Hi.
So, I did contact Crescendo asking if I could help him rendering a
transparent h265 1080p version (using the
slower x265 preset with some extra placebo, and multiple passes); he kindly provided near-lossless source and now here we are
https://mega.nz/#!7rQB2C6R!aUJwUrLo--kt ... 1Ty_alb1j0
Some infos: even if this file is
half the size of the 1280x720 h264 MP4 currently listed in OP, it retains higher quality along with a higher resolution – according to various metrics; last but not the least, the synthetic VMAF score tells me
I'll skip various gory and boring details here, anyway: if you see artefacts, they were in the sources I was given (some of the original vids weren't in 1080p to start with)
Since the sources were really diverse probably the bitrate could have been allowed to wander way more freely: so, I scheduled a peculiar third pass encode which should shrink the file down to ~350MB, with possibly visible but really minimal losses (no ETA)
As usual, please import in your mega before downloading.
And thanks to Crescendo for his amazing work.