I'm pretty sure I understand this but wanted to confirm my understanding about ProRes codecs.
In the past I've had some issues with mixing Avid DNxHD 8 bit and DNxHD 10 bit. There were no problems in Avid but it would create potential conflict when exporting QT Ref files. Those files would play nice in QT and seemed to work for networks but when I ama linked back to them it was like whatever the first media in the QT ref file was bit depth wise became the only bit depth the ama would play back. Even after the QT ref was baked into a self contained file. Again the network never had a problem by when I ama linked the master files back in Avid to check I saw the issue.
In my current project I've been posting about I transcoded Camera original AVC-Intra from Panasonic Varicam 35 to ProResHQ. The original files are 422 YUV 10 bit Vlog. To me ProResHQ is fine for that. There is one camera that was shot on a Sony A7. That camera media came from the field as a merged file that is ProRes422. An accompanying report file indicates "CD ProRes & DNxHD Transfer Tool 3.0.0" was used to create the merge file. After some googling it appears this is software from Convergent Design. I'm not sure if it is stand alone or if it works in conjunction with one of CD's hardware recording tools like the Odyssey or Apollo units. I've reached out to the DIT for clarification.
It seems the merged file has the Sony Slog2 LUT baked in. I was supplied with an SLog2 LUT from the field but the footage looks fine straight but gets messed up if I add the Slog2 LUT. Hence I assume the "CD ProRes & DNxHD Transfer Tool 3.0.0" process baked in the LUT. More will be revealed when I hear back from the DIT.
So my understanding of the ProRes codecs is that they differ from Avid DNX in that they can handle any bit depth or resolution. ProRes 4444 handles alphas that the others don't but that is not a concern for my current needs. So my question is if I just consolidate the merged files to keep them ProRes422 instead of trancoding to ProResHQ could I introduce any under the hood issues like mixing DNX 8 bit and 10 bit did. My understanding is ProRes codecs are all 10 bit even if the source is 8 bit but perhaps I don't understand that completely. My gut say it's cleaner to consolidate and not add an unnecessary transcode and it will certainly save some disk space as these are long one hour and twenty minute clips.
Anybody got any insight into this? I'm not having any issues but trying to learn more about file structures etc...
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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