diff --git a/app.js b/app.js
index 1308732..4281bd2 100644
--- a/app.js
+++ b/app.js
@@ -45,7 +45,7 @@ disk
     );
 
     daemon(
-      `ffmpeg -i rtmp://localhost:1935/live/bushitsuchan -hls_flags delete_segments -codec:v copy -g 40 -f hls ${mountPath}/output.m3u8`,
+      `ffmpeg -i rtmp://localhost:1935/live/bushitsuchan -hls_flags delete_segments -g 40 -f hls ${mountPath}/output.m3u8`,
     );
 
     let ngrokUrl;
diff --git a/utils.js b/utils.js
index 58ad52b..c8961a8 100644
--- a/utils.js
+++ b/utils.js
@@ -1,18 +1,23 @@
 const childProcess = require('child_process');
 const util = require('util');
+const fs = require('fs');
 
 const exec = util.promisify(childProcess.exec);
 
 const wait = ms => new Promise(reolve => setTimeout(() => reolve(), ms));
 
 module.exports.daemon = async (command, ms = 1000 * 10, maxCount = 100) => {
+  const logger = new console.Console(
+    fs.createWriteStream('out.log'),
+    fs.createWriteStream('err.log'),
+  );
   console.log(`start daemon ${command.slice(0, 40)}...`);
   for (let i = 0; i < maxCount; i += 1) {
     try {
       // eslint-disable-next-line no-await-in-loop
       await exec(command);
     } catch (e) {
-      console.error(e);
+      logger.error(e);
       // eslint-disable-next-line no-await-in-loop
       await wait(ms);
     }