i dont want to necrro but for future reerence, i can confirm that with iptvsimple client ver 3.9.8, with kodi ver 18.9, header parameteres are are ignored by ffmpeg but taken into consideration in libbcurl. see below log:
Code:
2020-10-27 23:37:49.177 T:139727801923328 INFO: ffmpeg[7F14E9FFB700]: [hls,applehttp] Opening 'https://manifest.googlevideo.com/api/manifest/hls_playlist/expire/1603859868/ei/PKGYX7H1J8qzgAeZ5r7YCQ/ip/188.194.212.160/id/deKH0pQ7-rg.1/itag/96/source/yt_live_broadcast/requiressl/yes/ratebypass/yes/live/1/goi/160/sgoap/gir%3Dyes%3Bitag%3D140/sgovp/gir%3Dyes%3Bitag%3D137/hls_chunk_host/r1---sn-h0jeenek.googlevideo.com/playlist_duration/30/manifest_duration/30/vprv/1/playlist_type/DVR/mh/Gz/mm/44/mn/sn-h0jeenek/ms/lva/mv/u/mvi/1/pl/24/dover/11/keepalive/yes/beids/23886215/mt/1603837762/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,live,goi,sgoap,sgovp,playlist_duration,manifest_duration,vprv,playlist_type/sig/AOq0QJ8wRQIgBE_JQph58j4KKWzim9UgY-eLppuIS4FniI7Zp1ESATACIQCBkMJP5urNTqZOxjx2UubVoZV_vJ-W8rmECOpRysVpWA%3D%3D/lsparams/hls_chunk_host,mh,mm,mn,ms,mv,mvi,pl/lsig/AG3C_xAwRQIhAMTMh1bHfCrBGQo2TruGirigWeAaJ65ixFe2Tw-dWulpAiBJoP70yvX8Lnjo8oYUl4CjN0uUVVVgUOa66rNu3Qrs5w%3D%3D/playlist/index.m3u8|User-Agent=Mozilla%2F5.0+%28X11%3B+Ubuntu%3B+Linux+x86_64%3B+rv%3A78.0%29+Gecko%2F20100101+Firefox%2F78.0' for reading
2020-10-27 23:37:49.177 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy'
2020-10-27 23:37:49.244 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] request: GET /api/manifest/hls_playlist/expire/1603859868/ei/PKGYX7H1J8qzgAeZ5r7YCQ/ip/188.194.212.160/id/deKH0pQ7-rg.1/itag/96/source/yt_live_broadcast/requiressl/yes/ratebypass/yes/live/1/goi/160/sgoap/gir%3Dyes%3Bitag%3D140/sgovp/gir%3Dyes%3Bitag%3D137/hls_chunk_host/r1---sn-h0jeenek.googlevideo.com/playlist_duration/30/manifest_duration/30/vprv/1/playlist_type/DVR/mh/Gz/mm/44/mn/sn-h0jeenek/ms/lva/mv/u/mvi/1/pl/24/dover/11/keepalive/yes/beids/23886215/mt/1603837762/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,live,goi,sgoap,sgovp,playlist_duration,manifest_duration,vprv,playlist_type/sig/AOq0QJ8wRQIgBE_JQph58j4KKWzim9UgY-eLppuIS4FniI7Zp1ESATACIQCBkMJP5urNTqZOxjx2UubVoZV_vJ-W8rmECOpRysVpWA%3D%3D/lsparams/hls_chunk_host,mh,mm,mn,ms,mv,mvi,pl/lsig/AG3C_xAwRQIhAMTMh1bHfCrBGQo2TruGirigWeAaJ65ixFe2Tw-dWulpAiBJoP70yvX8Lnjo8oYUl4CjN0uUVVVgUOa66rNu3Qrs5w%3D%3D/playlist/index.m3u8|User-Agent=Mozilla%2F5.0+%28X11%3B+Ubuntu%3B+Linux+x86_64%3B+rv%3A78.0%29+Gecko%2F20100101+Firefox%2F78.0 HTTP/1.1
2020-10-27 23:37:49.244 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] User-Agent: Lavf/58.12.100
2020-10-27 23:37:49.244 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] Accept: */*
2020-10-27 23:37:49.244 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] Connection: keep-alive
2020-10-27 23:37:49.244 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] Host: manifest.googlevideo.com
2020-10-27 23:37:49.244 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] Icy-MetaData: 1
2020-10-27 23:37:49.244 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https]
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='HTTP/1.1 200 OK'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] http_code=200
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Content-Type: application/vnd.apple.mpegurl'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Date: Tue, 27 Oct 2020 22:37:49 GMT'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Pragma: no-cache'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Expires: Fri, 01 Jan 1990 00:00:00 GMT'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Cache-Control: no-cache, must-revalidate'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Server: HTTP server (unknown)'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Content-Length: 7039'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='X-XSS-Protection: 0'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='X-Frame-Options: SAMEORIGIN'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header='Alt-Svc: h3-Q050=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-T051=":443"; ma=2592000,h3-T050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"'
2020-10-27 23:37:49.360 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [https] header=''
2020-10-27 23:37:49.361 T:139727801923328 DEBUG: ffmpeg[7F14E9FFB700]: [hls,applehttp] new_program: id=0x0000