Guarantees

1. No stupid commentaries ever.
2. All videos should be available in "VP9" codec, ensuring better image quality over "H.264/AVC" in KZread. (It is mandatory for KZread viewers to use VP9-supporting browers.)
3. All videos should be available up to "1440p", "1440p48", or "1440p60" for now, and up to higher resolution later.
4. All audios should be available in Opus codec, the best audio codec in KZread. (It is mandatory for KZread viewers to use Opus-supporting browsers. )