This is a Sandvox YouTube page and I have pasted the video's URL into the Inspector > YouTube > Video: field

I want to compare the video quality between the Vimeo version and this YouTube version. [Update: YouTube will play on an iPhone. Vimeo offers full screen mode, is crisper on text, to my ear has better sound and doesn't have the black 'letter box' bars above and below the video.]

I also want to compare using a YouTube specific Sandvox page, which is this one, and a Rich Text page with the YouTube code embedded. [Update: It's easier to change the video URL in the Inspector than go into Raw HTML, delete the embed code then paste the new embed code if you want to change the YouTube video.]

Initially the QuickTime MP4 encoded MOV file would not play on an iPhone. A day after uploading, the video magically can play on an iPhone. Oh to the technology of patience.