Add nixxquality's fixes

[josephrocca]

See: #332 (comment)

[w3cbot]

tidoust marked as non substantive for IPR from ash-nazg.

[josephrocca]

Copying a recent comment from nixxquality here for context:

Don't get me wrong, my solution is definitely not proper and I wouldn't recommend it.
It's merely replacing one non-standard hack that only works in some cases with another non-standard hack that only works in some media players.
The real solution would be fixing the cue writing.

Please feel free to close if these fixes are not deemed worth it RE the above comment - I probably should have separated the two fixes, since it's really only the cue writing one that's potentially problematic.

[dalecurtis]

Don't have plans to replace with mp4box.js anytime soon so just going to land this for now.