diff --git a/src/trigger/parser.js b/src/trigger/parser.js
index e0a1571..c16d6b6 100644
--- a/src/trigger/parser.js
+++ b/src/trigger/parser.js
@@ -81,7 +81,7 @@ module.exports = (lib) => {
                 //var dlformat = (m4a?'audioonly':'webm');
                 var dlformat;
                 if(m4a)
-                  dlformat = 'audioonly';
+                  dlformat = { filter: 'audioonly' };
                 else
                   dlformat = { filter: (format) => { return format.container === 'webm'; } };
                 
@@ -91,8 +91,8 @@ module.exports = (lib) => {
                       info = {
                         type: 'youtube',
                         title: title,
-                        mime: m4a?'audio/mp4':'video/webm',
-                        ext: m4a?'m4a':'webm',
+                        mime: (m4a?'audio/mp4':'video/webm'),
+                        ext: (m4a?'m4a':'webm'),
                         thumb: iurl
                       };
                     }