How to make m3u8/ts files smaller?

[Michota]

I want to compress mp4 to m3u8, but make its size smaller too.
For this moment I use

`-i ${inputUri} -c:v copy -c:a copy -b:a 128k -force_key_frames expr:gte(t,n_forced*${hlsTime}) -f hls -hls_time ${hlsTime} -hls_list_size ${hlsListSize} ${outputUri}`

but the size is the same as input uri.

I wanted to use libx265 as they recommended in that post, but i get an error when i run this command

-i ${inputUri} -c:v x265 -c:a copy -b:a 128k -force_key_frames expr:gte(t,n_forced*${hlsTime}) -f hls -hls_time ${hlsTime} -hls_list_size ${hlsListSize} ${outputUri}`;

Error: Unknown encoder 'x265'.

I had video package installed before

/// app.json
      [
        "@config-plugins/ffmpeg-kit-react-native",
        {
          "package": "min-gpl"
        }
      ]

but even after i changed it, removed app from my device, and reinstalled it, its still saying that it is unknown encoder...
I use Expo SDK51.

Help me, please!