Green render line after conforming sequence to clip

i've just cut a clip into a new timeline.
as i was doing it, i was asked if i wanted to match the sequence to the clip,
i said YES,
but now the clip has a green render line!

i'm cross-checking all the relevant properties i can think of in the browser columns

anyone know what might cause a green render bar, when everything seems to match???


my clips properties are ProRes4444 25p
the clips were created by batch exporting "subclips" from a 10bit source.

another clue:
when i change my sequence from "render in 10bit YUV" to "render in 8bit YUV", or "render in RGB"
the render line changes from green to the blue/grey of "full"


nick

more clues

initial capture was PR4444.
that was to hard for the CPU, resulting in too many dropped frames,
so recaptured as 10-bitRGB

i can't work with the Uncompressed, so am trying to transcode to 4444

i tried exporting some of the captured PR4444 shots as PR4444 to see what happened.

now, these 4444 captures sit in a timeline just fine,
but if i export them there are issues:
Batch Exported files get the green line in a timeline,
a MANUAL export reveals something odd: i don't get the "item settings" option in the export window,
i get the Apple Intermediate option as the default,
I've seen that when the clip you want to export is non-standard.

so why can't i export ProRes4444 25p from FCP??



nick

it was the alpha channel!

My first thought was, the extra load is coming from the alpha channel support in that codec. But the 10-bit YUV is another anvil on your CPU-- it increases the load exponentially-- I've seen my own 2009 8-core machine choke on 10-bit-- even single stream! I've seen an FCP outfit in online suite also choke 10-bit. So moving back to friendly old 8-bit seems the order of the day.

Can you get away with it imagewise? For keying? That's another question.

We may not have such problems with a new MacPro.

Best, as always,
Loren S. Miller
www.neotrondesign.com
Home of KeyGuide Central

well, once i turned the alpha to none/ignore within FCP, the render line went away.
the files would still import with the alpha.

i was doing a lot of re-preocessing, anyway, in fcp, and in motion,
so we always exported as 4444 but with the advanced setting of millions of colours, not millions+
which stripped the alpha.
exporting out of FCP, i had to check "recompress all frames" for this to take.

the story is that this was a re-construcution of an old film.
16mm telecined to HDCam SR,
then captured as 4444.
the colourist preferred 4444 to 422, and we had the drive space & speed to handle it no worries, so that is what we did.


nick