On 2018-07-16 20:55, Daniel Rozsnyó wrote:
I too would have mentioned ffmpeg as the tool to use to avoid a Mac-Windows round trip, had I not been busy when I first saw Geoff's post.
But respectfully, I completely disagree about "approved" or "licensed" products automatically having better encoding quality. Take, for instance, commercial h264 encoders vs open source x264. x264 beats everything else I've ever tested hands down for quality at similar bitrates and can be an order of magnitude faster.
Of the three Prores encoders in ffmpeg, one stands head and shoulders above the others and that is prores_ks, as shown in the example Zach posted.
All lossy encoders generate artifacts, that's a given. ffmpeg's prores_ks encoder just generates different artifacts to the Apple Prores encoder. In my experience, neither stand out as being worse than the others, just different.
Some time ago, I spent some time working on some improvements for the DCP encoder we developed in-house. We started with an open source JPEG2000 encoder which consistently made better pictures than a couple of (incredibly expensive) hardware DCP encoders and our work improved things further. So it's definitely not a case of you get what you pay for :-)
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