ffmpeg is now configured with a json file.

config.json

@@ -0,0 +1,5 @@
+{
+  "listen_at": "rtmp://192.168.254.146/",
+  "bitrate": "7M",
+  "send_to": "https://127.0.0.1:5001/"
+}

main.cpp

@@ -1,23 +1,39 @@
 #include <fmt/core.h>
+#include <nlohmann/json.hpp>
+#include <fstream>
 #include "dbc.hpp"
 
 #define BUF_MAX 1024 * 10
 using namespace fmt;
+using namespace nlohmann;
 
-const string TWITCH_BR="7M";
+FILE *run_ffmpeg(const string listen_at, const string bitrate, const string send_to) {
+  string ffmpeg_cmd = format("ffmpeg -listen 1 -i {} -bufsize 3000k  -maxrate {} -flags +global_header  -c:v libx264  -preset veryfast -tune zerolatency  -g:v 60  -vb {} -c:a copy -f flv {}",
+      listen_at, bitrate, bitrate, send_to);
 
-FILE *run_ffmpeg() {
-  string ffmpeg_cmd = format("ffmpeg -listen 1 -i rtmp://192.168.254.146/  -bufsize 3000k  -maxrate $twitch_br  -flags +global_header  -c:v libx264  -preset veryfast -tune zerolatency  -g:v 60  -vb $twitch_br  -c:a copy  -f flv $twitch");
+  println("RUNNING: {}", ffmpeg_cmd);
 
   FILE *handle = popen(ffmpeg_cmd.c_str(), "r");
   dbc::check(handle != nullptr, "failed to start ffmpeg");
   return handle;
 }
 
+json load_config(const string file_name) {
+  std::ifstream infile(file_name);
+  return json::parse(infile);
+}
+
 int main() {
-  FILE *handle = run_ffmpeg();
+  FILE *handle = nullptr;
   char buffer[BUF_MAX];
   char *res = nullptr;
+  json config = load_config("config.json");
+
+  const string listen_at = config["listen_at"].template get<string>();
+  const string bitrate = config["bitrate"].template get<string>();
+  const string send_to = config["send_to"].template get<string>();
+
+  handle = run_ffmpeg(listen_at, bitrate, send_to);
 
   do {
     res = fgets(buffer, BUF_MAX, handle);