streamlink with -o switch or pipe output to ffmpeg.
Code:
C:\>streamlink https://rakip9.tv/watch/bizim-koyun-sarkisi.html?key=04521cf481574907692280881e73cc14 best -o file.mp4
[cli][info] Found matching plugin generic for URL https://rakip9.tv/watch/bizim-koyun-sarkisi.html?key=04521cf481574907692280881e73cc14
[plugins.generic][info] Version 2021-06-16 - https://github.com/back-to/generic
[plugins.generic][info] 1. URL=https://rakip9.tv/watch/bizim-koyun-sarkisi.html?key=04521cf481574907692280881e73cc14
[plugins.generic][info] 2. URL=https://flowcdn.nl/embed-6iqg1ctvoark.html
[plugins.generic][info] Found Playlists: 1 (valid)
[cli][info] Available streams: 1076p (worst, best)
[cli][info] Opening stream: 1076p (hls)
[download][file.mp4] Written 12.0 MB (10s @ 1.0 MB/s)