How to make screenshots?

[iLeonidze]

I want my app automatically capture over 10-20 random screenshots from the mp4 video in the torrent, without downloading it, but I can't find this feauture in the API.

[DiegoRBaquero]

Without downloading it? It's impossible. You can select the 10-20 random parts to screenshots selecting 10-20 random pieces, but those will definitely be downloaded.

This feature is not part of a torrent client function, must be built on top of it. Would be great that if you find it or build it, that you shared it with us :)

[iLeonidze]

@DiegoRBaquero I incorrectly explained my idea - yes, I have to download this pieces, but I don't want to download full videofile. For example, in WebTorrent, when we start downaloding some video, we can see preview in main menu. So by this way I want to get "screenshots".

[feross]

@iLeonidze You can see the code for how we do this in WebTorrent Desktop here: https://github.com/feross/webtorrent-desktop/blob/64f49e4d4fa742d18809e54be3edd93d65055c39/src/renderer/lib/torrent-poster.js

We take advantage of the fact that we're running in a browser context (since it's an Electron app) to implement it simply. Basically, we add the video file to a <video> tag, then we seek to the part we want to screenshot and pull out the pixel data using a canvas. You can see that part here: https://github.com/feross/webtorrent-desktop/blob/64f49e4d4fa742d18809e54be3edd93d65055c39/src/renderer/lib/capture-video-frame.js

I plan to pull these out into their own npm packages so you can use them more easily.

[feross]

Here's one of them: capture-frame https://github.com/feross/capture-frame

[lock]

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