Re: [Avid-L2] Lavc57.24.102 netflixprores 3840_2160 What is this codec that I can ama but not transcode or consolidate?

In a practical sense, any transcode will change the file.  The change
may be minuscule but it will almost never be for the better. In a
theoretical sense, if the file is decoded to an uncompressed state,
using the reverse of same math that was used to encode it originally,
and then that uncompressed file was re-encoded using the same math that
was used to encode it originally, the result should be identical to the
first encode.  The math that goes on in most codecs is scary complicated
so the odds of that happening in the real world are small.  On the plus
side, assuming that Prores is truly an intraframe codec, the math is
much simpler.
--J.B.

John Moore wrote:
> So given I took a ProResHQ file into Adobe Media Encoder to spit out
> an identical but properly branded or signed or whatever the proper
> term is that makes Avid not see this ProResHQ file not as foreign
> compression it is theoretically possible that it could be no loss, it
> sounds like this is unlikely to be the way AME is coded.  So basically
> I'm asking when going from ProResHQ to ProResHQ does AME rewrap or
> transcode.  Since there is no change in the codec other than whatever
> metadata makes it a "blessed" proreshq in the eyes of Avid I'm
> wondering is there a chance it's a lossless process?
>




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