From MDN Web Platform Experimental Features, It seems that it is possible to control a dual audio video's Audio Track Selection using javascript by enabling the flag. 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 video's file size or video encoding? I'm sure that both of the video are dual audio. Here is a Fiddle: https://jsfiddle.net/u9f2x5wj/
And Here are Some Images:
