"Did you notice new Interactive Transcript feature that lets you scan quickly through full text of any owner-captioned video that you're watching on YouTube? For videos from I/O, that means you can quickly scan through a 60 minute talk to find the part of talk that you need to see. Or use your browser search with Interactive Transcript to find a mention of an API call, and then click on a word in the transcript to jump straight to that part of the video.
we caption every video that we post to Google developers. Last year, it took us months to get everything done. But, this year, we captioned everything within 24 hours or less with new auto-caption and auto-timing features in YouTube. The two fastest options for producing and cleaning up our captions used auto-timing: CART live real-time transcript + auto-timing, and Professional transcription + auto-timing," noted Google.