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A comment on Japan issues tsunami warning after magnitude 7.3 earthquake. Parent comment

Re:Japan issues tsunami warning after magnitude 7.3 earthquake by atomwaffel on Monday November 21, 2016 @06:19PM (#13010226)
I was also quite amazed to see that they have closed captions for the simultaneous translation of their live domestic broadcast. Besides the sheer logistics of it, I didn't even know that you could do that with HTML video.
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Re:Japan issues tsunami warning after magnitude 7.3 earthquake by vdnkh on Monday November 21, 2016 @06:50PM (#13010399)
It's an HLS video, which comes in the form of a text manifest file (.m3u8). The manifest file can define subtitle segments (.vtt, 608, 708) in addition to video segments (.ts) - it's the job of the video player to stitch these together to play at the same time. Safari & Edge have their own HLS implementations but every other browser uses a third party library. Server-side transcoding is responsible for making these manifest files from video & subtitle files.

Also, this video is in Flash

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Re:Japan issues tsunami warning after magnitude 7.3 earthquake by atomwaffel on Tuesday November 22, 2016 @03:07AM (#13012497)
Interesting, thanks! I had a quick peek at the developer tools but didn't delve more deeply. I assume (from the fact that it was live TV) that all of this can be done just in time as well and that the stream of captions is sent along with the video stream.

> Also, this video is in Flash

Not for me. I was watching in Safari on my phone.

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