还有个问题，什么情况下支持软解 4k 呢，我看 smarttube 官方页面，有提到这种情况，但我是连 4k 选项都没有。
>If your device has hardware support for a codec, videos using that codec should play smoothly. High resolutions might also be slow in VP9 on cheap TV boxes that don't officially support 4k. Your device probably can play VP9 videos even without hardware support, however this requires a powerful CPU to run smoothly. Fixing AV01 without hardware support is technically possible, but currently not planned and probably not efficient enough.