ffmpeg

[ksai.mb]

Hi Sir
i want to download videos from the following site whose credentials iam giving here.

https://superprofs.com/lms/login

username : kvssrk@gmail.com
password: 123456

i am using ffmpeg to download these videos for example
https://superprofs.com/lms/course/309/lecture/16805

i have given the command
ffmpeg -i "https://5318213df0900.streamlock.net/ch/_chinst_/smil:mums3/assets-pvt/q4xRQ-4/videos/10769/2511.smil/chunklist_w308351244_b232000_sleng_tkY2h0b2tlbmR0a W1lPTE1MjYyMDAzNTcmY2h0b2tzdGFydHRpbWU9MTUyNjE4OTI 1NyZjaHRva3VzZXJJZD00NTMwJmNodG9rdmlkZW9JZD0xMDc2O SZjaHRva2hhc2g9X2tpeHpPMlEtUHBZay11c3dmbXdfbnltb1d mcHQxSUdsTjNSZ1VmNWIxdz0=.m3u8" -c copy "sample.mkv"

and iam getting the following error

Error when loading first segment and
Invalid data found when processing input

please suggest me the solution