package transcoder

import (
	"os/exec"
	"os"
	"io"
)

func NewTranscoder(stream_key string) (io.WriteCloser, error) {
	base_dir, _ := os.UserHomeDir()
	command := "ffmpeg"
	command_args := []string{
		"-probesize", "500",
		"-i", "pipe:0",
		"-c:a", "libopus",
		"-c:v", "vp9", 
			"-quality", "realtime", 
			"-speed", "7", 
			"-tile-columns", "4", 
			"-frame-parallel", "1", 
			"-threads", "8",
		"-b:v", "1M",
		"-g", "30",
		"-hls_time", "6",
		"-hls_list_size", "4",
		"-hls_base_url", "/vid/" + stream_key + "/",
		"-hls_segment_type", "fmp4",
		"-hls_flags", "delete_segments",
		"-hls_flags", "+program_date_time",
		"stream.m3u8",
	}
	transcoder := exec.Command(command, command_args...)
	transcoder.Dir = base_dir + "/live/" + stream_key + "/"
	data_in, err := transcoder.StdinPipe()
	if err != nil {
		return nil, err
	}
	transcoder.Start()
	return data_in, nil
}