diff --git a/.env.template b/.env.template
index d0ded1a8..4962cb6a 100644
--- a/.env.template
+++ b/.env.template
@@ -107,4 +107,8 @@ CHATGPT_BASE_PATH=https://api.openai.com/v1/
 CHATGTP_APIKEY=YourOpenAiApiKey
 CHATGPT_MODEL=text-davinci-003
 CHATGPT_MAX_TOKENS=1000
-CHATGPT_TEMPERATURE=0
\ No newline at end of file
+CHATGPT_TEMPERATURE=0
+
+# give priority to h264/aac when
+# recording screen
+PRIORITIZE_H264=false # true or false
\ No newline at end of file
diff --git a/app/src/server.js b/app/src/server.js
index 969ae91d..f4148e86 100755
--- a/app/src/server.js
+++ b/app/src/server.js
@@ -206,6 +206,9 @@ if (configChatGPT.enabled) {
     }
 }
 
+// make sure we prioritize h264/aac when recording screen
+const isPrioritizeH264 = getEnvBoolean(process.env.PRIORITIZE_H264)
+
 // directory
 const dir = {
     public: path.join(__dirname, '../../', 'public'),
@@ -835,6 +838,7 @@ io.sockets.on('connect', async (socket) => {
                 active: redirectEnabled,
                 url: redirectURL,
             },
+	    is_prioritize_h264: isPrioritizeH264,
             //...
         });
     });
diff --git a/public/js/client.js b/public/js/client.js
index cabd9f76..91e55fcc 100644
--- a/public/js/client.js
+++ b/public/js/client.js
@@ -496,6 +496,7 @@ let swBg = 'rgba(0, 0, 0, 0.7)'; // swAlert background color
 let callElapsedTime; // count time
 let mySessionTime; // conference session time
 let isDocumentOnFullScreen = false;
+let isPrioritizeH264 = false;
 
 // peer
 let myPeerId; // This socket.id
@@ -1126,7 +1127,7 @@ async function handleConnect() {
 function handleServerInfo(config) {
     console.log('13. Server info', config);
 
-    const { peers_count, host_protected, user_auth, is_presenter, survey, redirect } = config;
+    const { peers_count, host_protected, user_auth, is_presenter, survey, redirect, is_prioritize_h264 } = config;
 
     isHostProtected = host_protected;
     isPeerAuthEnabled = user_auth;
@@ -1147,6 +1148,9 @@ function handleServerInfo(config) {
     isPresenter = isPeerReconnected ? isPresenter : is_presenter;
     isPeerPresenter.innerText = isPresenter;
 
+    // prioritize h264
+    isPrioritizeH264 = is_prioritize_h264;
+
     if (isRulesActive) {
         handleRules(isPresenter);
     }
@@ -5745,10 +5749,14 @@ function getSupportedMimeTypes() {
     const possibleTypes = [
         'video/webm;codecs=vp9,opus',
         'video/webm;codecs=vp8,opus',
-        'video/webm;codecs=h264,opus',
-        'video/mp4;codecs=h264,aac',
         'video/mp4',
     ];
+    possibleTypes.splice(
+        isPrioritizeH264 ? 0 : 2,
+        0,
+        'video/mp4;codecs=h264,aac',
+        'video/webm;codecs=h264,opus'
+    );
     return possibleTypes.filter((mimeType) => {
         return MediaRecorder.isTypeSupported(mimeType);
     });