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FinalCut Pro RGB 4:4:4 not matching 4:2:2
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Check the Sheer video codec for proper Y’CbCr – RGB conversion.
https://www.bitjazz.com/en/products/sheervideo/
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Product Manager
MXF4mac
https://mxf4mac.com -
well, since I’m deliverign to other posthouses in town I would like to use a “standard” codec that works in FCP without the need to buy extra stuff.
Actualy, I’m not converting YUV > RGB.
i’m ingesting RGB from a HDSR into FCP and would like to save it in a QuickTime with a RGB-codec./carl
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Hi Gary,
Is a fact that there are colors that can not be translated from one color space to the other so losses will always happens. Is also possible that other application can minimize this loose by applying some kind of filtering or so (somebody have mentioned here Sheer, that use his own algorithm).
Yes, I haven’t express my self properly when I said that all the RGB is always 444. I was referring to the fact that in RGB the three components must to go together. We can not take the (ie) Red from one pixel and mix it with the G and B of the third pixel to the left. Carl understood quite well what I had in mind.
And I guess Mr Poynton don’t knows everything, but so far is the best I found after a lot of searching in internet.
BTW, FC can not render RGB in other than 8b, but there is no problem to cut 10b RGB in FC. As long as you don’t render or export with “Recompress all frames” ON, FC will export as 10b RGB.
Rafael -
hey guys
If any of you are currently using RGB (QT) material in FCP… how did you get it in?
The Presets that came with FCP / Kona3 didn’t include a 10bit RGB-setting.
What I did was: I took the “uncompressed 10bit 4:2:2” and duplicated it, changed the
codec to “AJA 10 RGB”… is that they way to do it?/carl
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That’s the way Carl. Just change the codec and make sure that the fields order is the same of your footage.
For cutting and exporting without rendering FC will do the job.
Rafael -
[Carl Skaff] ”
Actualy, I’m not converting YUV > RGB.
i’m ingesting RGB from a HDSR into FCP and would like to save it in a QuickTime with a RGB-codec.”Carl, I think the solution is to capture and deliver the AJA RGB codec. AJA provides this codec free for Mac and Windows on their web site. Whoever your delivering to should be able to accept this.
EDIT: I forgot the original dilemma. Sorry. Honestly, I think you should call AJA and ask them why there’s no Easy Setup for 1080i50 RGB. It’s possible the RGB codec wasn’t designed for this frame rate. All I know is that the AJA RGB codec does a lot of strange things in order to work around the QT 8-bit RGB limit.
Sean
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[Rafael Amador] “Is a fact that there are colors that can not be translated from one color space to the other so losses will always happens. Is also possible that other application can minimize this loose by applying some kind of filtering or so “
Who is disputing that? Not me, but the issue facing Carl has nothing to do with that issue according to his post, I went back and read it again to make sure.
Without proper monitoring in a corrected dual link display you never see the file as anything other than YUV? Not on a computer monitor since they cannot be calibrated to SMPTE standards.I factually stated that this is not an issue on multiple NLE’s, as it is an issue of how and where the data points are converted or managed during the conversion and how poorly the math in the conversions are done in the QT universe. A vast amount of the issue has to do with truncation and rounding errors in the conversion matrices, I do my RGB > YUV in hardware rather than in software for greater accuracy. and I do this in 4:4:4 on a weekly basis, from a variety of sources, from Log and Linear sources as both RGB and YUV.
“Yes, I haven’t express my self properly when I said that all the RGB is always 444”
But accuracy is important, especially when trying to hold a technical discussion at a high level.
It is about spreading information not misinformation
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows -
[Sean ONeil] “I think you should call AJA and ask them why there’s no Easy Setup for 1080i50 RGB. It’s possible the RGB codec wasn’t designed for this frame rate.”
thats the real way to go right there.
I don’t think it has anything to do with being designed for a frame rate though.
For whatever reason Apple/blackmagic/aja have all been weird when it comes to offering
25P/50i HD easy setups for PAL work which seems kinda strange. -
[gary adcock] “But accuracy is important especially when trying to hold a technical discussion at a high level. It is about spreading information not misinformation “
I absolutely agree. We should start by no using the term “444”. This belong to down-sampled or compressed formats where 4 pixels blocks are used. We should say “Full RGB 8/10b” or “Full YUV 8/10b”. But the industry had adopted “444” because is easy to understand.
I don’t pretend to hold a technical discussion at high level. I recognize my lack of knowledge about many technicals question. I’m limited to learning through internet and through the other’s experience (in the COW for example) and quite often is difficult for me to put together so much contradictory information that I find. I appreciate when somebody corrects me.
My English is another limitation when I try to express my self, not only when I try to talk about technical question, but also (and this I regret it the most) when I would like to put a bit of humor or “easy going” feeling in my posts. I know that some times can sound dry or harsh. That’s never my intention.
Cheers,
Rafael -
Carl,
For just few bucks “Sheer” offer may advantages, starting by generating files a 40% smaller than the similar Apple codecs. There is a free reader, so your customers don’t need spend any money. Is cross-platform so you don’t exclude the PC people from your circle.
You have all the flavors: 422/444, YUV/RGB, 8/10 Unc and always with Alpha Channel available. And it have his own algorithm when going fro RGB to YUV or back.
Even you are not interested in buying it, their web site deserve a visit. A lot of information about codecs.
Cheers,
rafael
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