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Dual Link Conundrum
I’m posting this both on Sony and Avid’s forum as the problem lies somewhere between the two.
We captured a tape from our Sony 5500 into our Avid Nitris DX in RGB 4:4:4 1:1 via dual link. That part went flawlessly.
Now we want to output. I looked for a way to downconvert the output to 4:2:2 but can’t find one.
So we decided to output via dual link. When we connected the output of the Nitris DX to the SRW5500 inputs the result goes purple. To verify the connections, I connected the DX Box directly to a BVM230 monitor and it looks great.
I connected the Nitris DX to an AJA 3GM converter to see if we could take a 4:2:2 down convert from it’s monitor output but I get the same purple screen.
Anyone have any suggestions?
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3 Replies
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Sounds like the SR machine is expecting YCbCr and you are feeding it RGB. Also, if the project is 4:4:4 RGB that might explain why you can’t go to 4:2:2 output, because that would be YCbCr.
Bram Desmet
FSI (Flanders Scientific, Inc.)
http://www.FlandersScientific.com -
The 5500 System setting is:
23.98psf 1080 4:4:4 Auto
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Keep in mind that Payload ID is not generated/passed/read by some I/O and converter interfaces. If any equipment along the line is not passing Payload ID you may require manual settings so that all the equipment in the line knows to look for the appropriate format (4:4:4 or 4:2:2, YCbCr or RGB). Your indication that everything has a purple cast is why I’m fairly confident this is the issue. 4:4:4 RGB fed to something expecting 4:2:2 YCbCr typically results in a severe purple cast to the image. Without Payload ID present it would be difficult for the receiving equipment to know whether the signal is YCbCr or RGB.
Bram Desmet
FSI (Flanders Scientific, Inc.)
http://www.FlandersScientific.com
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