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Re: Noise in AJ-HPX 2000P

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Re: Noise in AJ-HPX 2000P
by John LeBlanc on Jan 24, 2009 at 12:57:02 am

I see it in DVC Pro 50 as well as DVC PRO HD 1080i (I haven't tried 720p). It's really weird because the noise definitely breeds in the darker areas of the frame. However, I see it in darks no matter what the color, whether it's green or blue or black.

It's almost as if there are two issues. There is a general grain that is minor compared to the noise in the darker areas.

To my eye, it looks like compression "noise" (although that's not the correct term) along the lines of what you get when you export a QT movie from FCP using QT Conversion, and in some cases in that process you might see gradations of black in the converted file with noise living in some of those gradations. Like on your video's fade outs to pure black and at that moment you see a jump in the compression noise.

I'm guessing this is a camera issue and not a codec issue because it seems to cut across at least two codecs. But why?

Has anyone looked at the recorded MXF files in a program other than FCP, like AVID? I just want to make sure this is not something that QT is doing to the file when it captures it straight from the P2 card into FCP. I don't know if FCP simply wraps a QT wrapper around the MXF or whether it does any further compressing.



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