問題描述
如何通過上傳單個視頻文件為任何 html5 視頻獲得多種質量（360p、480p、720p）選擇 (how can i get multiple quality(360p,480p, 720p) selection for any html5 video with uploading single video file)
我需要一個帶有質量選擇器的視頻播放器，例如 Youtube 或 VK。我只想上傳 1 個視頻，而不是每種質量的多個視頻。並且播放器必須轉換為質量才能點擊質量選項。
有可能嗎？
而 Youtube 或 VK 是如何做到這樣的？
參考解法
方法 1:
When you upload a video to YouTube, it creates lower quality versions of the same video. It ends up with several versions of the same video at different resolutions. So although you only upload once, it stores several versions on disk, which are created at the time of upload.
Here is an ex‑YouTube employee talking about this.
If I were you, I'd see if I could just use YouTube for what you're planning.
(by user4095424、Richard Irons)