i'll try to explain again;

location /videos/ {
/*secure link module codes */
mp4;
} //secure link and mp4 streaming & seeking works well

location /videos/ {
/*secure link module codes */
mp4;
flv;
} //secure links works. mp4 streaming & seeking doesnt works as should be.

location /videos/ {
/*secure link module codes */
location ~ \.mp4$ {
mp4;
}
} //secure link doesn't works, mp4 streaming & seeking works.



location /videos/ {
/*secure link module codes */
mp4;
location ~ \.flv$ {
flv;
}
} //secure link works on mp4 extension, but doesn't works on flv. streamings & seekings works well.



location /videos/ {
/*secure link module codes */
location ~ \.mp4$ {
mp4;
}
location ~ \.flv$ {
flv;
}
} //secure link doesn't works on flv and mp4. streamings & seekings works well.