From MDN Web Platform Experimental Features, It seems that it is possible to control a dual audio video’s Audio Track Selection using javascript. I enabled the chrome flag option and then tested with a 720p dual audio 20 minutes video. when I execute video.audioTracks, I see 2 audio tracks. But After that, If I try with a 2 hour 720p dual audio video, sometimes I see only 1 audio track and sometimes 0 audio tracks. What’s the problem here? Is there any problem with the video meta data or something? I’m sure that both of the video are dual audio. Here is a Fiddle: https://jsfiddle.net/dzx98no4/3/