How to get images for a youtube video of all size for a youtube channel? -

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i want of different images youtube stores of videos channel guitar3covers

for video https://www.youtube.com/watch?v=i03uuxgpwd8 video id is: "i03uuxgpwd8". can same image both http://img.youtube.com/vi/i03uuxgpwd8/0.jpg , http://img.youtube.com/vi/i03uuxgpwd8/hqdefault.jpg. want images stored youtube.

there 4 different images why getting same image. various sizes of 0.jpg, except 1.jpg, 2.jpg , 3.jpg screen caps different stages of video.

for reference, youtube stores 9 thumbnails each video:

http://img.youtube.com/vi/i03uuxgpwd8/0.jpg (480x360px) http://img.youtube.com/vi/i03uuxgpwd8/1.jpg (120x90px) http://img.youtube.com/vi/i03uuxgpwd8/2.jpg (120x90px) http://img.youtube.com/vi/i03uuxgpwd8/3.jpg (120x90px) http://img.youtube.com/vi/i03uuxgpwd8/maxresdefault.jpg (1920x1080px) http://img.youtube.com/vi/i03uuxgpwd8/sddefault.jpg (640x480px) http://img.youtube.com/vi/i03uuxgpwd8/hqdefault.jpg (480x360px) http://img.youtube.com/vi/i03uuxgpwd8/mqdefault.jpg (320x180px) http://img.youtube.com/vi/i03uuxgpwd8/default.jpg (120x90px)

just replace video id (i03uuxgpwd8) each video. note if video quality less quality of thumbnail, youtube not store image size, may need check nulls.


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