.
Only if BEFORE EDITING, the footage is checked as Interlaced in the Browser and edited on an Interlaced sequence won’t need rendering.
Rafael