Haven't investigated this yet, but it's causing crashes:
Crashes in the logs: 16/12 12:43:51  - error: [4572/29722] TypeError: Cannot read property 'duration' of undefined at /usr/src/app/node_modules/nodebb-plugin-youtube-embed/library.js:89:...
≤!-- 6ab865b7-1b48-403b-b126-25fe3e0a8fa6 --≥
…ails, which holds the duration. There is now some logging of the problem and a request for users to contact an administrator. Fixes Issue #4.
Version bumped to 0.6.5. Paging @ben_lubar.
This was the video causing the problems:
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