I am facing a strange issue. I can heard audio from youtube and other downloaded video files from my ubuntu. I have bought some courses from udemy. Surprisingly, there is no audio when I play those videos on my browser. I have changed the browser but no help. I even downloaded the video to my pc and play from that. Video is running but there is no audio! I don't understand what's the problem as other videos is running with audio.
This is the property of the video from where I am NOT getting any sound.
And This is the property of the video from where I am getting sound.
Note: videos from udemy is running correctly (with audio) at windows 10 in my other pc.
============== Update ===================
I found the problem! Cable of my headphone is so small that can't reach to my ear if I directly insert it at speaker port. That's why, I use an extension cable. But, with the cable I can't hear audio from udemy's video. Without cable, I can hear it. But, it's still strange as I can hear audio from other video's (except udemy's videos) with the extension cable! Any solution for it without changing the cable?