Blender audio and video

Worked through grease pencil tutorial.
https://cgi.tutsplus.com/tutorials/how-to-scribble-over-a-video-in-blender--cms-25228

Used openGL to render to a video....
When rendering final result with audio.....
Went to video sequence editor, inserted the rendered video and an mp3.
To render it used H.264 as output. This allowed me to set the audio codec to mp3 and it worked fine.