I've posted on this topic in the past. I've read the Avid's DNX HD Codec is different than most if not all other codecs in that it has a flag for Legal vs Full Range video essence level. In the old Avid's it's termed 601/709 vs. RGB. Not current Avid's use the Legal and Full Range terms. No matter what it's called I still get issues when processing in Adobe Media Encoder with Avid exported QT Ref files.
If I use Adobe Media Encoder to bake XDCam50, H264 or ProRes files from an Avid DNX_175X QT Ref file I have to check the box in the export dialogue to RGB or Legal to Full Range depending on which version of Avid I'm running. This will make files that are correct legal level video essence. If I instead say stay at legal levels or 601/709 I end up with files with scaled down video essence levels.
If I use Adobe Media Encoder to do the same thing but bake out to a DNX codec the resulting file reflects the export level setting I choose. So using Full Range Exports that I have to use for the above mention files results in a Full Range DNX file. The fix is to export as legal level when I'm baking DNX files with AME.
I have just accepted this is how I have to work but I'm pretty sure under the hood there is some metadata flag that may be carrying through to the final files that could lead to a mis interpretation of levels by some software. I haven't had any complaints on my delivery files but I'm curious if anyone has insight into the reason behind this. It's as if AME wants things to be Full Range Level except when it comes to DNX codecs. Anybody got a suggestion about what's going on?
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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