Oh no. Firefox is using nearest neighbor chroma upsampling. Literally unusable. I'm going back to Chromium.pic.twitter.com/V1Vxu1Dwnq
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This is nerdsniping me into digging up the code for it, I wonder if they've discussed this. <video>? What platform? Happen to have any guesses where to look?
Linux/Gentoo/amd64/Intel. Here's a test case. First screenshot is ffplay, second is Firefox (both scaled x4). Look at the diagonals in particular. Can't take a Chromium one right now since Chromium crashes when opening it for me now 
https://mrcn.st/t/chromatest_420.mp4 …pic.twitter.com/W7pHi56RLy
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If it's using libswscale, it's probably asking for cheap quality. If shaders/GPU rendering are involved, then it could be more interesting to fix.
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Turns out videos are, in fact, what's crashing my Chromium... https://bugs.chromium.org/p/chromium/issues/detail?id=1095962 …
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Can you go back to chromium if it crashes for you?
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I already found the bug, compiling a patched version... Turns out it was the ffmpeg update and Chromium using it badly.
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so question, how do you scale this video in firefox? Zoom goes only 300% for me
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The scaling was done after the fact. Just play it at 100% and take a screenshot.
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