How to get big facebook video thumbnail

Question

I\'m looking for the way to get big facebook video thumbnail. i\'ve found some links:

http://graph.facebook.com/1571886379501082/picture ~> this one retun one small thum

Answer 1

When the first URL is hit, the link is refering to

https://fbcdn-vthumb-a.akamaihd.net/hvthumb-ak-xfa1/v/t15.0-10/p128x128/10876207_805883852835396_1769147834_n.jpg?oh=a755047c692902070f8d9bd79ce28453&oe=56396042&gda=1451498989_6c4cbd42045490d0935990d6627905ed

For large thumbnail you have to change the size 128x128 to 552x414

https://fbcdn-vthumb-a.akamaihd.net/hvthumb-ak-xfa1/v/t15.0-10/s552x414/10876207_805883852835396_1769147834_n.jpg?oh=09f92535e931ff2269a7ae4d31c03d5b&oe=563FEF44&gda=1451103467_d60d0b95c7e93f9c9046a0eeeca24c5e

Kindly figure out with regular expression or something else for proper usage but the above URL works for me.