[PLAYER] Investigate video.js background tab high CPU usage

[DispatchCommit]

Investigate video.js memory leak.

When bitwave tab is in background, RAF's are potentially queued and attempt to immediately all fire at once once tab regains focus. This causes a large amount of CPU usage and freezes the entire page until all RAF's have completed. The longer a page is in the background, the longer the wait will likely be.

Initial assumptions are that this had been fixed in 7.6.x, and re-introduced with 7.7.x

video.js issue being tracked: videojs/video.js#5937
Assumed to be the breaking PR: videojs/video.js#6155

Investigate and confirm functionality for 7.6.6 build compared to 7.7.0 build.

[DispatchCommit]

investigation branch: https://github.com/bitwave-tv/bitwave/tree/investigate/video-js

[DispatchCommit]

Top: 7.6.6
Bottom: 7.7.5

More details:

[DispatchCommit]

Here's a code profile comparison, v7.7.5 is substantially slower upon tab focus compared to v.7.6.6, and it appears to be related to an anonymous function call that calls functions such as update, getCurrentTime, duration, seekableEnd, and liveWindow which make me think my previous suspicions are correct.

Next step may be to fork 7.6.6 and revert the PR linked above and compare.

[DispatchCommit]

Submitted PR with fix: videojs/video.js#6621

[DispatchCommit]

Install temporary dev package with npm install video.js@github:bitwave-tv/video.js#dev
Current version will report 7.8.2

[DispatchCommit]

published on npm, install with: npm install video.js@npm:@bitwave/video.js to avoid issues.