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Color shift when encoding DNxHD QuickTime Video

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Hello

I have been tasked with developing the Editorial submission pipeline for an animated feature film project. Our studio is based on Windows 7 and the Editing team is using Avid Media Composer. We have decided to go with the "fast import" approach for bringing media into Avid. My tools take some frames and encode DNxHD QuickTime videos from them, then we write out an ALE document to assist with the batch importing of the delivery content. We call it the "fast import" approach because Avid only has to change the video container from MOV to MXF and it doesn't have to do any real encoding which is usually the time consuming part.

I have tried comparing DNxHD QuickTime videos encoded using FFmpeg, RVIO and Nuke. The color in each video is different but the only one that matches the video created by importing frames directly into the Avid is the video generated by Nuke. I have heard the color shift may be caused by the way the Apple QuickTime libraries manage color on the Windows platform, is this true? If so, how is Nuke able to produce the correct output? Also, is there any way I can produce the correct output using FFmpeg or RVIO?

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