We are currently using Cobalt13.111497 version for our YouTube Playback. In this Cobalt version, when we try to play the video ID of '1w4zhAtBl3k' and 'Tqh-etL9ehu', optimal resolution has not been updated for Codec of VP9(242) & opus(251). For our checking, we have ommitted the VP9 by IsTypeSupported() and supported the IsTypeSupported() as H264 codec then optimal resolution has been updated as expected. Also we have observed the same issue behaviour in Google Chrome. Whether this issue is specific to this Cobalt version or problem in YouTube itself.
Problem was found and resolved. This issue occurred due to framewidth & frameheight was not updated. After updating that in client layer, Problem has been resolved