>BD 1920x1080 HEVC-yuv444p10 This, at best, is bloat, and at worst, reduces quality for viewers. I'm going to explain why. The source of this is YUV420. This means that we have a full 1920x1080 luma (brightness) plane, but two half-resolution chroma (colour) planes. If we play back a YUV420 file in a video player, it will use a scaling filter of its choice to scale the chroma to the screen's resolution, and output it to our RGB screens. What you do when you upscale the source's chroma to the resolution of the source's luma plane to get that stupid "yuv444" in your title, you're essentially applying a scaling filter before encoding, which means not only that the codec now has to encode more data, but also that the player will not use its own scaling filter, but instead gets whatever you chose (probably something shit like bicubic or bilinear) plus encoding artefacts on top. It's extremely unlikely any filtering that has been done to the source's chroma planes will add anything worth keeping in the doubled resolution. You've probably just made it look worse, and most certainly at a larger filesize, for no point whatsoever other than buzzwords.

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