can not combine .m3u8 video segments

[nanfei01055]

I downloaded the .m3u8 file and video segments, I want to combine the segments to a .mp4 video, but I got an exception: "System.Net.Http.HttpRequestException: The requested address is not valid in this context".

I am not sure what is wrong, here is the code and part of .m3u8 content, can you help me?

code :
var cmdParams = "-y -allowed_extensions ALL -protocol_whitelist "file,http,crypto,tcp" -i "/storage/emulated/0/MyBrowser/2e37c5c3526f5c560dc0092fe762f807/index.m3u8" -c copy "/storage/emulated/0/MyBrowser/b1cb7094-f590-403c-9397-d1d6af32f46b.mp4"";

await FFMpeg.Xamarin.FFMpegLibrary.Run(this, cmdParams, (s) =>
{
System.Diagnostics.Debug.WriteLine(s);
});

index.m3u8 content:
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:11
#EXTINF:6.000000,
/storage/emulated/0/MyBrowser/Cache/2e37c5c3526f5c560dc0092fe762f807/segment_0.ts
#EXTINF:10.133333,
/storage/emulated/0/MyBrowser/Cache/2e37c5c3526f5c560dc0092fe762f807/segment_1.ts
#EXTINF:1.466667,
/storage/emulated/0/MyBrowser/Cache/2e37c5c3526f5c560dc0092fe762f807/segment_2.ts
#EXTINF:4.333333,
/storage/emulated/0/MyBrowser/Cache/2e37c5c3526f5c560dc0092fe762f807/segment_3.ts
#EXTINF:10.366667,
/storage/emulated/0/MyBrowser/Cache/2e37c5c3526f5c560dc0092fe762f807/segment_4.ts
...