Retrieve what video resolutions(quality) a youtube video has, with youtube api or packet analysis

a youtube video is usually with multiple video resolutions (quality) like 240p, 360p,720p,etc how can I retrieve what video resolutions(quality) a youtube video has are there any youtube api which can get this information
I think If I capture the packets when I'm watching a video, by analysing the packets, definitely I can know what resolution this video provides but I don't know which part the packet provide this information does anyone know this? thanks!

I am no iPhone expert, but I believe it has to do with what connection you are using.
I noticed this the other day, I watched a YouTube vid the other day connected to my home wifi, and it looked amazing. Then I went to show a co-worker the same vid while on the 3g network. It looked like crap, all large pixels and blury. Anyway that is what I noticed.

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