1.测试一下音频淡出效果

@@ -71,8 +71,8 @@ class AdminMakeImmerse implements ShouldQueue
                 $cmd = $this->ffmpeg .
                     ' -y -i ' . escapeshellarg($file) .
                     ' -y -i ' . escapeshellarg($bgm) .
-                    ' -filter_complex amix=inputs=2:duration=first:dropout_transition=2 ' .
-                    '-ar 48000 -ab 64k  ' . escapeshellarg($audio);
+                    ' -filter_complex amix=inputs=2:duration=first:dropout_transition=2;afade=t=out:st=33:d=5 ' .
+                    ' -ar 48000 -ab 64k  ' . escapeshellarg($audio);
                 if (!$this->execCmd($cmd)) return;
 
                 $audio_input = ' -i ' . escapeshellarg($audio);