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Hardware question : which Graphics card should I choose？

Right now i use ProRes444 with alpha channel. I’ve tried the quicktime animation encode, but the opacity gradient did’t work well. it was like play an 8bit video on a 10bit screen. As the crawler you said, I just use a js searched on the internet , I uploaded it to google drive , you can download it here if you like, I’ve change the comments of the js file into English.