Nearly all the other competitors are in development and unusable because of their really slow encoding time. I do keep an eye on encoders, and while it is good to know the work going on this field, practically speaking nearly everyone is moving on to HEVC. Personally, even I've started re-encoding my video library with HEVC, once I discovered that the "medium" setting takes about the same time as H.264 encoding and gives an acceptable quality for (sometimes) half the file size. It's rare to come across any VP9 videos, and HEVC is undoubtedly number 2. I wouldn't call it grain, it's more like that your source comes from a grainy original encoded at a lowish bitrate - just look at the dark flat areas near the top of the first image. Nevertheless, the source is very difficult. If you look at the torrent scene, most of the popular tv series and movies are now also available HEVC encoded and they are popular too (especially the high quality 2k and 4k Blu Ray rips). If you use x265 for any real work, you should use at least -preset slow as the base, I personally use -preset slower. When it comes to the popularity of video encoders, my unscientific way of judging it is to look at what the pirates are using. But recently, with the advent and demand of 2k and 4k videos, people realised the need of, and have started appreciating the capabilities of HEVC. Sure, because it is "good enough" for what it does. instead h264 remains the undisputed king Forget commercial softwares, even the popular open-source video encoders like Handbrake or AviDemux or FFMpeg do not have AV1 or any other competing encoders in.
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